Update linux-x86 Go prebuilts from ab/7064006 am: 0f0f207a3a am: 513c0a9b9d am: 796a507eb8

Original change: https://android-review.googlesource.com/c/platform/prebuilts/go/linux-x86/+/1541487

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I2cc43dc5482b7c037285c886cc7b137727bc9d21
diff --git a/VERSION b/VERSION
index 93c7b2d..ea3b51f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-go1.15.3
+go1.15.6
\ No newline at end of file
diff --git a/bin/go b/bin/go
index 0f04049..94dd632 100755
--- a/bin/go
+++ b/bin/go
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diff --git a/bin/gofmt b/bin/gofmt
index f842d61..2c02aa2 100755
--- a/bin/gofmt
+++ b/bin/gofmt
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diff --git a/misc/cgo/errors/badsym_test.go b/misc/cgo/errors/badsym_test.go
new file mode 100644
index 0000000..b2701bf
--- /dev/null
+++ b/misc/cgo/errors/badsym_test.go
@@ -0,0 +1,216 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package errorstest
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+	"unicode"
+)
+
+// A manually modified object file could pass unexpected characters
+// into the files generated by cgo.
+
+const magicInput = "abcdefghijklmnopqrstuvwxyz0123"
+const magicReplace = "\n//go:cgo_ldflag \"-badflag\"\n//"
+
+const cSymbol = "BadSymbol" + magicInput + "Name"
+const cDefSource = "int " + cSymbol + " = 1;"
+const cRefSource = "extern int " + cSymbol + "; int F() { return " + cSymbol + "; }"
+
+// goSource is the source code for the trivial Go file we use.
+// We will replace TMPDIR with the temporary directory name.
+const goSource = `
+package main
+
+// #cgo LDFLAGS: TMPDIR/cbad.o TMPDIR/cbad.so
+// extern int F();
+import "C"
+
+func main() {
+	println(C.F())
+}
+`
+
+func TestBadSymbol(t *testing.T) {
+	dir := t.TempDir()
+
+	mkdir := func(base string) string {
+		ret := filepath.Join(dir, base)
+		if err := os.Mkdir(ret, 0755); err != nil {
+			t.Fatal(err)
+		}
+		return ret
+	}
+
+	cdir := mkdir("c")
+	godir := mkdir("go")
+
+	makeFile := func(mdir, base, source string) string {
+		ret := filepath.Join(mdir, base)
+		if err := ioutil.WriteFile(ret, []byte(source), 0644); err != nil {
+			t.Fatal(err)
+		}
+		return ret
+	}
+
+	cDefFile := makeFile(cdir, "cdef.c", cDefSource)
+	cRefFile := makeFile(cdir, "cref.c", cRefSource)
+
+	ccCmd := cCompilerCmd(t)
+
+	cCompile := func(arg, base, src string) string {
+		out := filepath.Join(cdir, base)
+		run := append(ccCmd, arg, "-o", out, src)
+		output, err := exec.Command(run[0], run[1:]...).CombinedOutput()
+		if err != nil {
+			t.Log(run)
+			t.Logf("%s", output)
+			t.Fatal(err)
+		}
+		if err := os.Remove(src); err != nil {
+			t.Fatal(err)
+		}
+		return out
+	}
+
+	// Build a shared library that defines a symbol whose name
+	// contains magicInput.
+
+	cShared := cCompile("-shared", "c.so", cDefFile)
+
+	// Build an object file that refers to the symbol whose name
+	// contains magicInput.
+
+	cObj := cCompile("-c", "c.o", cRefFile)
+
+	// Rewrite the shared library and the object file, replacing
+	// magicInput with magicReplace. This will have the effect of
+	// introducing a symbol whose name looks like a cgo command.
+	// The cgo tool will use that name when it generates the
+	// _cgo_import.go file, thus smuggling a magic //go:cgo_ldflag
+	// pragma into a Go file. We used to not check the pragmas in
+	// _cgo_import.go.
+
+	rewrite := func(from, to string) {
+		obj, err := ioutil.ReadFile(from)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if bytes.Count(obj, []byte(magicInput)) == 0 {
+			t.Fatalf("%s: did not find magic string", from)
+		}
+
+		if len(magicInput) != len(magicReplace) {
+			t.Fatalf("internal test error: different magic lengths: %d != %d", len(magicInput), len(magicReplace))
+		}
+
+		obj = bytes.ReplaceAll(obj, []byte(magicInput), []byte(magicReplace))
+
+		if err := ioutil.WriteFile(to, obj, 0644); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	cBadShared := filepath.Join(godir, "cbad.so")
+	rewrite(cShared, cBadShared)
+
+	cBadObj := filepath.Join(godir, "cbad.o")
+	rewrite(cObj, cBadObj)
+
+	goSourceBadObject := strings.ReplaceAll(goSource, "TMPDIR", godir)
+	makeFile(godir, "go.go", goSourceBadObject)
+
+	makeFile(godir, "go.mod", "module badsym")
+
+	// Try to build our little package.
+	cmd := exec.Command("go", "build", "-ldflags=-v")
+	cmd.Dir = godir
+	output, err := cmd.CombinedOutput()
+
+	// The build should fail, but we want it to fail because we
+	// detected the error, not because we passed a bad flag to the
+	// C linker.
+
+	if err == nil {
+		t.Errorf("go build succeeded unexpectedly")
+	}
+
+	t.Logf("%s", output)
+
+	for _, line := range bytes.Split(output, []byte("\n")) {
+		if bytes.Contains(line, []byte("dynamic symbol")) && bytes.Contains(line, []byte("contains unsupported character")) {
+			// This is the error from cgo.
+			continue
+		}
+
+		// We passed -ldflags=-v to see the external linker invocation,
+		// which should not include -badflag.
+		if bytes.Contains(line, []byte("-badflag")) {
+			t.Error("output should not mention -badflag")
+		}
+
+		// Also check for compiler errors, just in case.
+		// GCC says "unrecognized command line option".
+		// clang says "unknown argument".
+		if bytes.Contains(line, []byte("unrecognized")) || bytes.Contains(output, []byte("unknown")) {
+			t.Error("problem should have been caught before invoking C linker")
+		}
+	}
+}
+
+func cCompilerCmd(t *testing.T) []string {
+	cc := []string{goEnv(t, "CC")}
+
+	out := goEnv(t, "GOGCCFLAGS")
+	quote := '\000'
+	start := 0
+	lastSpace := true
+	backslash := false
+	s := string(out)
+	for i, c := range s {
+		if quote == '\000' && unicode.IsSpace(c) {
+			if !lastSpace {
+				cc = append(cc, s[start:i])
+				lastSpace = true
+			}
+		} else {
+			if lastSpace {
+				start = i
+				lastSpace = false
+			}
+			if quote == '\000' && !backslash && (c == '"' || c == '\'') {
+				quote = c
+				backslash = false
+			} else if !backslash && quote == c {
+				quote = '\000'
+			} else if (quote == '\000' || quote == '"') && !backslash && c == '\\' {
+				backslash = true
+			} else {
+				backslash = false
+			}
+		}
+	}
+	if !lastSpace {
+		cc = append(cc, s[start:])
+	}
+	return cc
+}
+
+func goEnv(t *testing.T, key string) string {
+	out, err := exec.Command("go", "env", key).CombinedOutput()
+	if err != nil {
+		t.Logf("go env %s\n", key)
+		t.Logf("%s", out)
+		t.Fatal(err)
+	}
+	return strings.TrimSpace(string(out))
+}
diff --git a/pkg/linux_amd64/archive/tar.a b/pkg/linux_amd64/archive/tar.a
index 8655e64..c669d69 100644
--- a/pkg/linux_amd64/archive/tar.a
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diff --git a/pkg/linux_amd64/archive/zip.a b/pkg/linux_amd64/archive/zip.a
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diff --git a/pkg/linux_amd64/bufio.a b/pkg/linux_amd64/bufio.a
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diff --git a/pkg/linux_amd64/bytes.a b/pkg/linux_amd64/bytes.a
index 0eb7584..320823f 100644
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diff --git a/pkg/linux_amd64/cmd/asm/internal/arch.a b/pkg/linux_amd64/cmd/asm/internal/arch.a
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+++ b/pkg/linux_amd64_race/vendor/golang.org/x/net/http/httpproxy.a
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diff --git a/pkg/linux_amd64_race/vendor/golang.org/x/net/http2/hpack.a b/pkg/linux_amd64_race/vendor/golang.org/x/net/http2/hpack.a
index 12c31e3..978cd65 100644
--- a/pkg/linux_amd64_race/vendor/golang.org/x/net/http2/hpack.a
+++ b/pkg/linux_amd64_race/vendor/golang.org/x/net/http2/hpack.a
Binary files differ
diff --git a/pkg/linux_amd64_race/vendor/golang.org/x/net/idna.a b/pkg/linux_amd64_race/vendor/golang.org/x/net/idna.a
index 9015a09..04541e4 100644
--- a/pkg/linux_amd64_race/vendor/golang.org/x/net/idna.a
+++ b/pkg/linux_amd64_race/vendor/golang.org/x/net/idna.a
Binary files differ
diff --git a/pkg/linux_amd64_race/vendor/golang.org/x/net/nettest.a b/pkg/linux_amd64_race/vendor/golang.org/x/net/nettest.a
index 7298325..9873273 100644
--- a/pkg/linux_amd64_race/vendor/golang.org/x/net/nettest.a
+++ b/pkg/linux_amd64_race/vendor/golang.org/x/net/nettest.a
Binary files differ
diff --git a/pkg/linux_amd64_race/vendor/golang.org/x/sys/cpu.a b/pkg/linux_amd64_race/vendor/golang.org/x/sys/cpu.a
index d16a67e..7327ca5 100644
--- a/pkg/linux_amd64_race/vendor/golang.org/x/sys/cpu.a
+++ b/pkg/linux_amd64_race/vendor/golang.org/x/sys/cpu.a
Binary files differ
diff --git a/pkg/linux_amd64_race/vendor/golang.org/x/text/secure/bidirule.a b/pkg/linux_amd64_race/vendor/golang.org/x/text/secure/bidirule.a
index d043eca..dcab347 100644
--- a/pkg/linux_amd64_race/vendor/golang.org/x/text/secure/bidirule.a
+++ b/pkg/linux_amd64_race/vendor/golang.org/x/text/secure/bidirule.a
Binary files differ
diff --git a/pkg/linux_amd64_race/vendor/golang.org/x/text/transform.a b/pkg/linux_amd64_race/vendor/golang.org/x/text/transform.a
index c789939..5ca3698 100644
--- a/pkg/linux_amd64_race/vendor/golang.org/x/text/transform.a
+++ b/pkg/linux_amd64_race/vendor/golang.org/x/text/transform.a
Binary files differ
diff --git a/pkg/linux_amd64_race/vendor/golang.org/x/text/unicode/bidi.a b/pkg/linux_amd64_race/vendor/golang.org/x/text/unicode/bidi.a
index a24ad8e..074aabc 100644
--- a/pkg/linux_amd64_race/vendor/golang.org/x/text/unicode/bidi.a
+++ b/pkg/linux_amd64_race/vendor/golang.org/x/text/unicode/bidi.a
Binary files differ
diff --git a/pkg/linux_amd64_race/vendor/golang.org/x/text/unicode/norm.a b/pkg/linux_amd64_race/vendor/golang.org/x/text/unicode/norm.a
index 3d0bc82..bc43909 100644
--- a/pkg/linux_amd64_race/vendor/golang.org/x/text/unicode/norm.a
+++ b/pkg/linux_amd64_race/vendor/golang.org/x/text/unicode/norm.a
Binary files differ
diff --git a/pkg/tool/linux_amd64/addr2line b/pkg/tool/linux_amd64/addr2line
index 2cc2b26..1499391 100755
--- a/pkg/tool/linux_amd64/addr2line
+++ b/pkg/tool/linux_amd64/addr2line
Binary files differ
diff --git a/pkg/tool/linux_amd64/api b/pkg/tool/linux_amd64/api
index b86ae65..ecb7fda 100755
--- a/pkg/tool/linux_amd64/api
+++ b/pkg/tool/linux_amd64/api
Binary files differ
diff --git a/pkg/tool/linux_amd64/asm b/pkg/tool/linux_amd64/asm
index 773033e..0bffc00 100755
--- a/pkg/tool/linux_amd64/asm
+++ b/pkg/tool/linux_amd64/asm
Binary files differ
diff --git a/pkg/tool/linux_amd64/buildid b/pkg/tool/linux_amd64/buildid
index f8618a2..65fa78d 100755
--- a/pkg/tool/linux_amd64/buildid
+++ b/pkg/tool/linux_amd64/buildid
Binary files differ
diff --git a/pkg/tool/linux_amd64/cgo b/pkg/tool/linux_amd64/cgo
index b4c342a..884f7cb 100755
--- a/pkg/tool/linux_amd64/cgo
+++ b/pkg/tool/linux_amd64/cgo
Binary files differ
diff --git a/pkg/tool/linux_amd64/compile b/pkg/tool/linux_amd64/compile
index 210eeb3..d19d63c 100755
--- a/pkg/tool/linux_amd64/compile
+++ b/pkg/tool/linux_amd64/compile
Binary files differ
diff --git a/pkg/tool/linux_amd64/cover b/pkg/tool/linux_amd64/cover
index ecabce3..93869eb 100755
--- a/pkg/tool/linux_amd64/cover
+++ b/pkg/tool/linux_amd64/cover
Binary files differ
diff --git a/pkg/tool/linux_amd64/dist b/pkg/tool/linux_amd64/dist
index 4d31745..4db621d 100755
--- a/pkg/tool/linux_amd64/dist
+++ b/pkg/tool/linux_amd64/dist
Binary files differ
diff --git a/pkg/tool/linux_amd64/doc b/pkg/tool/linux_amd64/doc
index bdf3db9..b09a114 100755
--- a/pkg/tool/linux_amd64/doc
+++ b/pkg/tool/linux_amd64/doc
Binary files differ
diff --git a/pkg/tool/linux_amd64/fix b/pkg/tool/linux_amd64/fix
index 4d96d7d..898c14a 100755
--- a/pkg/tool/linux_amd64/fix
+++ b/pkg/tool/linux_amd64/fix
Binary files differ
diff --git a/pkg/tool/linux_amd64/link b/pkg/tool/linux_amd64/link
index 0c9eff5..1a31653 100755
--- a/pkg/tool/linux_amd64/link
+++ b/pkg/tool/linux_amd64/link
Binary files differ
diff --git a/pkg/tool/linux_amd64/nm b/pkg/tool/linux_amd64/nm
index 0af022d..337df6f 100755
--- a/pkg/tool/linux_amd64/nm
+++ b/pkg/tool/linux_amd64/nm
Binary files differ
diff --git a/pkg/tool/linux_amd64/objdump b/pkg/tool/linux_amd64/objdump
index f9c8cc7..d5a33fe 100755
--- a/pkg/tool/linux_amd64/objdump
+++ b/pkg/tool/linux_amd64/objdump
Binary files differ
diff --git a/pkg/tool/linux_amd64/oldlink b/pkg/tool/linux_amd64/oldlink
index 15cdff6..dcf8679 100755
--- a/pkg/tool/linux_amd64/oldlink
+++ b/pkg/tool/linux_amd64/oldlink
Binary files differ
diff --git a/pkg/tool/linux_amd64/pack b/pkg/tool/linux_amd64/pack
index dd3979a..674e1ea 100755
--- a/pkg/tool/linux_amd64/pack
+++ b/pkg/tool/linux_amd64/pack
Binary files differ
diff --git a/pkg/tool/linux_amd64/pprof b/pkg/tool/linux_amd64/pprof
index 2577458..dfda92f 100755
--- a/pkg/tool/linux_amd64/pprof
+++ b/pkg/tool/linux_amd64/pprof
Binary files differ
diff --git a/pkg/tool/linux_amd64/test2json b/pkg/tool/linux_amd64/test2json
index b868a97..f12187f 100755
--- a/pkg/tool/linux_amd64/test2json
+++ b/pkg/tool/linux_amd64/test2json
Binary files differ
diff --git a/pkg/tool/linux_amd64/trace b/pkg/tool/linux_amd64/trace
index a15c110..fca433b 100755
--- a/pkg/tool/linux_amd64/trace
+++ b/pkg/tool/linux_amd64/trace
Binary files differ
diff --git a/pkg/tool/linux_amd64/vet b/pkg/tool/linux_amd64/vet
index 8dd5212..7347e0a 100755
--- a/pkg/tool/linux_amd64/vet
+++ b/pkg/tool/linux_amd64/vet
Binary files differ
diff --git a/src/cmd/cgo/out.go b/src/cmd/cgo/out.go
index cbdb4e0..dcd69ed 100644
--- a/src/cmd/cgo/out.go
+++ b/src/cmd/cgo/out.go
@@ -336,6 +336,8 @@
 			if s.Version != "" {
 				targ += "#" + s.Version
 			}
+			checkImportSymName(s.Name)
+			checkImportSymName(targ)
 			fmt.Fprintf(stdout, "//go:cgo_import_dynamic %s %s %q\n", s.Name, targ, s.Library)
 		}
 		lib, _ := f.ImportedLibraries()
@@ -351,6 +353,7 @@
 			if len(s) > 0 && s[0] == '_' {
 				s = s[1:]
 			}
+			checkImportSymName(s)
 			fmt.Fprintf(stdout, "//go:cgo_import_dynamic %s %s %q\n", s, s, "")
 		}
 		lib, _ := f.ImportedLibraries()
@@ -365,6 +368,8 @@
 		for _, s := range sym {
 			ss := strings.Split(s, ":")
 			name := strings.Split(ss[0], "@")[0]
+			checkImportSymName(name)
+			checkImportSymName(ss[0])
 			fmt.Fprintf(stdout, "//go:cgo_import_dynamic %s %s %q\n", name, ss[0], strings.ToLower(ss[1]))
 		}
 		return
@@ -382,6 +387,7 @@
 				// Go symbols.
 				continue
 			}
+			checkImportSymName(s.Name)
 			fmt.Fprintf(stdout, "//go:cgo_import_dynamic %s %s %q\n", s.Name, s.Name, s.Library)
 		}
 		lib, err := f.ImportedLibraries()
@@ -397,6 +403,23 @@
 	fatalf("cannot parse %s as ELF, Mach-O, PE or XCOFF", obj)
 }
 
