Merge github.com:grpc/grpc into error
diff --git a/src/core/ext/transport/chttp2/transport/chttp2_transport.c b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
index 7fd2b0b..872d5ea 100644
--- a/src/core/ext/transport/chttp2/transport/chttp2_transport.c
+++ b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
@@ -812,8 +812,10 @@
       gpr_log(GPR_DEBUG, "got goaway [%d]: %s", goaway_error, msg));
   gpr_slice_unref(goaway_text);
   transport_global->seen_goaway = 1;
+  /* lie: use transient failure from the transport to indicate goaway has been
+   * received */
   connectivity_state_set(
-      exec_ctx, transport_global, GRPC_CHANNEL_SHUTDOWN,
+      exec_ctx, transport_global, GRPC_CHANNEL_TRANSIENT_FAILURE,
       grpc_error_set_str(
           grpc_error_set_int(GRPC_ERROR_CREATE("GOAWAY received"),
                              GRPC_ERROR_INT_HTTP2_ERROR,
diff --git a/src/core/lib/channel/channel_stack.c b/src/core/lib/channel/channel_stack.c
index 5c16165..bbba85d 100644
--- a/src/core/lib/channel/channel_stack.c
+++ b/src/core/lib/channel/channel_stack.c
@@ -106,6 +106,7 @@
                              const grpc_channel_filter **filters,
                              size_t filter_count,
                              const grpc_channel_args *channel_args,
+                             grpc_transport *optional_transport,
                              const char *name, grpc_channel_stack *stack) {
   size_t call_size =
       ROUND_UP_TO_ALIGNMENT_SIZE(sizeof(grpc_call_stack)) +
@@ -127,6 +128,7 @@
   for (i = 0; i < filter_count; i++) {
     args.channel_stack = stack;
     args.channel_args = channel_args;
+    args.optional_transport = optional_transport;
     args.is_first = i == 0;
     args.is_last = i == (filter_count - 1);
     elems[i].filter = filters[i];
diff --git a/src/core/lib/channel/channel_stack.h b/src/core/lib/channel/channel_stack.h
index 3ca643c..41dd4a0 100644
--- a/src/core/lib/channel/channel_stack.h
+++ b/src/core/lib/channel/channel_stack.h
@@ -60,6 +60,8 @@
 typedef struct {
   grpc_channel_stack *channel_stack;
   const grpc_channel_args *channel_args;
+  /** Transport, iff it is known */
+  grpc_transport *optional_transport;
   int is_first;
   int is_last;
 } grpc_channel_element_args;
@@ -198,6 +200,7 @@
                              grpc_iomgr_cb_func destroy, void *destroy_arg,
                              const grpc_channel_filter **filters,
                              size_t filter_count, const grpc_channel_args *args,
+                             grpc_transport *optional_transport,
                              const char *name, grpc_channel_stack *stack);
 /* Destroy a channel stack */
 void grpc_channel_stack_destroy(grpc_exec_ctx *exec_ctx,
diff --git a/src/core/lib/channel/channel_stack_builder.c b/src/core/lib/channel/channel_stack_builder.c
index a8646c9..eda4968 100644
--- a/src/core/lib/channel/channel_stack_builder.c
+++ b/src/core/lib/channel/channel_stack_builder.c
@@ -257,8 +257,8 @@
   // and initialize it
   grpc_channel_stack_init(exec_ctx, initial_refs, destroy,
                           destroy_arg == NULL ? result : destroy_arg, filters,
-                          num_filters, builder->args, builder->name,
-                          channel_stack);
+                          num_filters, builder->args, builder->transport,
+                          builder->name, channel_stack);
 
   // run post-initialization functions
   i = 0;
diff --git a/src/core/lib/channel/http_client_filter.c b/src/core/lib/channel/http_client_filter.c
index afb738c..ab6c6c9 100644
--- a/src/core/lib/channel/http_client_filter.c
+++ b/src/core/lib/channel/http_client_filter.c
@@ -38,6 +38,7 @@
 #include "src/core/lib/profiling/timers.h"
 #include "src/core/lib/support/string.h"
 #include "src/core/lib/transport/static_metadata.h"
+#include "src/core/lib/transport/transport_impl.h"
 
 #define EXPECTED_CONTENT_TYPE "application/grpc"
 #define EXPECTED_CONTENT_TYPE_LENGTH sizeof(EXPECTED_CONTENT_TYPE) - 1
@@ -200,7 +201,8 @@
   return GRPC_MDELEM_SCHEME_HTTP;
 }
 
