linux-kernel - Re: 2.6.16.32 stuck in generic_file_aio

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Date:	Wed, 6 Dec 2006 17:14:08 +0100 (CET)
From:	Igmar Palsenberg <i.palsenberg@...-ict.nl>
To:	Andrew Morton <akpm@...l.org>
cc:	linux-kernel@...r.kernel.org, npiggin@...e.de
Subject: Re: 2.6.16.32 stuck in generic_file_aio_write()


> > Done some more digging : isn't http://lkml.org/lkml/2006/10/13/139 somehow 
> > related ? I do see pagefaults, and inode locks and mmap_locks. 
> > 
> 
> I thought it was, but from my look through yout 8-billion-task backtrace,
> no task was stuck in D-state with the appropriate call trace.
> 
> So I don't know what's causing this.  In the first trace you have at least
> four D-state kjournalds and a lot of processes stuck on an i_mutex.  I
> guess it's consistent with an IO system which is losing completion
> interrupts. 

Hmm.. Is there any way to make sure ? I've got a second machine (almost 
identical), which doesn't show this.

The main difference is the running kernel. I've had them at the same 
kernel, at which bad machine still crashes.

/proc/interrupts

Bad machine  : 18:   11160637   11235698   IO-APIC-fasteoi   arcmsr
Good machine : 18:   61658630   79352227   IO-APIC-level  arcmsr

Bad machine is running 2.6.19, good is running 2.6.14.7-grsec, which 
probably accounts for these changes.

> AFAICT in the second trace all you have is a lot of processes
> stuck on i_mutex for no obvious reason - I don't know why that would
> happen.

It's consequent, also the traces.
 
> How long does it take for this to happen?

Days to a week tops. It does happen less frequent with the 2.6.19, 
2.6.16.32 triggered it almost daily.

> Yes, lockdep might find something.

I've enabled most debug options. I'll boot the other kernel tomorrow.



Regards,


	Igmar
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