+// checkImportSymName checks a symbol name we are going to emit as part
+// of a //go:cgo_import_dynamic pragma. These names come from object
+// files, so they may be corrupt. We are going to emit them unquoted,
+// so while they don't need to be valid symbol names (and in some cases,
+// involving symbol versions, they won't be) they must contain only
+// graphic characters and must not contain Go comments.
+func checkImportSymName(s string) {
+	for _, c := range s {
+		if !unicode.IsGraphic(c) || unicode.IsSpace(c) {
+			fatalf("dynamic symbol %q contains unsupported character", s)
+		}
+	}
+	if strings.Index(s, "//") >= 0 || strings.Index(s, "/*") >= 0 {
+		fatalf("dynamic symbol %q contains Go comment")
+	}
+}
+
 // Construct a gcc struct matching the gc argument frame.
 // Assumes that in gcc, char is 1 byte, short 2 bytes, int 4 bytes, long long 8 bytes.
 // These assumptions are checked by the gccProlog.
diff --git a/src/cmd/compile/internal/gc/ssa.go b/src/cmd/compile/internal/gc/ssa.go
index 3e21450..7da0454 100644
--- a/src/cmd/compile/internal/gc/ssa.go
+++ b/src/cmd/compile/internal/gc/ssa.go
@@ -4976,7 +4976,10 @@
 	case t.IsBoolean() || t.IsInteger() || t.IsFloat() || t.IsComplex():
 		s.store(t, left, right)
 	case t.IsPtrShaped():
-		// no scalar fields.
+		if t.IsPtr() && t.Elem().NotInHeap() {
+			s.store(t, left, right) // see issue 42032
+		}
+		// otherwise, no scalar fields.
 	case t.IsString():
 		if skip&skipLen != 0 {
 			return
@@ -5020,6 +5023,9 @@
 func (s *state) storeTypePtrs(t *types.Type, left, right *ssa.Value) {
 	switch {
 	case t.IsPtrShaped():
+		if t.IsPtr() && t.Elem().NotInHeap() {
+			break // see issue 42032
+		}
 		s.store(t, left, right)
 	case t.IsString():
 		ptr := s.newValue1(ssa.OpStringPtr, s.f.Config.Types.BytePtr, right)
diff --git a/src/cmd/compile/internal/gc/subr.go b/src/cmd/compile/internal/gc/subr.go
index c82eefb..9118405 100644
--- a/src/cmd/compile/internal/gc/subr.go
+++ b/src/cmd/compile/internal/gc/subr.go
@@ -1876,8 +1876,10 @@
 	}
 
