[Bug c++/52762] Firefox 11 segfault with gcc 4.7 (-O3 -march=corei7-avx)

[fragabr at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52762

--- Comment #2 from Dâniel Fraga <fragabr at gmail dot com> 2012-03-29 17:38:48 UTC ---
Hi Marcus, here it's the backtrace with --enable-debug. If you need more
testing, just ask:

[New Thread 139808722073408 (LWP 23395)]
nsStringStats
 => mAllocCount:              1
 => mReallocCount:            0
 => mFreeCount:               1
 => mShareCount:              0
 => mAdoptCount:              0
 => mAdoptFreeCount:          0
[New Thread 139808524986112 (LWP 23399)]
[New Thread 139808508339968 (LWP 23400)]
[New Thread 139808499947264 (LWP 23401)]
[New Thread 139808487765760 (LWP 23403)]
[New Thread 139808461412096 (LWP 23404)]
[New Thread 139808450914048 (LWP 23405)]
[New Thread 139808442521344 (LWP 23406)]
WARNING: 1 sort operation has occurred for the SQL statement '0x7f27c0166010'. 
See https://developer.mozilla.org/En/Storage/Warnings details.: file
/home/fraga/src/mozilla/storage/src/mozStoragePrivateHelpers.cpp, line 144
[New Thread 139808411809536 (LWP 23407)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 139808722073408 (LWP 23395)]
0x00007f27bd707fc9 in JSRuntime::onOwnerThread () from
/usr/local/lib/firefox-11.0/libxul.so
(gdb) bt
#0  0x00007f27bd707fc9 in JSRuntime::onOwnerThread () from
/usr/local/lib/firefox-11.0/libxul.so
#1  0x00007f27bd71412e in JS_ValueToObject () from
/usr/local/lib/firefox-11.0/libxul.so
#2  0x00007f27bd08de23 in ?? () from /usr/local/lib/firefox-11.0/libxul.so
#3  0x00007f27bd545abc in NS_InvokeByIndex_P () from
/usr/local/lib/firefox-11.0/libxul.so
#4  0x00007f27bd0b1036 in ?? () from /usr/local/lib/firefox-11.0/libxul.so
#5  0x00007f27bd0b618f in ?? () from /usr/local/lib/firefox-11.0/libxul.so
#6  0x00007f27bd0b67e3 in ?? () from /usr/local/lib/firefox-11.0/libxul.so
#7  0x00007f27bd0bab60 in ?? () from /usr/local/lib/firefox-11.0/libxul.so
#8  0x00007f27bd82826a in ?? () from /usr/local/lib/firefox-11.0/libxul.so
#9  0x00007f27bd8262d9 in ?? () from /usr/local/lib/firefox-11.0/libxul.so
#10 0x00007f27bd812b69 in ?? () from /usr/local/lib/firefox-11.0/libxul.so
#11 0x00007f27bd826483 in ?? () from /usr/local/lib/firefox-11.0/libxul.so
#12 0x0000000000000000 in ?? ()