-static grpc_mdstr *user_agent_from_args(const grpc_channel_args *args) {
+static grpc_mdstr *user_agent_from_args(const grpc_channel_args *args,
+                                        const char *transport_name) {
   gpr_strvec v;
   size_t i;
   int is_first = 1;
@@ -222,8 +224,8 @@
     }
   }
 
-  gpr_asprintf(&tmp, "%sgrpc-c/%s (%s)", is_first ? "" : " ",
-               grpc_version_string(), GPR_PLATFORM_STRING);
+  gpr_asprintf(&tmp, "%sgrpc-c/%s (%s; %s)", is_first ? "" : " ",
+               grpc_version_string(), GPR_PLATFORM_STRING, transport_name);
   is_first = 0;
   gpr_strvec_add(&v, tmp);
 
@@ -254,9 +256,12 @@
                               grpc_channel_element_args *args) {
   channel_data *chand = elem->channel_data;
   GPR_ASSERT(!args->is_last);
+  GPR_ASSERT(args->optional_transport != NULL);
   chand->static_scheme = scheme_from_args(args->channel_args);
   chand->user_agent = grpc_mdelem_from_metadata_strings(
-      GRPC_MDSTR_USER_AGENT, user_agent_from_args(args->channel_args));
+      GRPC_MDSTR_USER_AGENT,
+      user_agent_from_args(args->channel_args,
+                           args->optional_transport->vtable->name));
 }
 
 /* Destructor for channel data */
diff --git a/src/core/lib/channel/http_client_filter.h b/src/core/lib/channel/http_client_filter.h
index a884b36..4708117 100644
--- a/src/core/lib/channel/http_client_filter.h
+++ b/src/core/lib/channel/http_client_filter.h
@@ -1,5 +1,4 @@
 /*
- *
  * Copyright 2015, Google Inc.
  * All rights reserved.
  *
@@ -39,6 +38,7 @@
 /* Processes metadata on the client side for HTTP2 transports */
 extern const grpc_channel_filter grpc_http_client_filter;
 
+/* Channel arg to override the http2 :scheme header */
 #define GRPC_ARG_HTTP2_SCHEME "grpc.http2_scheme"
 
 #endif /* GRPC_CORE_LIB_CHANNEL_HTTP_CLIENT_FILTER_H */
diff --git a/test/core/channel/channel_stack_test.c b/test/core/channel/channel_stack_test.c
index d540f6e..f9561be 100644
--- a/test/core/channel/channel_stack_test.c
+++ b/test/core/channel/channel_stack_test.c
@@ -125,7 +125,7 @@
 