 	switch t.Etype {
-	case TPTR,
-		TCHAN,
+	case TPTR:
+		// Pointers to notinheap types must be stored indirectly. See issue 42076.
+		return !t.Elem().NotInHeap()
+	case TCHAN,
 		TMAP,
 		TFUNC,
 		TUNSAFEPTR:
diff --git a/src/cmd/compile/internal/gc/typecheck.go b/src/cmd/compile/internal/gc/typecheck.go
index 98b52a5..b187612 100644
--- a/src/cmd/compile/internal/gc/typecheck.go
+++ b/src/cmd/compile/internal/gc/typecheck.go
@@ -2502,7 +2502,7 @@
 				n.Left = nod(OADDR, n.Left, nil)
 				n.Left.SetImplicit(true)
 				n.Left = typecheck(n.Left, ctxType|ctxExpr)
-			} else if tt.IsPtr() && !rcvr.IsPtr() && types.Identical(tt.Elem(), rcvr) {
+			} else if tt.IsPtr() && (!rcvr.IsPtr() || rcvr.IsPtr() && rcvr.Elem().NotInHeap()) && types.Identical(tt.Elem(), rcvr) {
 				n.Left = nod(ODEREF, n.Left, nil)
 				n.Left.SetImplicit(true)
 				n.Left = typecheck(n.Left, ctxType|ctxExpr)
diff --git a/src/cmd/compile/internal/ssa/gen/AMD64.rules b/src/cmd/compile/internal/ssa/gen/AMD64.rules
index ee9ccfb..f7eb92d 100644
--- a/src/cmd/compile/internal/ssa/gen/AMD64.rules
+++ b/src/cmd/compile/internal/ssa/gen/AMD64.rules
@@ -1429,11 +1429,11 @@
 (NOTQ (MOVQconst [c])) -> (MOVQconst [^c])
 (NOTL (MOVLconst [c])) -> (MOVLconst [^c])
 (BTSQconst [c] (MOVQconst [d])) -> (MOVQconst [d|(1<<uint32(c))])
-(BTSLconst [c] (MOVLconst [d])) -> (MOVLconst [d|(1<<uint32(c))])
+(BTSLconst [c] (MOVLconst [d])) => (MOVLconst [d|(1<<uint32(c))])
 (BTRQconst [c] (MOVQconst [d])) -> (MOVQconst [d&^(1<<uint32(c))])
-(BTRLconst [c] (MOVLconst [d])) -> (MOVLconst [d&^(1<<uint32(c))])
+(BTRLconst [c] (MOVLconst [d])) => (MOVLconst [d&^(1<<uint32(c))])
 (BTCQconst [c] (MOVQconst [d])) -> (MOVQconst [d^(1<<uint32(c))])
-(BTCLconst [c] (MOVLconst [d])) -> (MOVLconst [d^(1<<uint32(c))])
+(BTCLconst [c] (MOVLconst [d])) => (MOVLconst [d^(1<<uint32(c))])
 
 // If c or d doesn't fit into 32 bits, then we can't construct ORQconst,
 // but we can still constant-fold.
diff --git a/src/cmd/compile/internal/ssa/rewriteAMD64.go b/src/cmd/compile/internal/ssa/rewriteAMD64.go
index 72ed1eb..e59fa20 100644
--- a/src/cmd/compile/internal/ssa/rewriteAMD64.go
+++ b/src/cmd/compile/internal/ssa/rewriteAMD64.go
@@ -3526,13 +3526,13 @@
 	// match: (BTCLconst [c] (MOVLconst [d]))
 	// result: (MOVLconst [d^(1<<uint32(c))])
 	for {
-		c := v.AuxInt
+		c := auxIntToInt8(v.AuxInt)
 		if v_0.Op != OpAMD64MOVLconst {
 			break
 		}
-		d := v_0.AuxInt
+		d := auxIntToInt32(v_0.AuxInt)
 		v.reset(OpAMD64MOVLconst)
-		v.AuxInt = d ^ (1 << uint32(c))
+		v.AuxInt = int32ToAuxInt(d ^ (1 << uint32(c)))
 		return true
 	}
 	return false
@@ -4010,13 +4010,13 @@
 	// match: (BTRLconst [c] (MOVLconst [d]))
 	// result: (MOVLconst [d&^(1<<uint32(c))])
 	for {
-		c := v.AuxInt
+		c := auxIntToInt8(v.AuxInt)
 		if v_0.Op != OpAMD64MOVLconst {
 			break
 		}
-		d := v_0.AuxInt
+		d := auxIntToInt32(v_0.AuxInt)
 		v.reset(OpAMD64MOVLconst)
-		v.AuxInt = d &^ (1 << uint32(c))
+		v.AuxInt = int32ToAuxInt(d &^ (1 << uint32(c)))
 		return true
 	}
 	return false
@@ -4356,13 +4356,13 @@
 	// match: (BTSLconst [c] (MOVLconst [d]))
 	// result: (MOVLconst [d|(1<<uint32(c))])
 	for {
-		c := v.AuxInt
+		c := auxIntToInt8(v.AuxInt)
 		if v_0.Op != OpAMD64MOVLconst {
 			break
 		}
-		d := v_0.AuxInt
+		d := auxIntToInt32(v_0.AuxInt)
 		v.reset(OpAMD64MOVLconst)
-		v.AuxInt = d | (1 << uint32(c))
+		v.AuxInt = int32ToAuxInt(d | (1 << uint32(c)))
 		return true
 	}
 	return false
diff --git a/src/cmd/go/internal/modfetch/coderepo_test.go b/src/cmd/go/internal/modfetch/coderepo_test.go
index f69c193..9a0cd7d 100644
--- a/src/cmd/go/internal/modfetch/coderepo_test.go
+++ b/src/cmd/go/internal/modfetch/coderepo_test.go
@@ -657,11 +657,6 @@
 	},
 	{
 		vcs:      "git",
-		path:     "gopkg.in/russross/blackfriday.v2",
-		versions: []string{"v2.0.0", "v2.0.1"},
-	},
-	{
-		vcs:      "git",
 		path:     "gopkg.in/natefinch/lumberjack.v2",
 		versions: []string{"v2.0.0"},
 	},
diff --git a/src/cmd/go/internal/work/exec.go b/src/cmd/go/internal/work/exec.go
index 071c9d2..dc0c4fc 100644
--- a/src/cmd/go/internal/work/exec.go
+++ b/src/cmd/go/internal/work/exec.go
@@ -2711,6 +2711,81 @@
 		noCompiler()
 	}
 
+	// Double check the //go:cgo_ldflag comments in the generated files.
+	// The compiler only permits such comments in files whose base name
+	// starts with "_cgo_". Make sure that the comments in those files
+	// are safe. This is a backstop against people somehow smuggling
+	// such a comment into a file generated by cgo.
+	if cfg.BuildToolchainName == "gc" && !cfg.BuildN {
+		var flags []string
+		for _, f := range outGo {
+			if !strings.HasPrefix(filepath.Base(f), "_cgo_") {
+				continue
+			}
+
+			src, err := ioutil.ReadFile(f)
+			if err != nil {
+				return nil, nil, err
+			}
+
+			const cgoLdflag = "//go:cgo_ldflag"
+			idx := bytes.Index(src, []byte(cgoLdflag))
+			for idx >= 0 {
+				// We are looking at //go:cgo_ldflag.
+				// Find start of line.
+				start := bytes.LastIndex(src[:idx], []byte("\n"))
+				if start == -1 {
+					start = 0
+				}
+
+				// Find end of line.
+				end := bytes.Index(src[idx:], []byte("\n"))
+				if end == -1 {
+					end = len(src)
+				} else {
+					end += idx
+				}
+
+				// Check for first line comment in line.
+				// We don't worry about /* */ comments,
+				// which normally won't appear in files
+				// generated by cgo.
+				commentStart := bytes.Index(src[start:], []byte("//"))
+				commentStart += start
+				// If that line comment is //go:cgo_ldflag,
+				// it's a match.
+				if bytes.HasPrefix(src[commentStart:], []byte(cgoLdflag)) {
+					// Pull out the flag, and unquote it.
+					// This is what the compiler does.
+					flag := string(src[idx+len(cgoLdflag) : end])
+					flag = strings.TrimSpace(flag)
+					flag = strings.Trim(flag, `"`)
+					flags = append(flags, flag)
+				}
+				src = src[end:]
+				idx = bytes.Index(src, []byte(cgoLdflag))
+			}
+		}
+
+		// We expect to find the contents of cgoLDFLAGS in flags.
+		if len(cgoLDFLAGS) > 0 {
+		outer:
+			for i := range flags {
+				for j, f := range cgoLDFLAGS {
+					if f != flags[i+j] {
+						continue outer
+					}
+				}
+				flags = append(flags[:i], flags[i+len(cgoLDFLAGS):]...)
+				break
+			}
+		}
+
+		if err := checkLinkerFlags("LDFLAGS", "go:cgo_ldflag", flags); err != nil {
+			return nil, nil, err
+		}
+	}
+
 	return outGo, outObj, nil
 }
 
diff --git a/src/cmd/go/internal/work/security.go b/src/cmd/go/internal/work/security.go
index 3ee68ac..0d96282 100644
--- a/src/cmd/go/internal/work/security.go
+++ b/src/cmd/go/internal/work/security.go
@@ -42,8 +42,8 @@
 var re = lazyregexp.New
 
