On 05/18, Zilvinas Valinskas wrote:
>
> On Thu, 2007-05-17 at 22:45 +0400, Oleg Nesterov wrote:
> >
> > However, I can't understand why cleanup_workqueue_thread() hangs anyway.
> > It shouldn't. Looks like rpciod/1 was preempted, and can't get CPU. According
> > to kernel-nfs-freeze.log it is TASK_RUNNING. Strange.
> >
> > It is very sad, because this code was supposed to be cleanuped anyway,
> > but if it is really buggy, it would be great to know why.
>
> Can this be related to :
>
> CONFIG_PREEMPT=y
Yes, but this preemption should be very unlikely, but it happens every time
for you, strange. lockd in turn spins with preemption enabled, but somehow
rpciod/1 can't make progress. system_state == SYSTEM_HALT, but this shouldn't
affect preempt_schedule_irq(). So I think there is something else.
> workqueue.objdump - without any patch.
So it hangs waiting for cwq->thread == NULL, as expected.
OK. I still can't see how this code could be wrong, but it is bad anyway and
should be changed. The 2nd patch was done more than a month ago, but was
delayed for some stupid reasons. I'll send it today.
Still, it is not clear to me what happens, and you have other crashes with
nfs stop/start
http://marc.info/?l=linux-kernel&m=117939027602591
http://marc.info/?l=linux-kernel&m=117939257630947
which probaly need some attention.
Thanks!
Oleg.
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