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[Bug boehm-gc/66848] boehm-gc fails test suite on x86_64-apple-darwin15


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66848

--- Comment #4 from Jack Howarth <howarth.at.gcc at gmail dot com> ---
The gctest hang backtraces as...

# lldb ./gctest
(lldb) target create "./gctest"
Current executable set to './gctest' (x86_64).
(lldb) r
Process 35911 launched: './gctest' (x86_64)
Switched to incremental mode
Emulating dirty bits with mprotect/signals
thread_get_state failed in forward_exception
Process 35911 stopped
* thread #2: tid = 0x20d116, 0x00007fff8e6c4076
libsystem_kernel.dylib`__pthread_kill + 10, stop reason = signal SIGABRT
    frame #0: 0x00007fff8e6c4076 libsystem_kernel.dylib`__pthread_kill + 10
libsystem_kernel.dylib`__pthread_kill:
->  0x7fff8e6c4076 <+10>: jae    0x7fff8e6c4080            ; <+20>
    0x7fff8e6c4078 <+12>: movq   %rax, %rdi
    0x7fff8e6c407b <+15>: jmp    0x7fff8e6bf0df            ; cerror_nocancel
    0x7fff8e6c4080 <+20>: retq   
(lldb) bt
* thread #2: tid = 0x20d116, 0x00007fff8e6c4076
libsystem_kernel.dylib`__pthread_kill + 10, stop reason = signal SIGABRT
  * frame #0: 0x00007fff8e6c4076 libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff9e61163d libsystem_pthread.dylib`pthread_kill + 90
    frame #2: 0x00007fff95d5783b libsystem_c.dylib`abort + 129
    frame #3: 0x0000000100022e29 libgcjgc.1.dylib`GC_abort(msg=<unavailable>) +
57 at misc.c:1081
(lldb)


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