 var validCompilerFlags = []*lazyregexp.Regexp{
-	re(`-D([A-Za-z_].*)`),
-	re(`-U([A-Za-z_]*)`),
+	re(`-D([A-Za-z_][A-Za-z0-9_]*)(=[^@\-]*)?`),
+	re(`-U([A-Za-z_][A-Za-z0-9_]*)`),
 	re(`-F([^@\-].*)`),
 	re(`-I([^@\-].*)`),
 	re(`-O`),
@@ -51,8 +51,8 @@
 	re(`-W`),
 	re(`-W([^@,]+)`), // -Wall but not -Wa,-foo.
 	re(`-Wa,-mbig-obj`),
-	re(`-Wp,-D([A-Za-z_].*)`),
-	re(`-Wp,-U([A-Za-z_]*)`),
+	re(`-Wp,-D([A-Za-z_][A-Za-z0-9_]*)(=[^@,\-]*)?`),
+	re(`-Wp,-U([A-Za-z_][A-Za-z0-9_]*)`),
 	re(`-ansi`),
 	re(`-f(no-)?asynchronous-unwind-tables`),
 	re(`-f(no-)?blocks`),
diff --git a/src/cmd/go/internal/work/security_test.go b/src/cmd/go/internal/work/security_test.go
index 11e74f2..aec9789 100644
--- a/src/cmd/go/internal/work/security_test.go
+++ b/src/cmd/go/internal/work/security_test.go
@@ -13,6 +13,7 @@
 	{"-DFOO"},
 	{"-Dfoo=bar"},
 	{"-Ufoo"},
+	{"-Ufoo1"},
 	{"-F/Qt"},
 	{"-I/"},
 	{"-I/etc/passwd"},
@@ -24,6 +25,8 @@
 	{"-Wall"},
 	{"-Wp,-Dfoo=bar"},
 	{"-Wp,-Ufoo"},
+	{"-Wp,-Dfoo1"},
+	{"-Wp,-Ufoo1"},
 	{"-fobjc-arc"},
 	{"-fno-objc-arc"},
 	{"-fomit-frame-pointer"},
@@ -78,6 +81,8 @@
 	{"-O@1"},
 	{"-Wa,-foo"},
 	{"-W@foo"},
+	{"-Wp,-DX,-D@X"},
+	{"-Wp,-UX,-U@X"},
 	{"-g@gdb"},
 	{"-g-gdb"},
 	{"-march=@dawn"},
diff --git a/src/cmd/go/testdata/script/ldflag.txt b/src/cmd/go/testdata/script/ldflag.txt
new file mode 100644
index 0000000..6ceb33b
--- /dev/null
+++ b/src/cmd/go/testdata/script/ldflag.txt
@@ -0,0 +1,44 @@
+# Issue #42565
+
+[!cgo] skip
+
+# We can't build package bad, which uses #cgo LDFLAGS.
+cd bad
+! go build
+stderr no-such-warning
+
+# We can build package ok with the same flags in CGO_LDFLAGS.
+env CGO_LDFLAGS=-Wno-such-warning -Wno-unknown-warning-option
+cd ../ok
+go build
+
+# Build a main program that actually uses LDFLAGS.
+cd ..
+go build -ldflags=-v
+
+# Because we passed -v the Go linker should print the external linker
+# command which should include the flag we passed in CGO_LDFLAGS.
+stderr no-such-warning
+
+-- go.mod --
+module ldflag
+
+-- bad/bad.go --
+package bad
+
+// #cgo LDFLAGS: -Wno-such-warning -Wno-unknown-warning
+import "C"
+
+func F() {}
+-- ok/ok.go --
+package ok
+
+import "C"
+
+func F() {}
+-- main.go --
+package main
+
+import _ "ldflag/ok"
+
+func main() {}
diff --git a/src/cmd/internal/obj/dwarf.go b/src/cmd/internal/obj/dwarf.go
index 4118c64..8a12849 100644
--- a/src/cmd/internal/obj/dwarf.go
+++ b/src/cmd/internal/obj/dwarf.go
@@ -44,14 +44,12 @@
 		}
 	}
 
-	// Set up the debug_lines state machine.
-	// NB: This state machine is reset to this state when we've finished
-	// generating the line table. See below.
-	// TODO: Once delve can support multiple DW_LNS_end_statements, we don't have
-	// to do this.
+	// Set up the debug_lines state machine to the default values
+	// we expect at the start of a new sequence.
 	stmt := true
 	line := int64(1)
 	pc := s.Func.Text.Pc
+	var lastpc int64 // last PC written to line table, not last PC in func
 	name := ""
 	prologue, wrotePrologue := false, false
 	// Walk the progs, generating the DWARF table.
@@ -86,30 +84,33 @@
 
 		if line != int64(newLine) || wrote {
 			pcdelta := p.Pc - pc
+			lastpc = p.Pc
 			putpclcdelta(ctxt, dctxt, lines, uint64(pcdelta), int64(newLine)-line)
 			line, pc = int64(newLine), p.Pc
 		}
 	}
 
-	// Because these symbols will be concatenated together by the linker, we need
-	// to reset the state machine that controls the debug symbols. The fields in
-	// the state machine that need to be reset are:
-	//   file = 1
-	//   line = 1
-	//   column = 0
-	//   stmt = set in header, we assume true
-	//   basic_block = false
-	// Careful readers of the DWARF specification will note that we don't reset
-	// the address of the state machine -- but this will happen at the beginning
-	// of the NEXT block of opcodes.
-	dctxt.AddUint8(lines, dwarf.DW_LNS_set_file)
+	// Because these symbols will be concatenated together by the
+	// linker, we need to reset the state machine that controls the
+	// debug symbols. Do this using an end-of-sequence operator.
+	//
+	// Note: at one point in time, Delve did not support multiple end
+	// sequence ops within a compilation unit (bug for this:
+	// https://github.com/go-delve/delve/issues/1694), however the bug
+	// has since been fixed (Oct 2019).
+	//
+	// Issue 38192: the DWARF standard specifies that when you issue
+	// an end-sequence op, the PC value should be one past the last
+	// text address in the translation unit, so apply a delta to the
+	// text address before the end sequence op. If this isn't done,
+	// GDB will assign a line number of zero the last row in the line
+	// table, which we don't want.
+	lastlen := uint64(s.Size - (lastpc - s.Func.Text.Pc))
+	dctxt.AddUint8(lines, dwarf.DW_LNS_advance_pc)
+	dwarf.Uleb128put(dctxt, lines, int64(lastlen))
+	dctxt.AddUint8(lines, 0) // start extended opcode
 	dwarf.Uleb128put(dctxt, lines, 1)
-	dctxt.AddUint8(lines, dwarf.DW_LNS_advance_line)
-	dwarf.Sleb128put(dctxt, lines, int64(1-line))
-	if !stmt {
-		dctxt.AddUint8(lines, dwarf.DW_LNS_negate_stmt)
-	}
-	dctxt.AddUint8(lines, dwarf.DW_LNS_copy)
+	dctxt.AddUint8(lines, dwarf.DW_LNE_end_sequence)
 }
 
 func putpclcdelta(linkctxt *Link, dctxt dwCtxt, s *LSym, deltaPC uint64, deltaLC int64) {
diff --git a/src/cmd/internal/objabi/zbootstrap.go b/src/cmd/internal/objabi/zbootstrap.go
index 0d4b6fb..8705614 100644
--- a/src/cmd/internal/objabi/zbootstrap.go
+++ b/src/cmd/internal/objabi/zbootstrap.go
@@ -13,6 +13,6 @@
 const defaultGOARCH = runtime.GOARCH
 const defaultGO_EXTLINK_ENABLED = ``
 const defaultGO_LDSO = ``
-const version = `go1.15.3`
+const version = `go1.15.6`
 const stackGuardMultiplierDefault = 1
 const goexperiment = ``
diff --git a/src/cmd/link/internal/ld/dwarf.go b/src/cmd/link/internal/ld/dwarf.go
index 8df03d7..6d33006 100644
--- a/src/cmd/link/internal/ld/dwarf.go
+++ b/src/cmd/link/internal/ld/dwarf.go
@@ -1264,22 +1264,6 @@
 		}
 	}
 
-	// Issue 38192: the DWARF standard specifies that when you issue
-	// an end-sequence op, the PC value should be one past the last
-	// text address in the translation unit, so apply a delta to the
-	// text address before the end sequence op. If this isn't done,
-	// GDB will assign a line number of zero the last row in the line
-	// table, which we don't want. The 1 + ptrsize amount is somewhat
-	// arbitrary, this is chosen to be consistent with the way LLVM
-	// emits its end sequence ops.
-	lsu.AddUint8(dwarf.DW_LNS_advance_pc)
-	dwarf.Uleb128put(d, lsDwsym, int64(1+d.arch.PtrSize))
-
-	// Emit an end-sequence at the end of the unit.
-	lsu.AddUint8(0) // start extended opcode
-	dwarf.Uleb128put(d, lsDwsym, 1)
-	lsu.AddUint8(dwarf.DW_LNE_end_sequence)
-
 	if d.linkctxt.HeadType == objabi.Haix {
 		saveDwsectCUSize(".debug_line", unit.Lib.Pkg, uint64(lsu.Size()-unitLengthOffset))
 	}
diff --git a/src/cmd/link/internal/ld/dwarf_test.go b/src/cmd/link/internal/ld/dwarf_test.go
index fb9c45b..f3dd537 100644
--- a/src/cmd/link/internal/ld/dwarf_test.go
+++ b/src/cmd/link/internal/ld/dwarf_test.go
@@ -1479,3 +1479,122 @@
 		t.Logf("row %d: A=%x F=%s L=%d\n", i, r.Address, r.File.Name, r.Line)
 	}
 }
+
+func TestIssue39757(t *testing.T) {
+	testenv.MustHaveGoBuild(t)
+
+	if runtime.GOOS == "plan9" {
+		t.Skip("skipping on plan9; no DWARF symbol table in executables")
+	}
+
+	// In this bug the DWARF line table contents for the last couple of
+	// instructions in a function were incorrect (bad file/line). This
+	// test verifies that all of the line table rows for a function
+	// of interest have the same file (no "autogenerated").
+	//
+	// Note: the function in this test was written with an eye towards
+	// ensuring that there are no inlined routines from other packages
+	// (which could introduce other source files into the DWARF); it's
+	// possible that at some point things could evolve in the
+	// compiler/runtime in ways that aren't happening now, so this
+	// might be something to check for if it does start failing.
+
+	tmpdir, err := ioutil.TempDir("", "TestIssue38192")
+	if err != nil {
+		t.Fatalf("could not create directory: %v", err)
+	}
+	defer os.RemoveAll(tmpdir)
+	wd, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("where am I? %v", err)
+	}
+	pdir := filepath.Join(wd, "testdata", "issue39757")
+	f := gobuildTestdata(t, tmpdir, pdir, DefaultOpt)
+
+	syms, err := f.Symbols()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var addr uint64
+	for _, sym := range syms {
+		if sym.Name == "main.main" {
+			addr = sym.Addr
+			break
+		}
+	}
+	if addr == 0 {
+		t.Fatal("cannot find main.main in symbols")
+	}
+
+	// Open the resulting binary and examine the DWARF it contains.
+	// Look for the function of interest ("main.main")
+	// and verify that all line table entries show the same source
+	// file.
+	dw, err := f.DWARF()
+	if err != nil {
+		t.Fatalf("error parsing DWARF: %v", err)
+	}
+	rdr := dw.Reader()
+	ex := examiner{}
+	if err := ex.populate(rdr); err != nil {
+		t.Fatalf("error reading DWARF: %v", err)
+	}
+
+	// Locate the main.main DIE
+	mains := ex.Named("main.main")
+	if len(mains) == 0 {
+		t.Fatalf("unable to locate DIE for main.main")
+	}
+	if len(mains) != 1 {
+		t.Fatalf("more than one main.main DIE")
+	}
+	maindie := mains[0]
+
+	// Collect the start/end PC for main.main
+	lowpc := maindie.Val(dwarf.AttrLowpc).(uint64)
+	highpc := maindie.Val(dwarf.AttrHighpc).(uint64)
+
+	// Now read the line table for the 'main' compilation unit.
+	mainIdx := ex.idxFromOffset(maindie.Offset)
+	cuentry := ex.Parent(mainIdx)
+	if cuentry == nil {
+		t.Fatalf("main.main DIE appears orphaned")
+	}
+	lnrdr, lerr := dw.LineReader(cuentry)
+	if lerr != nil {
+		t.Fatalf("error creating DWARF line reader: %v", err)
+	}
+	if lnrdr == nil {
+		t.Fatalf("no line table for main.main compilation unit")
+	}
+	rows := []dwarf.LineEntry{}
+	mainrows := 0
+	var lne dwarf.LineEntry
+	for {
+		err := lnrdr.Next(&lne)
+		if err == io.EOF {
+			break
+		}
+		rows = append(rows, lne)
+		if err != nil {
+			t.Fatalf("error reading next DWARF line: %v", err)
+		}
+		if lne.Address < lowpc || lne.Address > highpc {
+			continue
+		}
+		if !strings.HasSuffix(lne.File.Name, "issue39757main.go") {
+			t.Errorf("found row with file=%s (not issue39757main.go)", lne.File.Name)
+		}
+		mainrows++
+	}
+	f.Close()
+
+	// Make sure we saw a few rows.
+	if mainrows < 3 {
+		t.Errorf("not enough line table rows for main.main (got %d, wanted > 3", mainrows)
+		for i, r := range rows {
+			t.Logf("row %d: A=%x F=%s L=%d\n", i, r.Address, r.File.Name, r.Line)
+		}
+	}
+}
diff --git a/src/cmd/link/internal/ld/outbuf.go b/src/cmd/link/internal/ld/outbuf.go
index 09162ae..7bc8954 100644
--- a/src/cmd/link/internal/ld/outbuf.go
+++ b/src/cmd/link/internal/ld/outbuf.go
@@ -187,7 +187,9 @@
 		// See if our heap would grow to be too large, and if so, copy it to the end
 		// of the mmapped area.
 		if heapLen > maxOutBufHeapLen && out.copyHeap() {
-			heapPos, heapLen, lenNeeded = 0, 0, lenToWrite
+			heapPos -= heapLen
+			lenNeeded = heapPos + lenToWrite
+			heapLen = 0
 		}
 		out.heap = append(out.heap, make([]byte, lenNeeded-heapLen)...)
 	}
diff --git a/src/cmd/link/internal/ld/testdata/issue39757/issue39757main.go b/src/cmd/link/internal/ld/testdata/issue39757/issue39757main.go
new file mode 100644
index 0000000..76e0ea1
--- /dev/null
+++ b/src/cmd/link/internal/ld/testdata/issue39757/issue39757main.go
@@ -0,0 +1,15 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+var G int
+
+func main() {
+	if G != 101 {
+		println("not 101")
+	} else {
+		println("well now that's interesting")
+	}
+}
diff --git a/src/compress/flate/deflate_test.go b/src/compress/flate/deflate_test.go
index 49a0345..b19cbec 100644
--- a/src/compress/flate/deflate_test.go
+++ b/src/compress/flate/deflate_test.go
@@ -11,6 +11,7 @@
 	"internal/testenv"
 	"io"
 	"io/ioutil"
+	"math/rand"
 	"reflect"
 	"runtime/debug"
 	"sync"
@@ -896,6 +897,62 @@
 	}
 }
 
