linux-kernel - system freezing with 3.0.4

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Date:	Fri, 09 Sep 2011 07:31:02 +0200
From:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-scsi@...r.kernel.org
Subject: system freezing with 3.0.4

Hi list,

here's an updated post of my one yesterday.

We've updated some systems from 2.6.32 to 3.0.4 vanilla kernel. Since 
then we're expecting freezes every now and then. All in memory apps are 
still working but nothing which reads or writes from or to disk (at 
least it seems like that).

If you're already conncted via ssh and running top suddenly idle is 
99-100% and loads goes up to 500. I then cannot write to disk anymore. 
I've seen this for now on 2-5 of 20 servers i've updated. I can't 
believe they are all damaged. Also every night there comes another one 
where the same happens. Also running them on 2.6.32 again works fine.

Luckily i was able to trigger a sysrq on one machine fast enough:
echo t >/proc/sysrq-trigger

sysrq output is attached

I hope somebody can help.

Please CC me i'm not on list.

Stefan

View attachment "sysrqtrigger.txt" of type "text/plain" (182569 bytes)