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Date: Thu, 06 Dec 2012 22:42:51 -0500
From: Ken Brown <kbrown AT cornell DOT edu>
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Subject: Re: emacs child process goes defunct
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On 12/6/2012 5:20 PM, Rockefeller, Harry wrote:
> 'Emacs -Q' failed after a few minutes of doing svn file diffs.

Can you give me a detailed step-by-step recipe so that I can try to 
reproduce the problem?  I don't really know what you mean by "doing svn 
file diffs".

> I ran gdb on the hung process.  I am not too familiar with this
> kind of debugging.
> Let me know if there is more I can give next time this happens.
> Here is some output.
>
> ps
>        PID    PPID    PGID     WINPID   TTY     UID    STIME COMMAND
>       8304        1    8304       8304  cons0   11097 15:35:35 /usr/bin/xterm
>       3032    8304    3032       8048  pty2    11097 15:35:42 /usr/bin/bash
>       6428    3032    3032       7580  pty2    11097 15:35:48 /usr/bin/xterm
>       6304    6428    6304       9440  pty3    11097 15:35:48 /usr/bin/bash
>       6120    6304    6120      10052  pty3    11097 15:42:55 /usr/bin/emacs-X11
>       7124    6120    7124       8524  ?       11097 16:02:29 /usr/bin/diff <defunct>
>
> And
>
> $ gdb --pid=6120
> GNU gdb (GDB) 7.5.50.20120815-cvs (cygwin-special)
> Copyright (C) 2012 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "i686-cygwin".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Attaching to process 10052
> [New Thread 10052.0x2028]
> [New Thread 10052.0x2434]
> [New Thread 10052.0x1100]
> [New Thread 10052.0x78c]
> [New Thread 10052.0x225c]
> [New Thread 10052.0xca4]
> [New Thread 10052.0x2234]
> Reading symbols from /usr/bin/emacs-X11.exe...Reading symbols from /usr/lib/debug/usr/bin/emacs-X11.exe.dbg...done.
> done.
> (gdb) bt
> #0  0x7c90120f in ntdll!DbgUiConnectToDbg () from /cygdrive/c/WINDOWS/system32/ntdll.dll
> #1  0x7c952119 in ntdll!KiIntSystemCall () from /cygdrive/c/WINDOWS/system32/ntdll.dll
> #2  0x00000005 in ?? ()
> #3  0x00000000 in ?? ()

This is a backtrace of a thread that gdb has created.  You need to 
switch to thread 1 (the main emacs thread) before you can get a useful 
backtrace:

(gdb) thread 1
(gdb) bt

Even better, you can get a backtrace of all threads with the command 
`thread apply all bt' or, for more detail, `thread apply all bt full'.

And please attach cygcheck output when you write again.

Ken

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