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Message-ID:	<4FBCD166.8080101@cornell.edu>
Date:	Wed, 23 May 2012 08:00:38 -0400
From:	Ken Brown <kbrown AT cornell DOT edu>
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To:	cygwin AT cygwin DOT com
Subject:	Re: "emacs -nw" hangs in a terminal
References:	<4FB3CFCC DOT 6030407 AT cornell DOT edu> <7r7gw6kl6r DOT fsf AT ws796-of-spb DOT ru DOT yotateam DOT com> <7rmx513ol1 DOT fsf AT ws796-of-spb DOT ru DOT yotateam DOT com> <4FBA12C7 DOT 4070305 AT cornell DOT edu> <4FBA5FDA DOT 7080801 AT cornell DOT edu> <20120521162908 DOT GP7763 AT calimero DOT vinschen DOT de> <4FBA8EA0 DOT 4040905 AT cornell DOT edu> <20120522112828 DOT GA9200 AT calimero DOT vinschen DOT de> <4FBB7BA6 DOT 9000409 AT cornell DOT edu> <20120522134119 DOT GB9200 AT calimero DOT vinschen DOT de> <20120522134932 DOT GC9200 AT calimero DOT vinschen DOT de>
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On 5/22/2012 9:49 AM, Corinna Vinschen wrote:
> On May 22 15:41, Corinna Vinschen wrote:
>> On May 22 07:42, Ken Brown wrote:
>>> On 5/22/2012 7:28 AM, Corinna Vinschen wrote:
>>>> On May 21 14:51, Ken Brown wrote:
>>>>> On 5/21/2012 12:29 PM, Corinna Vinschen wrote:
>>>>>> On May 21 11:31, Ken Brown wrote:
>>>>>>> On 5/21/2012 6:02 AM, Ken Brown wrote:
>>>>>>> I've discovered something strange by running emacs under gdb.  If I
>>>>>>> start emacs-24 in a terminal (but not under X) and start a shell as
>>>>>>> you did, then every press of C-g creates a new thread, and these are
>>>>>>> never destroyed.  I'm pretty sure the threads are created by Cygwin,
>>>>>>> not by emacs.

I've gotten some more information from gdb.  The crash occurs after a 
call to _longjmp, and gdb shows a new thread created right at that 
point.  This doesn't happen when I run emacs under X instead of in 
mintty.  Here's an excerpt from the gdb session, with the strange thread 
marked:

$ gdb -p 6492
[...]
Attaching to process 6048
[New Thread 6048.0x668]
[New Thread 6048.0x1a5c]
[New Thread 6048.0x2630]
[New Thread 6048.0x1d14]
Reading symbols from /home/kbrown/src/emacs/test-nox/src/emacs.exe...done.
[...]
(gdb) b unwind_to_catch
Breakpoint 3 at 0x52aca2: file eval.c, line 1234.
(gdb) c
Continuing.
[Switching to Thread 6048.0x668]
[...]
Breakpoint 3, unwind_to_catch (catch=0x28a8d0, value=12985830) at 
eval.c:1234
1234      catch->val = value;
(gdb) n
[...]
1272      _longjmp (catch->jmp, 1);
(gdb)
[New Thread 6048.0x1e04]   <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Program received signal SIGSEGV, Segmentation fault.
0x76f3f8b1 in ntdll!RtlUpdateClonedSRWLock () from 
/c/windows/SysWOW64/ntdll.dll
(gdb) thread apply all bt full

[compressed output attached]

And here's the stackdump:

Exception: STATUS_ACCESS_VIOLATION at eip=610CFA77
eax=80106D50 ebx=34322D73 ecx=766231E7 edx=00000000 esi=00000001 
edi=00000050
ebp=048FACC8 esp=048FACA0 
program=C:\cygwin\home\kbrown\src\emacs\test-nox\src\emacs.exe, pid 
6492, thread pipesel

Ken




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