   channel_stack = gpr_malloc(grpc_channel_stack_size(&filters, 1));
   grpc_channel_stack_init(&exec_ctx, 1, free_channel, channel_stack, &filters,
-                          1, &chan_args, "test", channel_stack);
+                          1, &chan_args, NULL, "test", channel_stack);
   GPR_ASSERT(channel_stack->count == 1);
   channel_elem = grpc_channel_stack_element(channel_stack, 0);
   channel_data = (int *)channel_elem->channel_data;
diff --git a/test/core/end2end/fuzzers/server_fuzzer_corpus/23f261e44d54a2736f6e288128d98db9e5015206 b/test/core/end2end/fuzzers/server_fuzzer_corpus/23f261e44d54a2736f6e288128d98db9e5015206
new file mode 100644
index 0000000..1452256
--- /dev/null
+++ b/test/core/end2end/fuzzers/server_fuzzer_corpus/23f261e44d54a2736f6e288128d98db9e5015206
Binary files differ
diff --git a/test/core/end2end/fuzzers/server_fuzzer_corpus/552199651d942e7220141a93ec33dd8256210a18 b/test/core/end2end/fuzzers/server_fuzzer_corpus/552199651d942e7220141a93ec33dd8256210a18
new file mode 100644
index 0000000..c8c54f4
--- /dev/null
+++ b/test/core/end2end/fuzzers/server_fuzzer_corpus/552199651d942e7220141a93ec33dd8256210a18
Binary files differ
diff --git a/test/core/end2end/fuzzers/server_fuzzer_corpus/7a946bf3cd91b63001f2cf3f40c515c747f2ecde b/test/core/end2end/fuzzers/server_fuzzer_corpus/7a946bf3cd91b63001f2cf3f40c515c747f2ecde
new file mode 100644
index 0000000..8ef1b0a
--- /dev/null
+++ b/test/core/end2end/fuzzers/server_fuzzer_corpus/7a946bf3cd91b63001f2cf3f40c515c747f2ecde
Binary files differ
diff --git a/test/core/end2end/fuzzers/server_fuzzer_corpus/7d25c28298fb4d0fe41209d0d14307e4aa67c59e b/test/core/end2end/fuzzers/server_fuzzer_corpus/7d25c28298fb4d0fe41209d0d14307e4aa67c59e
new file mode 100644
index 0000000..a323f7a
--- /dev/null
+++ b/test/core/end2end/fuzzers/server_fuzzer_corpus/7d25c28298fb4d0fe41209d0d14307e4aa67c59e
Binary files differ
diff --git a/test/core/end2end/fuzzers/server_fuzzer_corpus/8138b18a9a743659befc2f2b23d23cb9c3086a09 b/test/core/end2end/fuzzers/server_fuzzer_corpus/8138b18a9a743659befc2f2b23d23cb9c3086a09
new file mode 100644
index 0000000..2bcef17
--- /dev/null
+++ b/test/core/end2end/fuzzers/server_fuzzer_corpus/8138b18a9a743659befc2f2b23d23cb9c3086a09
Binary files differ
diff --git a/test/core/end2end/fuzzers/server_fuzzer_corpus/925011abb99fd56bb0f425ae5e0d92e6d341f804 b/test/core/end2end/fuzzers/server_fuzzer_corpus/925011abb99fd56bb0f425ae5e0d92e6d341f804
new file mode 100644
index 0000000..948d5fa
--- /dev/null
+++ b/test/core/end2end/fuzzers/server_fuzzer_corpus/925011abb99fd56bb0f425ae5e0d92e6d341f804
Binary files differ
diff --git a/test/core/end2end/fuzzers/server_fuzzer_corpus/crash-c1f66840627e3bfdedf2e4c225bc4de0c267ed37 b/test/core/end2end/fuzzers/server_fuzzer_corpus/crash-c1f66840627e3bfdedf2e4c225bc4de0c267ed37
new file mode 100644
index 0000000..a7fa57e
--- /dev/null
+++ b/test/core/end2end/fuzzers/server_fuzzer_corpus/crash-c1f66840627e3bfdedf2e4c225bc4de0c267ed37
Binary files differ
diff --git a/test/core/end2end/fuzzers/server_fuzzer_corpus/d6bed9cc3c10338a8c5f41064ff8bec0bbc267ce b/test/core/end2end/fuzzers/server_fuzzer_corpus/d6bed9cc3c10338a8c5f41064ff8bec0bbc267ce
new file mode 100644
index 0000000..2b3424a
--- /dev/null
+++ b/test/core/end2end/fuzzers/server_fuzzer_corpus/d6bed9cc3c10338a8c5f41064ff8bec0bbc267ce
Binary files differ
diff --git a/test/core/end2end/fuzzers/server_fuzzer_corpus/dda9643679f8c8b796e64232a7d153e447d64991 b/test/core/end2end/fuzzers/server_fuzzer_corpus/dda9643679f8c8b796e64232a7d153e447d64991
new file mode 100644
index 0000000..b8ba07b
--- /dev/null
+++ b/test/core/end2end/fuzzers/server_fuzzer_corpus/dda9643679f8c8b796e64232a7d153e447d64991
Binary files differ
diff --git a/test/core/end2end/fuzzers/server_fuzzer_corpus/e7b08e36420fa107f0aee652e62158af85a4ef15 b/test/core/end2end/fuzzers/server_fuzzer_corpus/e7b08e36420fa107f0aee652e62158af85a4ef15
new file mode 100644
index 0000000..523c785
--- /dev/null
+++ b/test/core/end2end/fuzzers/server_fuzzer_corpus/e7b08e36420fa107f0aee652e62158af85a4ef15
Binary files differ
diff --git a/test/cpp/end2end/end2end_test.cc b/test/cpp/end2end/end2end_test.cc
index f52aa52..e3667cf 100644
--- a/test/cpp/end2end/end2end_test.cc
+++ b/test/cpp/end2end/end2end_test.cc
@@ -1014,6 +1014,16 @@
   SendRpc(stub_.get(), 1, false);
 }
 