+func TestBestSpeedShiftOffsets(t *testing.T) {
+	// Test if shiftoffsets properly preserves matches and resets out-of-range matches
+	// seen in https://github.com/golang/go/issues/4142
+	enc := newDeflateFast()
+
+	// testData may not generate internal matches.
+	testData := make([]byte, 32)
+	rng := rand.New(rand.NewSource(0))
+	for i := range testData {
+		testData[i] = byte(rng.Uint32())
+	}
+
+	// Encode the testdata with clean state.
+	// Second part should pick up matches from the first block.
+	wantFirstTokens := len(enc.encode(nil, testData))
+	wantSecondTokens := len(enc.encode(nil, testData))
+
+	if wantFirstTokens <= wantSecondTokens {
+		t.Fatalf("test needs matches between inputs to be generated")
+	}
+	// Forward the current indicator to before wraparound.
+	enc.cur = bufferReset - int32(len(testData))
+
+	// Part 1 before wrap, should match clean state.
+	got := len(enc.encode(nil, testData))
+	if wantFirstTokens != got {
+		t.Errorf("got %d, want %d tokens", got, wantFirstTokens)
+	}
+
+	// Verify we are about to wrap.
+	if enc.cur != bufferReset {
+		t.Errorf("got %d, want e.cur to be at bufferReset (%d)", enc.cur, bufferReset)
+	}
+
+	// Part 2 should match clean state as well even if wrapped.
+	got = len(enc.encode(nil, testData))
+	if wantSecondTokens != got {
+		t.Errorf("got %d, want %d token", got, wantSecondTokens)
+	}
+
+	// Verify that we wrapped.
+	if enc.cur >= bufferReset {
+		t.Errorf("want e.cur to be < bufferReset (%d), got %d", bufferReset, enc.cur)
+	}
+
+	// Forward the current buffer, leaving the matches at the bottom.
+	enc.cur = bufferReset
+	enc.shiftOffsets()
+
+	// Ensure that no matches were picked up.
+	got = len(enc.encode(nil, testData))
+	if wantFirstTokens != got {
+		t.Errorf("got %d, want %d tokens", got, wantFirstTokens)
+	}
+}
+
 func TestMaxStackSize(t *testing.T) {
 	// This test must not run in parallel with other tests as debug.SetMaxStack
 	// affects all goroutines.
diff --git a/src/compress/flate/deflatefast.go b/src/compress/flate/deflatefast.go
index 24f8be9..6aa439f 100644
--- a/src/compress/flate/deflatefast.go
+++ b/src/compress/flate/deflatefast.go
@@ -270,6 +270,7 @@
 func (e *deflateFast) reset() {
 	e.prev = e.prev[:0]
 	// Bump the offset, so all matches will fail distance check.
+	// Nothing should be >= e.cur in the table.
 	e.cur += maxMatchOffset
 
 	// Protect against e.cur wraparound.
@@ -288,17 +289,21 @@
 		for i := range e.table[:] {
 			e.table[i] = tableEntry{}
 		}
-		e.cur = maxMatchOffset
+		e.cur = maxMatchOffset + 1
 		return
 	}
 
 	// Shift down everything in the table that isn't already too far away.
 	for i := range e.table[:] {
-		v := e.table[i].offset - e.cur + maxMatchOffset
+		v := e.table[i].offset - e.cur + maxMatchOffset + 1
 		if v < 0 {
+			// We want to reset e.cur to maxMatchOffset + 1, so we need to shift
+			// all table entries down by (e.cur - (maxMatchOffset + 1)).
+			// Because we ignore matches > maxMatchOffset, we can cap
+			// any negative offsets at 0.
 			v = 0
 		}
 		e.table[i].offset = v
 	}
-	e.cur = maxMatchOffset
+	e.cur = maxMatchOffset + 1
 }
diff --git a/src/go.mod b/src/go.mod
index b002f8e..6b97366 100644
--- a/src/go.mod
+++ b/src/go.mod
@@ -4,7 +4,7 @@
 
 require (
 	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
-	golang.org/x/net v0.0.0-20200707034311-ab3426394381
+	golang.org/x/net v0.0.0-20201008223702-a5fa9d4b7c91
 	golang.org/x/sys v0.0.0-20200501145240-bc7a7d42d5c3 // indirect
 	golang.org/x/text v0.3.3-0.20200430171850-afb9336c4530 // indirect
 )
diff --git a/src/go.sum b/src/go.sum
index 528f7e4..fbd3279 100644
--- a/src/go.sum
+++ b/src/go.sum
@@ -2,8 +2,8 @@
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 h1:psW17arqaxU48Z5kZ0CQnkZWQJsqcURM6tKiBApRjXI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20200707034311-ab3426394381 h1:VXak5I6aEWmAXeQjA+QSZzlgNrpq9mjcfDemuexIKsU=
-golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
+golang.org/x/net v0.0.0-20201008223702-a5fa9d4b7c91 h1:zd7kl5i5PDM0OnFbRWVM6B8mXojzv8LOkHN9LsOrRf4=
+golang.org/x/net v0.0.0-20201008223702-a5fa9d4b7c91/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
diff --git a/src/internal/poll/copy_file_range_linux.go b/src/internal/poll/copy_file_range_linux.go
index 09de299..fc34aef 100644
--- a/src/internal/poll/copy_file_range_linux.go
+++ b/src/internal/poll/copy_file_range_linux.go
@@ -10,15 +10,61 @@
 	"syscall"
 )
 
-var copyFileRangeSupported int32 = 1 // accessed atomically
+var copyFileRangeSupported int32 = -1 // accessed atomically
 
 const maxCopyFileRangeRound = 1 << 30
 
+func kernelVersion() (major int, minor int) {
+	var uname syscall.Utsname
+	if err := syscall.Uname(&uname); err != nil {
+		return
+	}
+
+	rl := uname.Release
+	var values [2]int
+	vi := 0
+	value := 0
+	for _, c := range rl {
+		if '0' <= c && c <= '9' {
+			value = (value * 10) + int(c-'0')
+		} else {
+			// Note that we're assuming N.N.N here.  If we see anything else we are likely to
+			// mis-parse it.
+			values[vi] = value
+			vi++
+			if vi >= len(values) {
+				break
+			}
+			value = 0
+		}
+	}
+	switch vi {
+	case 0:
+		return 0, 0
+	case 1:
+		return values[0], 0
+	case 2:
+		return values[0], values[1]
+	}
+	return
+}
+
 // CopyFileRange copies at most remain bytes of data from src to dst, using
 // the copy_file_range system call. dst and src must refer to regular files.
 func CopyFileRange(dst, src *FD, remain int64) (written int64, handled bool, err error) {
-	if atomic.LoadInt32(&copyFileRangeSupported) == 0 {
+	if supported := atomic.LoadInt32(&copyFileRangeSupported); supported == 0 {
 		return 0, false, nil
+	} else if supported == -1 {
+		major, minor := kernelVersion()
+		if major > 5 || (major == 5 && minor >= 3) {
+			atomic.StoreInt32(&copyFileRangeSupported, 1)
+		} else {
+			// copy_file_range(2) is broken in various ways on kernels older than 5.3,
+			// see issue #42400 and
+			// https://man7.org/linux/man-pages/man2/copy_file_range.2.html#VERSIONS
+			atomic.StoreInt32(&copyFileRangeSupported, 0)
+			return 0, false, nil
+		}
 	}
 	for remain > 0 {
 		max := remain
@@ -41,7 +87,7 @@
 			// use copy_file_range(2) again.
 			atomic.StoreInt32(&copyFileRangeSupported, 0)
 			return 0, false, nil
-		case syscall.EXDEV, syscall.EINVAL, syscall.EOPNOTSUPP, syscall.EPERM:
+		case syscall.EXDEV, syscall.EINVAL, syscall.EIO, syscall.EOPNOTSUPP, syscall.EPERM:
 			// Prior to Linux 5.3, it was not possible to
 			// copy_file_range across file systems. Similarly to
 			// the ENOSYS case above, if we see EXDEV, we have
@@ -53,6 +99,9 @@
 			// file. This is another case where no data has been
 			// transfered, so we consider it unhandled.
 			//
+			// If src and dst are on CIFS, we can see EIO.
+			// See issue #42334.
+			//
 			// If the file is on NFS, we can see EOPNOTSUPP.
 			// See issue #40731.
 			//
diff --git a/src/math/big/nat.go b/src/math/big/nat.go
index 6a3989b..8c43de6 100644
--- a/src/math/big/nat.go
+++ b/src/math/big/nat.go
@@ -928,7 +928,7 @@
 
