emacs child process goes defunct
Ken Brown
kbrown@cornell.edu
Fri Dec 7 16:37:00 GMT 2012
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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