Re: Kernel NFS lockd freezes notebook on shutdown (Linux 2.6.22-rc1 + CFS v12)

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Hello Oleg,

I've done some more tests and quite frankly I think this is really related to the dreaded ''fglrx.ko'' module. It seems to me that it is much easier to reproduce the problem if that damn module is loaded. It does uses workqueue. Then there is another driver ipw3945 loaded and it is required to run binary only ''ipw3945d'' daemon just to start using wireless driver ...

In either way both these kernel modules are workqueue users.

Btw, I had also tested kernel (compiled from the same source) but on different laptop (EVO N800v), single core, Pentium M 2GHz. Kernel is not freezing on shutdown, even loop nfs kernel stop/start - does not cause any kernel panic as on nx9420 (Dual Core) laptop. And that with or without any patch applied from Oleg. :((

I think this time it is really needed to stop here, kernel was tainted for a reason. :(((

Thank you both, Oleg and Andrew.

Zilvinas "Lucky ATI fglrx owner" Valinskas

On Sat, 19 May 2007, Oleg Nesterov wrote:

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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