+TEST_P(ProxyEnd2endTest, SimpleRpcWithEmptyMessages) {
+  ResetStub();
+  EchoRequest request;
+  EchoResponse response;
+
+  ClientContext context;
+  Status s = stub_->Echo(&context, request, &response);
+  EXPECT_TRUE(s.ok());
+}
+
 TEST_P(ProxyEnd2endTest, MultipleRpcs) {
   ResetStub();
   std::vector<std::thread*> threads;
diff --git a/tools/run_tests/tests.json b/tools/run_tests/tests.json
index e25052f..67fddc7 100644
--- a/tools/run_tests/tests.json
+++ b/tools/run_tests/tests.json
@@ -72258,6 +72258,23 @@
   }, 
   {
     "args": [
+      "test/core/end2end/fuzzers/server_fuzzer_corpus/23f261e44d54a2736f6e288128d98db9e5015206"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "server_fuzzer_one_entry", 
+    "platforms": [
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
       "test/core/end2end/fuzzers/server_fuzzer_corpus/2463aea879c5ab49f8409d0e5c062c7e086b034b"
     ], 
     "ci_platforms": [
@@ -73686,6 +73703,23 @@
   }, 
   {
     "args": [
+      "test/core/end2end/fuzzers/server_fuzzer_corpus/552199651d942e7220141a93ec33dd8256210a18"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "server_fuzzer_one_entry", 
+    "platforms": [
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
       "test/core/end2end/fuzzers/server_fuzzer_corpus/55af20415ead0ddd417f37fa91a4c767b749ee34"
     ], 
     "ci_platforms": [
@@ -74451,6 +74485,23 @@
   }, 
   {
     "args": [
+      "test/core/end2end/fuzzers/server_fuzzer_corpus/7a946bf3cd91b63001f2cf3f40c515c747f2ecde"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "server_fuzzer_one_entry", 
+    "platforms": [
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
       "test/core/end2end/fuzzers/server_fuzzer_corpus/7b453adcb9c4bf31dbc448ff32c2bc90ebcbdf0f"
     ], 
     "ci_platforms": [
@@ -74468,6 +74519,23 @@
   }, 
   {
     "args": [
+      "test/core/end2end/fuzzers/server_fuzzer_corpus/7d25c28298fb4d0fe41209d0d14307e4aa67c59e"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "server_fuzzer_one_entry", 
+    "platforms": [
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
       "test/core/end2end/fuzzers/server_fuzzer_corpus/7ddfac7d7845b424bf670070781ca6ff8586c63b"
     ], 
     "ci_platforms": [
@@ -74519,6 +74587,23 @@
   }, 
   {
     "args": [
+      "test/core/end2end/fuzzers/server_fuzzer_corpus/8138b18a9a743659befc2f2b23d23cb9c3086a09"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "server_fuzzer_one_entry", 
+    "platforms": [
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
       "test/core/end2end/fuzzers/server_fuzzer_corpus/8164d3c4af043c47cfd6966873bccd2353d072bf"
     ], 
     "ci_platforms": [
@@ -74927,6 +75012,23 @@
   }, 
   {
     "args": [
+      "test/core/end2end/fuzzers/server_fuzzer_corpus/925011abb99fd56bb0f425ae5e0d92e6d341f804"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "server_fuzzer_one_entry", 
+    "platforms": [
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
       "test/core/end2end/fuzzers/server_fuzzer_corpus/93beeba2.bin"
     ], 
     "ci_platforms": [
@@ -76338,6 +76440,23 @@
   }, 
   {
     "args": [
+      "test/core/end2end/fuzzers/server_fuzzer_corpus/crash-c1f66840627e3bfdedf2e4c225bc4de0c267ed37"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "server_fuzzer_one_entry", 
+    "platforms": [
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
       "test/core/end2end/fuzzers/server_fuzzer_corpus/crash-dae0f07934a527989f23f06e630710ff6ca8c809"
     ], 
     "ci_platforms": [
@@ -76440,6 +76559,23 @@
   }, 
   {
     "args": [
+      "test/core/end2end/fuzzers/server_fuzzer_corpus/d6bed9cc3c10338a8c5f41064ff8bec0bbc267ce"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "server_fuzzer_one_entry", 
+    "platforms": [
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
       "test/core/end2end/fuzzers/server_fuzzer_corpus/d8a1d141a9e3876b71c7decbe6e3affccf6de397"
     ], 
     "ci_platforms": [
@@ -76593,6 +76729,23 @@
   }, 
   {
     "args": [
+      "test/core/end2end/fuzzers/server_fuzzer_corpus/dda9643679f8c8b796e64232a7d153e447d64991"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "server_fuzzer_one_entry", 
+    "platforms": [
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
       "test/core/end2end/fuzzers/server_fuzzer_corpus/df5d3cf5f05eab65ef9d385e263780ae73c42b19"
     ], 
     "ci_platforms": [
@@ -76695,6 +76848,23 @@
   }, 
   {
     "args": [
+      "test/core/end2end/fuzzers/server_fuzzer_corpus/e7b08e36420fa107f0aee652e62158af85a4ef15"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "server_fuzzer_one_entry", 
+    "platforms": [
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
       "test/core/end2end/fuzzers/server_fuzzer_corpus/e96ad9c17795e52edc810a08d4fc61fe8790002a"
     ], 
     "ci_platforms": [