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Date:	Fri, 07 Dec 2012 11:35:59 -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 10:42 PM, Ken Brown wrote:
> 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.

One other question:  Both you and Jonas Linde have said that emacs 
"hangs".  Do you see the CPU usage increasing when this happens?  If so, 
that would suggest an infinite loop.

Ken


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