Problems with Emacs

[Charles Plager]

Summary:

Emacs since being update has two common failure modes:
1) Taking all the CPU
2) Crashing.

An update:

* Updated cygwin to official 1.5.7-1 release

* As suggested, I have been trying to use strace -p on the emacs pid. 
After updating strace from a snapshot, I was still having problems. 
When emacs has gone into a mode that uses all the CPU, nothing shows up 
on the strace output until I kill it (using kill.exe) and then I get the 
output of the first attached file.

* One time emacs crashed, it left a stackdump file (second file attached)

* Third attachment is latest cygcheck.out (not much should have changed, 
but just for completeness).

	Thanks,
	  Charles

>     * From: "I-Taylor, Trevor" <trevor dot taylor2 at boeing dot com>
>     * To: <cygwin at cygwin dot com>
>     * Date: Tue, 3 Feb 2004 09:20:23 +1000
>     * Subject: re: Problems with Emacs
> 
>>Yesterday, I reinstalled cygwin from scratch choosing (among other 
>>packages) the latest version 21.2.12 of emacs. Most of the time I try to 
>>start the program (using X) , it launches o.k. But sometimes, the window 
>>pops up and it freezes taking all of the cpu (it says "loading ed mode").
>>I have repeatedly tried to uninstall and reinstall emacs and I keep
>>getting the same errors.
>>
>>Does anybody have any ideas? Has anybody else seen this?
> 
> Yes,
> 
> I updated my cygwin installation on friday 23 january 2004, and immediately emacs has become unreliable. Attached updated.txt shows what was updated.
> 
> emacs core dumps regularly, sometimes when I'm not touching it, sometimes when I am. I tried to use dumper.exe to actually get a core dump. It didn't work the first couple of times (see attached "core dump from dumper"), but then I got a core dump with stack trace (seen twice):
> 
> #0  0x77f83786 in ntdll!ZwWaitForSingleObject ()
> (gdb) bt
> #0  0x77f83786 in ntdll!ZwWaitForSingleObject ()
> #1  0x77e8780f in WaitForSingleObjectEx ()
> #2  0x77e87837 in WaitForSingleObject ()
> #3  0x000000c8 in ?? ()
> #4  0x0000ea60 in ?? ()
> 
> I also got:
> 
> - [3]+  Segmentation fault      emacs  (wd: /cygdrive/h/matrix-drawing-analysis-tools/lib)
> 
>    with no core dump (dumper didn't seem to be invoked) regularly
> 
> - X protocol errors:
> 
>    this seems to have stopped happening, and I didn't capture
>    the message at the times, but from memory it was something about
>    a bad length. I tries running emacs "synchronous" under gdb
>    to catch the stack trace at the time but gdb couldn't break in
>    _XError (or main for that matter).
> 
> I also tried:
> 
> - running emacs -nw (didn't crash)
> - going back to XWin windowed mode (i.e. default behaviour), which is what I was using before any upgrades:
>    - got emacs exit with Segmentation Fault (no core dump)
> - running emacs -q (still in XWin windowed mode):
>    - got "Exit 128 emacs -q (wd: ~)" (no core dump)
> - building emacs from sources (the gnu emacs distribution):
>    - configure doesn't know about cygwin
> 
> How is the emacs code (officially) compiled for cygwin (it might help if I could compile it with debug and run it under gdb)?
> 
> Trevor

-- 
------------------------------------------------------------------
Charles Plager                               cplager+ucla@fnal.gov
Dept of Physics, UCLA             http://www-cdf.fnal.gov/~cplager
office: (1) 630-840-2575                     fax: (1) 630-840-2968
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