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On 1/13/15 4:29 AM, Dr. Werner Fink wrote:
>>> Bash Version: 4.3
>>> Patch Level: 33
>>> Release Status: release
>>>
>>> Description:
>>> Named fifo's causing hanging bash scripts like
>>>
>>> while IFS="|" read a b c ; do
>>> [shell code]
>>> done < <(shell code)
>>>
>>> can cause random hangs of the bash. An strace shows that the bash
>>> stays in wait4()
>>
>> And when you attach to one of the hanging bash processes using gdb, what
>> does the stack traceback look like?
>
> Yes (and sorry for the wrong email address as this was done on a clean
> virtual sysstem)
>
> there are two hanging bash processes together with the find command:
>
> werner 19062 0.8 0.0 11864 2868 ttyS0 S+ 10:21 0:00 bash -x
> /tmp/brp-25-symlink
> werner 19063 0.0 0.0 11860 1920 ttyS0 S+ 10:21 0:00 bash -x
> /tmp/brp-25-symlink
> werner 19064 0.2 0.0 16684 2516 ttyS0 S+ 10:21 0:00 find . -type
> l -printf %p|%h|%l n
>
> the gdb -p 19062 and gdb -p 19063 show
>
> (gdb) bt
> #0 0x00007f530818a65c in waitpid () from /lib64/libc.so.6
> #1 0x000000000042b233 in waitchld (block=block@entry=1, wpid=19175) at
> jobs.c:3235
> #2 0x000000000042c6da in wait_for (pid=pid@entry=19175) at jobs.c:2496
What do ps and gdb tell you about pid 19175 (and the corresponding pid in
the call to waitchld in the other traceback)? Running, terminated, reaped,
other?
Chet
- --
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU c...@case.edu http://cnswww.cns.cwru.edu/~chet/
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