 	// Now u < (v<<B), compute lower bits in the same way.
 	// Choose shift = B-1 again.
-	s := B
+	s := B - 1
 	qhat := *temps[depth]
 	qhat.clear()
 	qhat.divRecursiveStep(u[s:].norm(), v[s:], depth+1, tmp, temps)
diff --git a/src/net/http/h2_bundle.go b/src/net/http/h2_bundle.go
index 81c3671..b03b84d 100644
--- a/src/net/http/h2_bundle.go
+++ b/src/net/http/h2_bundle.go
@@ -5265,6 +5265,7 @@
 		if len(data) > 0 {
 			wrote, err := st.body.Write(data)
 			if err != nil {
+				sc.sendWindowUpdate(nil, int(f.Length)-wrote)
 				return http2streamError(id, http2ErrCodeStreamClosed)
 			}
 			if wrote != len(data) {
@@ -7167,6 +7168,7 @@
 	cc.inflow.add(http2transportDefaultConnFlow + http2initialWindowSize)
 	cc.bw.Flush()
 	if cc.werr != nil {
+		cc.Close()
 		return nil, cc.werr
 	}
 
@@ -7532,6 +7534,15 @@
 	bodyWriter := cc.t.getBodyWriterState(cs, body)
 	cs.on100 = bodyWriter.on100
 
+	defer func() {
+		cc.wmu.Lock()
+		werr := cc.werr
+		cc.wmu.Unlock()
+		if werr != nil {
+			cc.Close()
+		}
+	}()
+
 	cc.wmu.Lock()
 	endStream := !hasBody && !hasTrailers
 	werr := cc.writeHeaders(cs.ID, endStream, int(cc.maxFrameSize), hdrs)
diff --git a/src/net/http/request.go b/src/net/http/request.go
index fe6b609..54ec1c5 100644
--- a/src/net/http/request.go
+++ b/src/net/http/request.go
@@ -382,7 +382,7 @@
 	if s := r.TransferEncoding; s != nil {
 		s2 := make([]string, len(s))
 		copy(s2, s)
-		r2.TransferEncoding = s
+		r2.TransferEncoding = s2
 	}
 	r2.Form = cloneURLValues(r.Form)
 	r2.PostForm = cloneURLValues(r.PostForm)
diff --git a/src/net/http/request_test.go b/src/net/http/request_test.go
index 42c16d0..461d66e 100644
--- a/src/net/http/request_test.go
+++ b/src/net/http/request_test.go
@@ -828,6 +828,27 @@
 	}
 }
 
+// Ensure that Request.Clone creates a deep copy of TransferEncoding.
+// See issue 41907.
+func TestRequestCloneTransferEncoding(t *testing.T) {
+	body := strings.NewReader("body")
+	req, _ := NewRequest("POST", "https://example.org/", body)
+	req.TransferEncoding = []string{
+		"encoding1",
+	}
+
+	clonedReq := req.Clone(context.Background())
+	// modify original after deep copy
+	req.TransferEncoding[0] = "encoding2"
+
+	if req.TransferEncoding[0] != "encoding2" {
+		t.Error("expected req.TransferEncoding to be changed")
+	}
+	if clonedReq.TransferEncoding[0] != "encoding1" {
+		t.Error("expected clonedReq.TransferEncoding to be unchanged")
+	}
+}
+
 func TestNoPanicOnRoundTripWithBasicAuth_h1(t *testing.T) {
 	testNoPanicWithBasicAuth(t, h1Mode)
 }
diff --git a/src/reflect/deepequal.go b/src/reflect/deepequal.go
index 8a2bf8b..b99c345 100644
--- a/src/reflect/deepequal.go
+++ b/src/reflect/deepequal.go
@@ -37,7 +37,17 @@
 	// and it's safe and valid to get Value's internal pointer.
 	hard := func(v1, v2 Value) bool {
 		switch v1.Kind() {
-		case Map, Slice, Ptr, Interface:
+		case Ptr:
+			if v1.typ.ptrdata == 0 {
+				// go:notinheap pointers can't be cyclic.
+				// At least, all of our current uses of go:notinheap have
+				// that property. The runtime ones aren't cyclic (and we don't use
+				// DeepEqual on them anyway), and the cgo-generated ones are
+				// all empty structs.
+				return false
+			}
+			fallthrough
+		case Map, Slice, Interface:
 			// Nil pointers cannot be cyclic. Avoid putting them in the visited map.
 			return !v1.IsNil() && !v2.IsNil()
 		}
diff --git a/src/reflect/value.go b/src/reflect/value.go
index c6f24a5..1bd11c8 100644
--- a/src/reflect/value.go
+++ b/src/reflect/value.go
@@ -90,6 +90,7 @@
 
 // pointer returns the underlying pointer represented by v.
 // v.Kind() must be Ptr, Map, Chan, Func, or UnsafePointer
+// if v.Kind() == Ptr, the base type must not be go:notinheap.
 func (v Value) pointer() unsafe.Pointer {
 	if v.typ.size != ptrSize || !v.typ.pointers() {
 		panic("can't call pointer on a non-pointer Value")
@@ -1452,7 +1453,16 @@
 	// TODO: deprecate
 	k := v.kind()
 	switch k {
-	case Chan, Map, Ptr, UnsafePointer:
+	case Ptr:
+		if v.typ.ptrdata == 0 {
+			// Handle pointers to go:notinheap types directly,
+			// so we never materialize such pointers as an
+			// unsafe.Pointer. (Such pointers are always indirect.)
+			// See issue 42076.
+			return *(*uintptr)(v.ptr)
+		}
+		fallthrough
+	case Chan, Map, UnsafePointer:
 		return uintptr(v.pointer())
 	case Func:
 		if v.flag&flagMethod != 0 {
diff --git a/src/runtime/crash_cgo_test.go b/src/runtime/crash_cgo_test.go
index 4872189..57c3639 100644
--- a/src/runtime/crash_cgo_test.go
+++ b/src/runtime/crash_cgo_test.go
@@ -600,3 +600,16 @@
 		t.Fatalf("want %s, got %s\n", want, output)
 	}
 }
+
+// Issue #42207.
+func TestNeedmDeadlock(t *testing.T) {
+	switch runtime.GOOS {
+	case "plan9", "windows":
+		t.Skipf("no signals on %s", runtime.GOOS)
+	}
+	output := runTestProg(t, "testprogcgo", "NeedmDeadlock")
+	want := "OK\n"
+	if output != want {
+		t.Fatalf("want %s, got %s\n", want, output)
+	}
+}
diff --git a/src/runtime/internal/sys/zversion.go b/src/runtime/internal/sys/zversion.go
index b8d8371..bf4cb91 100644
--- a/src/runtime/internal/sys/zversion.go
+++ b/src/runtime/internal/sys/zversion.go
@@ -2,6 +2,6 @@
 
 package sys
 
-const TheVersion = `go1.15.3`
+const TheVersion = `go1.15.6`
 const Goexperiment = ``
 const StackGuardMultiplierDefault = 1
diff --git a/src/runtime/netpoll.go b/src/runtime/netpoll.go
index 34ea82a..77eb3aa 100644
--- a/src/runtime/netpoll.go
+++ b/src/runtime/netpoll.go
@@ -79,16 +79,17 @@
 	lock    mutex // protects the following fields
 	fd      uintptr
 	closing bool
-	everr   bool    // marks event scanning error happened
-	user    uint32  // user settable cookie
-	rseq    uintptr // protects from stale read timers
-	rg      uintptr // pdReady, pdWait, G waiting for read or nil
-	rt      timer   // read deadline timer (set if rt.f != nil)
-	rd      int64   // read deadline
-	wseq    uintptr // protects from stale write timers
-	wg      uintptr // pdReady, pdWait, G waiting for write or nil
-	wt      timer   // write deadline timer
-	wd      int64   // write deadline
+	everr   bool      // marks event scanning error happened
+	user    uint32    // user settable cookie
+	rseq    uintptr   // protects from stale read timers
+	rg      uintptr   // pdReady, pdWait, G waiting for read or nil
+	rt      timer     // read deadline timer (set if rt.f != nil)
+	rd      int64     // read deadline
+	wseq    uintptr   // protects from stale write timers
+	wg      uintptr   // pdReady, pdWait, G waiting for write or nil
+	wt      timer     // write deadline timer
+	wd      int64     // write deadline
+	self    *pollDesc // storage for indirect interface. See (*pollDesc).makeArg.
 }
 
 type pollCache struct {
@@ -157,6 +158,7 @@
 	pd.wseq++
 	pd.wg = 0
 	pd.wd = 0
+	pd.self = pd
 	unlock(&pd.lock)
 
 	var errno int32
@@ -271,14 +273,14 @@
 			// Copy current seq into the timer arg.
 			// Timer func will check the seq against current descriptor seq,
 			// if they differ the descriptor was reused or timers were reset.
-			pd.rt.arg = pd
+			pd.rt.arg = pd.makeArg()
 			pd.rt.seq = pd.rseq
 			resettimer(&pd.rt, pd.rd)
 		}
 	} else if pd.rd != rd0 || combo != combo0 {
 		pd.rseq++ // invalidate current timers
 		if pd.rd > 0 {
-			modtimer(&pd.rt, pd.rd, 0, rtf, pd, pd.rseq)
+			modtimer(&pd.rt, pd.rd, 0, rtf, pd.makeArg(), pd.rseq)
 		} else {
 			deltimer(&pd.rt)
 			pd.rt.f = nil
@@ -287,14 +289,14 @@
 	if pd.wt.f == nil {
 		if pd.wd > 0 && !combo {
 			pd.wt.f = netpollWriteDeadline
-			pd.wt.arg = pd
+			pd.wt.arg = pd.makeArg()
 			pd.wt.seq = pd.wseq
 			resettimer(&pd.wt, pd.wd)
 		}
 	} else if pd.wd != wd0 || combo != combo0 {
 		pd.wseq++ // invalidate current timers
 		if pd.wd > 0 && !combo {
-			modtimer(&pd.wt, pd.wd, 0, netpollWriteDeadline, pd, pd.wseq)
+			modtimer(&pd.wt, pd.wd, 0, netpollWriteDeadline, pd.makeArg(), pd.wseq)
 		} else {
 			deltimer(&pd.wt)
 			pd.wt.f = nil
@@ -547,3 +549,20 @@
 	unlock(&c.lock)
 	return pd
 }
+
+// makeArg converts pd to an interface{}.
+// makeArg does not do any allocation. Normally, such
+// a conversion requires an allocation because pointers to
+// go:notinheap types (which pollDesc is) must be stored
+// in interfaces indirectly. See issue 42076.
+func (pd *pollDesc) makeArg() (i interface{}) {
+	x := (*eface)(unsafe.Pointer(&i))
+	x._type = pdType
+	x.data = unsafe.Pointer(&pd.self)
+	return
+}
+
+var (
+	pdEface interface{} = (*pollDesc)(nil)
+	pdType  *_type      = efaceOf(&pdEface)._type
+)
diff --git a/src/runtime/os_js.go b/src/runtime/os_js.go
index ff0ee3a..94983b3 100644
--- a/src/runtime/os_js.go
+++ b/src/runtime/os_js.go
@@ -59,7 +59,7 @@
 }
 
