Fix 343173 - helgrind crash during stack unwind
This fixes a helgrind crash detected on android.
Android bionic pthread lib unmaps the stack for detached threads
before exiting.
Helgrind tries to unwind the stack to record a 'read' after
the stack unmap, just before the exit syscall.
The unwind then causes a SEGV.
The solution consists in tightening the calculation of
the stack limits, so as to stop unwinding when no valid stack
can be found.
Regression test reproduces the same problem by simulating the
bionic behaviour on linux, using asm similar to bionic lib.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14976 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/NEWS b/NEWS
index 06bc534..75cf7c7 100644
--- a/NEWS
+++ b/NEWS
@@ -88,6 +88,7 @@
342795 Internal glibc __GI_mempcpy call should be intercepted
343012 Unhandled syscall 319 (memfd_create)
343069 Patch updating v4l2 API support
+343173 helgrind crash during stack unwind
343303 Fix known deliberate memory leak in setenv() on Mac OS X 10.10
343306 OS X 10.10: UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option
343332 Unhandled instruction 0x9E310021 (fcvtmu) on aarch64