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From: "amodra at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/52839] double free or corruption running tr1/.../default_weaktoshared.exe
Date: Thu, 05 Apr 2012 08:07:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52839

--- Comment #15 from Alan Modra <amodra at gmail dot com> 2012-04-05 08:06:30 UTC ---
Many hours later one of my 32-bit tests failed, but I'm relieved to say it was
only the pthread_once bug.

#0  0x0fbd839c in raise () from /lib/power7/libc.so.6
#1  0x0fbda034 in abort () from /lib/power7/libc.so.6
#2  0x0fd9f480 in uw_init_context_1 (context=context@entry=0xf2dce8f8,
outer_cfa=outer_cfa@entry=0xf2dcecf0, outer_ra=0xff20f98) at
/home/amodra/src/gcc-current/libgcc/unwind-dw2.c:1502
#3  0x0fd9fb7c in _Unwind_RaiseException (exc=0x1002c360) at
/home/amodra/src/gcc-current/libgcc/unwind.inc:88
#4  0x0ff20f98 in __cxxabiv1::__cxa_throw (obj=0x1002c380, tinfo=<optimized
out>, dest=<optimized out>) at
/home/amodra/src/gcc-current/libstdc++-v3/libsupc++/eh_throw.cc:78
#5  0x10000d24 in std::tr1::__throw_bad_weak_ptr () at
/home/amodra/build/gcc-current/powerpc-linux/libstdc++-v3/include/tr1/shared_ptr.h:76
#6  0x10000e9c in _M_add_ref_lock (this=0x10021f60) at
/home/amodra/build/gcc-current/powerpc-linux/libstdc++-v3/include/tr1/shared_ptr.h:244
#7  __shared_count (__r=..., this=<synthetic pointer>) at
/home/amodra/build/gcc-current/powerpc-linux/libstdc++-v3/include/tr1/shared_ptr.h:494
#8  __shared_ptr<A> (__r=..., this=<synthetic pointer>) at
/home/amodra/build/gcc-current/powerpc-linux/libstdc++-v3/include/tr1/shared_ptr.h:586
#9  shared_ptr<A> (__r=..., this=<synthetic pointer>) at
/home/amodra/build/gcc-current/powerpc-linux/libstdc++-v3/include/tr1/shared_ptr.h:1015
#10 thread_hammer (opaque_weak=0x1002db44) at
/home/amodra/src/gcc-current/libstdc++-v3/testsuite/tr1/2_general_utilities/shared_ptr/thread/default_weaktoshared.cc:132
#11 0x0fd5749c in start_thread () from /lib/power7/libpthread.so.0
#12 0x0fc92160 in clone () from /lib/power7/libc.so.6