 //go:nosplit
-func msigsave(mp *m) {
+func sigsave(p *sigset) {
 }
 
 //go:nosplit
diff --git a/src/runtime/os_plan9.go b/src/runtime/os_plan9.go
index 9e187d2..8f5380d 100644
--- a/src/runtime/os_plan9.go
+++ b/src/runtime/os_plan9.go
@@ -167,7 +167,7 @@
 	mp.errstr = (*byte)(mallocgc(_ERRMAX, nil, true))
 }
 
-func msigsave(mp *m) {
+func sigsave(p *sigset) {
 }
 
 func msigrestore(sigmask sigset) {
diff --git a/src/runtime/os_windows.go b/src/runtime/os_windows.go
index 769197d..81d9ccf 100644
--- a/src/runtime/os_windows.go
+++ b/src/runtime/os_windows.go
@@ -830,7 +830,7 @@
 }
 
 //go:nosplit
-func msigsave(mp *m) {
+func sigsave(p *sigset) {
 }
 
 //go:nosplit
diff --git a/src/runtime/proc.go b/src/runtime/proc.go
index 0358222..7fa19d8 100644
--- a/src/runtime/proc.go
+++ b/src/runtime/proc.go
@@ -569,7 +569,7 @@
 	typelinksinit() // uses maps, activeModules
 	itabsinit()     // uses activeModules
 
-	msigsave(_g_.m)
+	sigsave(&_g_.m.sigmask)
 	initSigmask = _g_.m.sigmask
 
 	goargs()
@@ -1281,6 +1281,14 @@
 	checkdead()
 	unlock(&sched.lock)
 
+	if GOOS == "darwin" {
+		// Make sure pendingPreemptSignals is correct when an M exits.
+		// For #41702.
+		if atomic.Load(&m.signalPending) != 0 {
+			atomic.Xadd(&pendingPreemptSignals, -1)
+		}
+	}
+
 	if osStack {
 		// Return from mstart and let the system thread
 		// library free the g0 stack and terminate the thread.
@@ -1528,6 +1536,18 @@
 		exit(1)
 	}
 
+	// Save and block signals before getting an M.
+	// The signal handler may call needm itself,
+	// and we must avoid a deadlock. Also, once g is installed,
+	// any incoming signals will try to execute,
+	// but we won't have the sigaltstack settings and other data
+	// set up appropriately until the end of minit, which will
+	// unblock the signals. This is the same dance as when
+	// starting a new m to run Go code via newosproc.
+	var sigmask sigset
+	sigsave(&sigmask)
+	sigblock()
+
 	// Lock extra list, take head, unlock popped list.
 	// nilokay=false is safe here because of the invariant above,
 	// that the extra list always contains or will soon contain
@@ -1545,14 +1565,8 @@
 	extraMCount--
 	unlockextra(mp.schedlink.ptr())
 
-	// Save and block signals before installing g.
-	// Once g is installed, any incoming signals will try to execute,
-	// but we won't have the sigaltstack settings and other data
-	// set up appropriately until the end of minit, which will
-	// unblock the signals. This is the same dance as when
-	// starting a new m to run Go code via newosproc.
-	msigsave(mp)
-	sigblock()
+	// Store the original signal mask for use by minit.
+	mp.sigmask = sigmask
 
 	// Install g (= m->g0) and set the stack bounds
 	// to match the current stack. We don't actually know
@@ -3409,7 +3423,7 @@
 	// a signal handler before exec if a signal is sent to the process
 	// group. See issue #18600.
 	gp.m.locks++
-	msigsave(gp.m)
+	sigsave(&gp.m.sigmask)
 	sigblock()
 
 	// This function is called before fork in syscall package.
@@ -3475,11 +3489,24 @@
 	inForkedChild = false
 }
 
+// pendingPreemptSignals is the number of preemption signals
+// that have been sent but not received. This is only used on Darwin.
+// For #41702.
+var pendingPreemptSignals uint32
+
 // Called from syscall package before Exec.
 //go:linkname syscall_runtime_BeforeExec syscall.runtime_BeforeExec
 func syscall_runtime_BeforeExec() {
 	// Prevent thread creation during exec.
 	execLock.lock()
+
+	// On Darwin, wait for all pending preemption signals to
+	// be received. See issue #41702.
+	if GOOS == "darwin" {
+		for int32(atomic.Load(&pendingPreemptSignals)) > 0 {
+			osyield()
+		}
+	}
 }
 
 // Called from syscall package after Exec.
diff --git a/src/runtime/signal_unix.go b/src/runtime/signal_unix.go
index dd6d79f..003c7b0 100644
--- a/src/runtime/signal_unix.go
+++ b/src/runtime/signal_unix.go
@@ -336,6 +336,10 @@
 	// Acknowledge the preemption.
 	atomic.Xadd(&gp.m.preemptGen, 1)
 	atomic.Store(&gp.m.signalPending, 0)
+
+	if GOOS == "darwin" {
+		atomic.Xadd(&pendingPreemptSignals, -1)
+	}
 }
 
 const preemptMSupported = true
@@ -357,7 +361,18 @@
 		// required).
 		return
 	}
+
+	// On Darwin, don't try to preempt threads during exec.
+	// Issue #41702.
+	if GOOS == "darwin" {
+		execLock.rlock()
+	}
+
 	if atomic.Cas(&mp.signalPending, 0, 1) {
+		if GOOS == "darwin" {
+			atomic.Xadd(&pendingPreemptSignals, 1)
+		}
+
 		// If multiple threads are preempting the same M, it may send many
 		// signals to the same M such that it hardly make progress, causing
 		// live-lock problem. Apparently this could happen on darwin. See
@@ -365,6 +380,10 @@
 		// Only send a signal if there isn't already one pending.
 		signalM(mp, sigPreempt)
 	}
+
+	if GOOS == "darwin" {
+		execLock.runlock()
+	}
 }
 
 // sigFetchG fetches the value of G safely when running in a signal handler.
@@ -425,6 +444,9 @@
 			// no non-Go signal handler for sigPreempt.
 			// The default behavior for sigPreempt is to ignore
 			// the signal, so badsignal will be a no-op anyway.
+			if GOOS == "darwin" {
+				atomic.Xadd(&pendingPreemptSignals, -1)
+			}
 			return
 		}
 		c.fixsigcode(sig)
@@ -1010,15 +1032,15 @@
 	return true
 }
 
-// msigsave saves the current thread's signal mask into mp.sigmask.
+// sigsave saves the current thread's signal mask into *p.
 // This is used to preserve the non-Go signal mask when a non-Go
 // thread calls a Go function.
 // This is nosplit and nowritebarrierrec because it is called by needm
 // which may be called on a non-Go thread with no g available.
 //go:nosplit
 //go:nowritebarrierrec
-func msigsave(mp *m) {
-	sigprocmask(_SIG_SETMASK, nil, &mp.sigmask)
+func sigsave(p *sigset) {
+	sigprocmask(_SIG_SETMASK, nil, p)
 }
 
 // msigrestore sets the current thread's signal mask to sigmask.
@@ -1090,7 +1112,7 @@
 // thread's signal mask. When this is called all signals have been
 // blocked for the thread.  This starts with m.sigmask, which was set
 // either from initSigmask for a newly created thread or by calling
-// msigsave if this is a non-Go thread calling a Go function. It
+// sigsave if this is a non-Go thread calling a Go function. It
 // removes all essential signals from the mask, thus causing those
 // signals to not be blocked. Then it sets the thread's signal mask.
 // After this is called the thread can receive signals.
diff --git a/src/runtime/testdata/testprogcgo/needmdeadlock.go b/src/runtime/testdata/testprogcgo/needmdeadlock.go
new file mode 100644
index 0000000..5a9c359
--- /dev/null
+++ b/src/runtime/testdata/testprogcgo/needmdeadlock.go
@@ -0,0 +1,95 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !plan9,!windows
+
+package main
+
+// This is for issue #42207.
+// During a call to needm we could get a SIGCHLD signal
+// which would itself call needm, causing a deadlock.
+
+/*
+#include <signal.h>
+#include <pthread.h>
+#include <sched.h>
+#include <unistd.h>
+
+extern void GoNeedM();
+
+#define SIGNALERS 10
+
+static void* needmSignalThread(void* p) {
+	pthread_t* pt = (pthread_t*)(p);
+	int i;
+
+	for (i = 0; i < 100; i++) {
+		if (pthread_kill(*pt, SIGCHLD) < 0) {
+			return NULL;
+		}
+		usleep(1);
+	}
+	return NULL;
+}
+
+// We don't need many calls, as the deadlock is only likely
+// to occur the first couple of times that needm is called.
+// After that there will likely be an extra M available.
+#define CALLS 10
+
+static void* needmCallbackThread(void* p) {
+	int i;
+
+	for (i = 0; i < SIGNALERS; i++) {
+		sched_yield(); // Help the signal threads get started.
+	}
+	for (i = 0; i < CALLS; i++) {
+		GoNeedM();
+	}
+	return NULL;
+}
+
+static void runNeedmSignalThread() {
+	int i;
+	pthread_t caller;
+	pthread_t s[SIGNALERS];
+
+	pthread_create(&caller, NULL, needmCallbackThread, NULL);
+	for (i = 0; i < SIGNALERS; i++) {
+		pthread_create(&s[i], NULL, needmSignalThread, &caller);
+	}
+	for (i = 0; i < SIGNALERS; i++) {
+		pthread_join(s[i], NULL);
+	}
+	pthread_join(caller, NULL);
+}
+*/
+import "C"
+
+import (
+	"fmt"
+	"os"
+	"time"
+)
+
+func init() {
+	register("NeedmDeadlock", NeedmDeadlock)
+}
+
+//export GoNeedM
+func GoNeedM() {
+}
+
+func NeedmDeadlock() {
+	// The failure symptom is that the program hangs because of a
+	// deadlock in needm, so set an alarm.
+	go func() {
+		time.Sleep(5 * time.Second)
+		fmt.Println("Hung for 5 seconds")
+		os.Exit(1)
+	}()
+
+	C.runNeedmSignalThread()
+	fmt.Println("OK")
+}
diff --git a/src/syscall/exec_unix_test.go b/src/syscall/exec_unix_test.go
index 4eb3c5c..4431f7f 100644
--- a/src/syscall/exec_unix_test.go
+++ b/src/syscall/exec_unix_test.go
@@ -9,11 +9,14 @@
 import (
 	"internal/testenv"
 	"io"
+	"math/rand"
 	"os"
 	"os/exec"
 	"os/signal"
+	"runtime"
 	"syscall"
 	"testing"
+	"time"
 	"unsafe"
 )
 
