From: Roger Heflin on
Faidon Liambotis wrote:
> Justin Piszcz wrote:
> > Found root cause-- root cause is asterisk PBX software. I use an
> SPA3102.
>> When someone called me, they accidentally dropped the connection, I called
>> them back in a short period. It is during this time (and the last time)
>> this happened that the box froze under multiple(!) kernels, always when
>> someone was calling.
> <snip>
>> I don't know what asterisk is doing but top did run before the crash
>> and asterisk was using 100% CPU and as I noted before all other processes
>> were in D-state.
>> When this bug occurs, it freezes I/O to all devices and the only way to
>> recover
>> is to reboot the system.
> That's obviously *not* the root cause.
> It's not normal for an application that isn't even privileged to hang
> all I/O and, subsequently everything on a system.
> This is almost probably a kernel issue and asterisk just does something
> that triggers this bug.
> Regards,
> Faidon

I had an application in 2.6.5 (SLES9)...that would hang XFS.

The underlying application was multi-threaded and both threads were
doing full disks syncs every so often, and sometimes when doing the
full disk sync the XFS subsystem would deadlock, it appeared to me tha
one sync had a lock and was waiting for another, and the other process
had the second lock and was waiting for the first... We were able to
disable the full disk sync from the application and the deadlock went
away. All non-xfs filesytems still worked and could still be
accessed. I did report the bug with some traces but I don't believe
anyone ever determined where the underlying issues was.

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