ThreadSanitizer dies with misaligned stack errors on Mac OS

[GoogleCodeExporter]

To reproduce, sync third_party/valgrind to r75, build TSan and run:

$ tsan_inst/bin/valgrind  --tool=tsan ls
==82415== ThreadSanitizer, a data race detector
==82415== Copyright (C) 2008-2010, and GNU GPL'd, by Google Inc.
==82415== Using Valgrind-3.7.0.SVN and LibVEX; rerun with -h for copyright info
==82415== Command: ls
==82415== 
==82415== ThreadSanitizerValgrind r2526: hybrid=no
==82415== INFO: Allocating 192Mb (24 * 8M) for Segments.
==82415== INFO: Will allocate up to 320Mb for 'previous' stack traces.
--82415-- 
/Users/glider/src/data-race-test/tsan/bin/vgpreload_tsan-x86-darwin.so:
--82415-- dSYM directory is missing; consider using --dsymutil=yes
==82415== 
==82415== Process terminating with default action of signal 11 (SIGSEGV)
==82415==  General Protection Fault
==82415==    at 0x8FE18C02: misaligned_stack_error (in /usr/lib/dyld)
==82415==    by 0xA16B2EB: _malloc_initialize (in /usr/lib/libSystem.B.dylib)
==82415==    by 0xA091803: calloc (in /usr/lib/libSystem.B.dylib)
==82415==    by 0xA01D88B: calloc (in 
/Users/glider/src/data-race-test/tsan/bin/vgpreload_tsan-x86-darwin.so)
==82415==    by 0xA091799: dwarf2_unwind_dyld_add_image_hook (in 
/usr/lib/libSystem.B.dylib)
==82415==    by 0x8FE03D61: dyld::registerAddCallback(void (*)(mach_header 
const*, long)) (in /usr/lib/dyld)
==82415==    by 0xA090B3A: _dyld_register_func_for_add_image (in 
/usr/lib/libSystem.B.dylib)
==82415==    by 0xA089CB5: __keymgr_initializer (in /usr/lib/libSystem.B.dylib)
==82415==    by 0xA0890C0: libSystem_initializer (in /usr/lib/libSystem.B.dylib)
==82415==    by 0x8FE12F35: 
ImageLoaderMachO::doModInitFunctions(ImageLoader::LinkContext const&) (in 
/usr/lib/dyld)
==82415==    by 0x8FE0E7E2: 
ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned 
int) (in /usr/lib/dyld)
==82415==    by 0x8FE0E774: 
ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned 
int) (in /usr/lib/dyld)
==82415== 
==82415== ThreadSanitizer summary: reported 0 warning(s) (0 race(s))
Segmentation fault

Original issue reported on code.google.com by gli...@google.com on 27 Oct 2010 at 8:03

[GoogleCodeExporter]

VEX revision r2057 introduced explicit alignment checks for SSE instructions. 
Now those checks occasionally fire within our wrappers.
The same problem for Helgrind wrappers was fixed by changing valgrind.h in 
r11461, which is present in valgrind-variant r75. However, this seems to be 
still broken for TSan.

See also https://bugs.kde.org/show_bug.cgi?id=254646

Original comment by gli...@google.com on 27 Oct 2010 at 8:41

[GoogleCodeExporter]

I've disabled the checks temporarily. Need to investigate the cause of 
unaligned accesses.

Original comment by gli...@google.com on 27 Oct 2010 at 9:32