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Re: Fwd: gdb on Cygwin cannot give correct call stacks for segment faults
- From: Eli Zaretskii <eliz at gnu dot org>
- To: Pan ruochen <panruochen at gmail dot com>
- Cc: gdb at sourceware dot org
- Date: Mon, 28 Oct 2013 18:12:05 +0200
- Subject: Re: Fwd: gdb on Cygwin cannot give correct call stacks for segment faults
- Authentication-results: sourceware.org; auth=none
- References: <CALX7UOgBuWzx_8dO+Aev=1MfLLSma6CQdcQqi6iURCA1HR7snA at mail dot gmail dot com> <CALX7UOiD9AxWH2aqPsDdwOHQj3wAOsOXA+qSCJv4LTOuoND96g at mail dot gmail dot com>
- Reply-to: Eli Zaretskii <eliz at gnu dot org>
> Date: Mon, 28 Oct 2013 12:00:17 +0800
> From: Pan ruochen <panruochen@gmail.com>
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x61138b61 in _fwrite_r () from /usr/bin/cygwin1.dll
> (gdb) backtrace
> #0 0x61138b61 in _fwrite_r () from /usr/bin/cygwin1.dll
> #1 0x76bd1194 in WaitForSingleObjectEx ()
> from /cygdrive/c/windows/syswow64/kernel32.dll
> #2 0x76bd1148 in WaitForSingleObject ()
> from /cygdrive/c/windows/syswow64/kernel32.dll
> #3 0x610dd558 in sig_send(_pinfo*, siginfo_t&, _cygtls*) ()
> from /usr/bin/cygwin1.dll
> #4 0x610303b4 in exception::handle(_EXCEPTION_RECORD*,
> _exception_list*, _CONTEXT*, void*) () from /usr/bin/cygwin1.dll
> #5 0x77a5b499 in ntdll!LdrRemoveLoadAsDataTable ()
> from /cygdrive/c/windows/system32/ntdll.dll
> #6 0x0028a6ac in ?? ()
> #7 0x77a5b46b in ntdll!LdrRemoveLoadAsDataTable ()
> from /cygdrive/c/windows/system32/ntdll.dll
> #8 0x0028a6ac in ?? ()
> #9 0x77a10133 in ntdll!KiUserExceptionDispatcher ()
> from /cygdrive/c/windows/system32/ntdll.dll
> #10 0x0028a6ac in ?? ()
> #11 0x61138c75 in fwrite () from /usr/bin/cygwin1.dll
> #12 0x610d75e5 in _sigfe () from /usr/bin/cygwin1.dll
> #13 0x0000000d in ?? ()
> #14 0x00000000 in ?? ()
>
> does not give any useful clues where the segment faults arise.
> So what is wrong?
My crystal ball says you are looking at the wrong thread. Try "thread
apply all backtrace".