@@ -241,3 +244,46 @@
 		}
 	})
 }
+
+// TestExec is for issue #41702.
+func TestExec(t *testing.T) {
+	testenv.MustHaveExec(t)
+	cmd := exec.Command(os.Args[0], "-test.run=TestExecHelper")
+	cmd.Env = append(os.Environ(), "GO_WANT_HELPER_PROCESS=2")
+	o, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Errorf("%s\n%v", o, err)
+	}
+}
+
+// TestExecHelper is used by TestExec. It does nothing by itself.
+// In testing on macOS 10.14, this used to fail with
+// "signal: illegal instruction" more than half the time.
+func TestExecHelper(t *testing.T) {
+	if os.Getenv("GO_WANT_HELPER_PROCESS") != "2" {
+		return
+	}
+
+	// We don't have to worry about restoring these values.
+	// We are in a child process that only runs this test,
+	// and we are going to call syscall.Exec anyhow.
+	runtime.GOMAXPROCS(50)
+	os.Setenv("GO_WANT_HELPER_PROCESS", "3")
+
+	stop := time.Now().Add(time.Second)
+	for i := 0; i < 100; i++ {
+		go func(i int) {
+			r := rand.New(rand.NewSource(int64(i)))
+			for time.Now().Before(stop) {
+				r.Uint64()
+			}
+		}(i)
+	}
+
+	time.Sleep(10 * time.Millisecond)
+
+	argv := []string{os.Args[0], "-test.run=TestExecHelper"}
+	syscall.Exec(os.Args[0], argv, os.Environ())
+
+	t.Error("syscall.Exec returned")
+}
diff --git a/src/time/zoneinfo_read.go b/src/time/zoneinfo_read.go
index 6f789be..22a60f3 100644
--- a/src/time/zoneinfo_read.go
+++ b/src/time/zoneinfo_read.go
@@ -323,10 +323,27 @@
 		if tx[i].when <= sec && (i+1 == len(tx) || sec < tx[i+1].when) {
 			l.cacheStart = tx[i].when
 			l.cacheEnd = omega
+			zoneIdx := tx[i].index
 			if i+1 < len(tx) {
 				l.cacheEnd = tx[i+1].when
+			} else if l.extend != "" {
+				// If we're at the end of the known zone transitions,
+				// try the extend string.
+				if name, _, estart, eend, ok := tzset(l.extend, l.cacheEnd, sec); ok {
+					l.cacheStart = estart
+					l.cacheEnd = eend
+					// Find the zone that is returned by tzset,
+					// the last transition is not always the correct zone.
+					for i, z := range l.zone {
+						if z.name == name {
+							zoneIdx = uint8(i)
+							break
+						}
+					}
+				}
 			}
-			l.cacheZone = &l.zone[tx[i].index]
+			l.cacheZone = &l.zone[zoneIdx]
+			break
 		}
 	}
 
diff --git a/src/time/zoneinfo_test.go b/src/time/zoneinfo_test.go
index 72829bc..277b68f 100644
--- a/src/time/zoneinfo_test.go
+++ b/src/time/zoneinfo_test.go
@@ -183,6 +183,25 @@
 	}
 }
 
+func TestLoadLocationFromTZDataSlim(t *testing.T) {
+	// A 2020b slim tzdata for Europe/Berlin
+	tzData := "TZif2\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00TZif2\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00<\x00\x00\x00\x04\x00\x00\x00\x12\xff\xff\xff\xffo\xa2a\xf8\xff\xff\xff\xff\x9b\f\x17`\xff\xff\xff\xff\x9b\xd5\xda\xf0\xff\xff\xff\xff\x9cٮ\x90\xff\xff\xff\xff\x9d\xa4\xb5\x90\xff\xff\xff\xff\x9e\xb9\x90\x90\xff\xff\xff\xff\x9f\x84\x97\x90\xff\xff\xff\xff\xc8\tq\x90\xff\xff\xff\xff\xcc\xe7K\x10\xff\xff\xff\xffͩ\x17\x90\xff\xff\xff\xff\u03a2C\x10\xff\xff\xff\xffϒ4\x10\xff\xff\xff\xffЂ%\x10\xff\xff\xff\xff\xd1r\x16\x10\xff\xff\xff\xffѶ\x96\x00\xff\xff\xff\xff\xd2X\xbe\x80\xff\xff\xff\xffҡO\x10\xff\xff\xff\xff\xd3c\x1b\x90\xff\xff\xff\xff\xd4K#\x90\xff\xff\xff\xff\xd59\xd1 \xff\xff\xff\xff\xd5g\xe7\x90\xff\xff\xff\xffըs\x00\xff\xff\xff\xff\xd6)\xb4\x10\xff\xff\xff\xff\xd7,\x1a\x10\xff\xff\xff\xff\xd8\t\x96\x10\xff\xff\xff\xff\xd9\x02\xc1\x90\xff\xff\xff\xff\xd9\xe9x\x10\x00\x00\x00\x00\x13MD\x10\x00\x00\x00\x00\x143\xfa\x90\x00\x00\x00\x00\x15#\xeb\x90\x00\x00\x00\x00\x16\x13ܐ\x00\x00\x00\x00\x17\x03͐\x00\x00\x00\x00\x17\xf3\xbe\x90\x00\x00\x00\x00\x18㯐\x00\x00\x00\x00\x19Ӡ\x90\x00\x00\x00\x00\x1aÑ\x90\x00\x00\x00\x00\x1b\xbc\xbd\x10\x00\x00\x00\x00\x1c\xac\xae\x10\x00\x00\x00\x00\x1d\x9c\x9f\x10\x00\x00\x00\x00\x1e\x8c\x90\x10\x00\x00\x00\x00\x1f|\x81\x10\x00\x00\x00\x00 lr\x10\x00\x00\x00\x00!\\c\x10\x00\x00\x00\x00\"LT\x10\x00\x00\x00\x00#<E\x10\x00\x00\x00\x00$,6\x10\x00\x00\x00\x00%\x1c'\x10\x00\x00\x00\x00&\f\x18\x10\x00\x00\x00\x00'\x05C\x90\x00\x00\x00\x00'\xf54\x90\x00\x00\x00\x00(\xe5%\x90\x00\x00\x00\x00)\xd5\x16\x90\x00\x00\x00\x00*\xc5\a\x90\x00\x00\x00\x00+\xb4\xf8\x90\x00\x00\x00\x00,\xa4\xe9\x90\x00\x00\x00\x00-\x94ڐ\x00\x00\x00\x00.\x84ː\x00\x00\x00\x00/t\xbc\x90\x00\x00\x00\x000d\xad\x90\x00\x00\x00\x001]\xd9\x10\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x03\x01\x02\x01\x02\x01\x03\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x02\x01\x00\x00\f\x88\x00\x00\x00\x00\x1c \x01\x04\x00\x00\x0e\x10\x00\t\x00\x00*0\x01\rLMT\x00CEST\x00CET\x00CEMT\x00\nCET-1CEST,M3.5.0,M10.5.0/3\n"
+
+	reference, err := time.LoadLocationFromTZData("Europe/Berlin", []byte(tzData))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	d := time.Date(2020, time.October, 29, 15, 30, 0, 0, reference)
+	tzName, tzOffset := d.Zone()
+	if want := "CET"; tzName != want {
+		t.Errorf("Zone name == %s, want %s", tzName, want)
+	}
+	if want := 3600; tzOffset != want {
+		t.Errorf("Zone offset == %d, want %d", tzOffset, want)
+	}
+}
+
 func TestTzset(t *testing.T) {
 	for _, test := range []struct {
 		inStr string
diff --git a/src/vendor/modules.txt b/src/vendor/modules.txt
index e687d77..03ca3c3 100644
--- a/src/vendor/modules.txt
+++ b/src/vendor/modules.txt
@@ -8,7 +8,7 @@
 golang.org/x/crypto/hkdf
 golang.org/x/crypto/internal/subtle
 golang.org/x/crypto/poly1305
-# golang.org/x/net v0.0.0-20200707034311-ab3426394381
+# golang.org/x/net v0.0.0-20201008223702-a5fa9d4b7c91
 ## explicit
 golang.org/x/net/dns/dnsmessage
 golang.org/x/net/http/httpguts
diff --git a/test/fixedbugs/issue42032.go b/test/fixedbugs/issue42032.go
new file mode 100644
index 0000000..c456b1d
--- /dev/null
+++ b/test/fixedbugs/issue42032.go
@@ -0,0 +1,27 @@
+// run
+
+// Copyright 2020 The Go Authors. All rights reserved.  Use of this
+// source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+package main
+
+//go:notinheap
+type NIH struct {
+}
+
+type T struct {
+	x *NIH
+	p *int
+}
+
+var y NIH
+var z int
+
+func main() {
+	a := []T{{&y, &z}}
+	a = append(a, T{&y, &z})
+	if a[1].x == nil {
+		panic("pointer not written")
+	}
+}
diff --git a/test/fixedbugs/issue42076.go b/test/fixedbugs/issue42076.go
new file mode 100644
index 0000000..3e95481
--- /dev/null
+++ b/test/fixedbugs/issue42076.go
@@ -0,0 +1,21 @@
+// run
+
+// Copyright 2020 The Go Authors. All rights reserved.  Use of this
+// source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+package main
+
+import "reflect"
+
+//go:notinheap
+type NIH struct {
+}
+
+var x, y NIH
+
+func main() {
+	if reflect.DeepEqual(&x, &y) != true {
+		panic("should report true")
+	}
+}
diff --git a/test/fixedbugs/issue42753.go b/test/fixedbugs/issue42753.go
new file mode 100644
index 0000000..a998d1d
--- /dev/null
+++ b/test/fixedbugs/issue42753.go
@@ -0,0 +1,13 @@
+// compile -d=ssa/check/on
+
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+func f() uint32 {
+	s := "\x01"
+	x := -int32(s[0])
+	return uint32(x) & 0x7fffffff
+}