linux-kernel - Re: INFO: task journal:337 blocked for more than 120 seconds

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Date:	Fri, 02 Oct 2009 11:30:47 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Shirley Ma <mashirle@...ibm.com>
CC:	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jens Axboe <jens.axboe@...cle.com>,
	Kevin Bowling <kevinb@...lograils.com>,
	Andrew Jones <drjones@...hat.com>
Subject: Re: INFO: task journal:337 blocked for more than 120 seconds

On 09/30/09 14:11, Shirley Ma wrote:
> Anybody found this problem before? I kept hitting this issue for 2.6.31
> guest kernel even with a simple network test.
>
> INFO: task kjournal:337 blocked for more than 120 seconds.
> "echo 0 > /proc/sys/kernel/hung_task_timeout_sec" disables this message.
>
> kjournald	D 00000041	0	337	2 0x00000000
>
> My test is totally being blocked.

I'm assuming from the lists you've posted to that this is under KVM? 
What disk drivers are you using (virtio or emulated)?

Can you get a full stack backtrace of kjournald?

Kevin Bowling submitted a RH bug against Xen with apparently the same
symptoms (https://bugzilla.redhat.com/show_bug.cgi?id=526627).  I'm
wondering if there's a core kernel bug here, which is perhaps more
easily triggered by the changed timing in a virtual machine.

Thanks,
    J
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