Subject: Re: PROBLEM: All CPUs in soft lockup
From: li guang <lig.fnst@cn.fujitsu.com>
To: Robert Norris <robn@fastmail.fm>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <20130327015540.GA27623@pyro.melbourne.osa>
References: <20130327015540.GA27623@pyro.melbourne.osa>
Date: Wed, 27 Mar 2013 11:42:54 +0800
Message-ID: <1364355774.31713.30.camel@liguang.fnst.cn.fujitsu.com>
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seems tasks are hogging your cpu/memory resource,
did you check status your servicing processes?

在 2013-03-27三的 12:55 +1100，Robert Norris写道：
> In the last two weeks we've had three servers (identical hardware,
> software and load) hang. The details in this report are from one that
> hung last night.
> 
> They're all IMAP servers servicing many hundreds of users, so several
> thousand processes and active connections. There's been two major
> application level changes in the last couple of weeks, corresponding to
> the time where these hangs started. One is that we now do mail event
> notifications directly to user clients, so more TCP connections. The
> other is that we're now maintaining live search indexes, so a lot more
> disk and tmpfs IO.
> 
> All that said, we're not under what we'd consider to be heavy load. When
> they're running, the servers are fast and responsive.
> 
> During the hang itself, the machine responds to pings, and TCP
> connections can be established, but the servicing processes never
> respond. The console shows a new "BUG: soft lockup" line every few
> seconds, and will not respond to keyboard input. It is a virtual console
> though, which may or may not make a difference, I'm not sure.
> 
> The kernel is 3.4.33 with AUFS patches applied. However there are no
> AUFS mounts on this machine; we use this elsewhere. If you think that's
> a problem I can rebuild for this machine without it.
> 
> Attached are various bits of information requested in REPORTING-BUGS.
> I'm not entirely sure what else is relevant. I'm happy to supply any
> other information and test things, just let me know.
> 
> Thanks,
> Rob.


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