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Message-ID:	<51FB1D9E.5090102@cs.utoronto.ca>
Date:	Thu, 01 Aug 2013 22:46:54 -0400
From:	Ryan Johnson <ryan DOT johnson AT cs DOT utoronto DOT ca>
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To:	cygwin AT cygwin DOT com
Subject:	Re: 64-bit emacs crashes a lot
References:	<51F3151D DOT 7040000 AT cs DOT utoronto DOT ca> <51F33565 DOT 1090406 AT cornell DOT edu> <51F33F52 DOT 4060405 AT cs DOT utoronto DOT ca>
In-Reply-To:	<51F33F52.4060405@cs.utoronto.ca>

On 26/07/2013 11:32 PM, Ryan Johnson wrote:
> On 26/07/2013 10:50 PM, Ken Brown wrote:
>> On 7/26/2013 8:32 PM, Ryan Johnson wrote:
>>> Hi all,
>>>
>>> Running 64-bit cygwin 1.7.22(0.268/5/3), with emacs-nox 24.3-4 inside
>>> mintty 1.2-beta1-1, I keep getting seg faults and "Fatal error 6: 
>>> Aborted"
>
>>> It happens at strange times, invariably during I/O of some kind (either
>>> keyboard input or output from some compilation window); I don't get the
>>> impression it's fork-related. I don't know how to get a backtrace from
>>> emacs, given the way any exception or signal always loses the 
>>> "userland"
>>> stack (suggestions welcome).
>>>
>>> Anyone else seeing this?
>>
>> This doesn't really answer your question since I don't use emacs-nox, 
>> but I've been running 64-bit emacs-X11 and finding it very stable.  I 
>> typically keep it running for several days at a time.
>>
>> You say you don't know how to get a backtrace from emacs.  I assume 
>> you've installed emacs-debuginfo and run emacs under gdb. Are you 
>> saying you can never get a backtrace after it crashes?
> I do have the emacs-debuginfo. I meant that the stack dump didn't have 
> any emacs frames in it (they were all cygwin1.dll), and my experience 
> with cygwin/gdb is that once you've taken a signal or exception you 
> lose the cygwin stack and just see a bunch of threads mucking around 
> in various low-level Windows dlls.
>
> I have tried attaching gdb to emacs and setting a breakpoint on 
> abort(), but it didn't catch anything yet. I'm also hampered by gdb 
> constantly getting confused, breaking partway into emacs, and having 
> to detach/reattach it. I've started a new thread for that issue.

Here's a new one... I started a compilation, but before it actually 
invoked the command it started pegging the CPU. After ^G^G^G, it crashed 
with the following:
> Auto-save? (y or n) y
>       0 [main] emacs 5076 C:\cygwin64\bin\emacs-nox.exe: *** fatal 
> error - Internal error: TP_NUM_W_BUFS too small 2268032 >= 10.
> Hangup

The stackdump has the following:
> usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/exception.h:65
> /usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/dcrt0.cc:1268
> /usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/dcrt0.cc:1277
> /usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/tls_pbuf.cc:53
> /usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/path.cc:614
> /usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/syscalls.cc:1894
> 001801130CB
> 00000000023
> 000775DB65E
> /usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/miscfuncs.cc:803
> /usr/src/debug/emacs-24.3-4/src/alloc.c:2147
> /usr/src/debug/emacs-24.3-4/src/fileio.c:5465
> /usr/src/debug/emacs-24.3-4/src/keyboard.c:10755
> /usr/src/debug/emacs-24.3-4/src/sysdep.c:1582
> /usr/src/debug/cygwin-1.7.22-1/winsup/cygwin/exceptions.cc:1453
> 001801131E1

Thoughts?
Ryan


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