Funny hang with snapshop 20050920

[Volker Quetschke]

Christopher Faylor wrote:
> On Thu, Sep 22, 2005 at 10:18:51PM -0400, Volker Quetschke wrote:
>
>>My favorite testcase (building OOo) started hanging again.
>> ...
>>But now the *really* strange part begins: You can break the hang by doing
>> "ls /proc/3176/fd" !?
>>and the build continues (until the next hang).
>>
>>Sorry, we're unable to create a reduced testcase but we thought the
>>strange symptoms might help pinpoint the problem.
>>
>>Attached you also find the cygcheck output of that system.
>
> Does sending a 'kill -CONT 3176' also unstick things?  Both situations send a
> signal to the process.

Sorry, this question got lost, but ...

> How about attaching to the hung process with strace?  You didn't mention
> that.

he tried to attach and strace was standing there without output.
A "ls /proc/<pid>/fd" produced then the first four lines of the
attached strace log but tcsh still hung.

Several "ls /proc/<pid>/fd" later it continued and produced the
rest of that logfile.

Did you notice that the WINPID of the hanging tcsh is the same as
the PID? This is always the case if it hangs.

Additional info: Both tcsh processes exist with the respective
WINPID in taskmgr.

Thanks for your efforts,

     Volker

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