From: Jan Kara <jack@suse.cz>
To: Gerard Saraber <gsaraber@gmail.com>
Cc: linux-kernel@vger.kernel.org, xfs@oss.sgi.com
Subject: Re: Soft lockup problem
Date: Mon, 6 Feb 2012 23:51:22 +0100 [thread overview]
Message-ID: <20120206225122.GF24840@quack.suse.cz> (raw)
In-Reply-To: <CAOgv-ziomS-+ML0Xb4oSoWTjzkG8BBBQcMjXwn7rjQV2pFtQ6Q@mail.gmail.com>
On Mon 06-02-12 09:40:45, Gerard Saraber wrote:
> Greetings everyone,
> I've been having a bit of a problem since upgrading to the linux 3.x
> series, I have a machine that we're using as a NAS that runs various
> rsync processes (mostly at night), lately after a day or two, I will
> come in in the morning to a load average of 49, but the machine not
> really doing anything, when trying to run 'dstat' the command just
> hung with no output at all. there were no errors in the logs, or even
> anything that would vaguely point at anything I could work with.
> So needing to get the machine back to work I attempted to reboot it
> "shutdown -r now" on console... it gives a nice message saying it's
> going to reboot, but nothing ever happens.. the only way to reboot it
> is by using ctrl + alt + sysrq + b. after which the machine reboots
> and the raid array comes back clean.
>
> I'm not sure how to troubleshoot this, any pointers would be appreciated.
>
> I'm compiling 3.2.4 at the moment and found a bunch of possibly useful
> options in the kernel debugging section:
> detect hard/soft lockups and detect hung tasks, maybe it'll give me
> something more to go on.
>
> Some details about the machine:
> Linux xenbox 3.2.2 #1 SMP Sun Jan 29 10:28:22 CST 2012 x86_64 Intel(R)
> Xeon(R) CPU 5140 @ 2.33GHz GenuineIntel GNU/Linux
> It has 3 software raid arrays (2 x 5 drives and 1 x 4 drives) LVM'ed
> together into a 23TB XFS filesystem.
> 6GB memory and a pair of Intel Gigabit ethernet controllers bonded together.
Hmm, might be some deadlock in the filesystem. Adding XFS guys to CC.
Can you run 'echo w >/proc/sysrq-trigger' and post output of dmesg here?
Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
next prev parent reply other threads:[~2012-02-06 22:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-06 15:40 Soft lockup problem Gerard Saraber
2012-02-06 17:37 ` Gerard Saraber
2012-02-06 22:51 ` Jan Kara [this message]
2012-02-07 16:35 ` Gerard Saraber
2012-02-07 16:54 ` Jan Kara
2012-02-27 14:38 ` Gerard Saraber
[not found] ` <CAOgv-zjF3YSLuGu0p0xkCp5ZfWu2H1Xg8aQ7xcpCQqWOdwh1aA@mail.gmail.com>
2012-02-29 19:14 ` Jan Kara
[not found] <20120207215737.10744.qmail@md.dent.med.uni-muenchen.de>
2012-02-07 22:52 ` Jan Kara
2012-02-07 23:16 ` Wolfram Gloger
2012-02-08 9:23 ` Jan Kara
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