linux-kernel - [2.6.35.x regression] rcu_preempt_state stall warning and machine slow-downs

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Message-Id: <201009010847.20236.ml_kernel@mortal-soul.de>
Date:	Wed, 1 Sep 2010 08:47:19 +0200
From:	Matthias Dahl <ml_kernel@...tal-soul.de>
To:	linux-kernel@...r.kernel.org
Subject: [2.6.35.x regression] rcu_preempt_state stall warning and machine slow-downs

Hi.

I've a recurring problem w/ kernel 2.6.35.x that I cannot pinpoint exactly but
seems to be related to rcu_preempt_state stall warnings I get frequently.

From time to time, the machine slows down to an almost halt (meaning jumpy or
non-responsive mouse cursor, unable to switch to text console, ...) which can
also result in a complete hang w/o any way to recover.   Sometimes the system
catches up again but once this happened,  the system is sluggish and a reboot
is required nevertheless. High load seems to help a lot to trigger this issue.

In every instance, I found stall warnings in my log which might be related. I
have attached three of them along with my config and dmesg.

The system works flawlessly with pre-2.6.35 kernels-  no stall warnings and no
slow-downs at all.

If there is anything I can do to help further diagnose this problem, please let
me know.

So long,
matthias.

PS. Please cc' me because I am not subscribed to the list. Thanks a lot.

Download attachment "config.gz" of type "application/x-gzip" (13554 bytes)

Download attachment "backtrace2.gz" of type "application/x-gzip" (3572 bytes)

Download attachment "backtrace1.gz" of type "application/x-gzip" (3737 bytes)

Download attachment "backtrace3.gz" of type "application/x-gzip" (3630 bytes)

Download attachment "dmesg.gz" of type "application/x-gzip" (11974 bytes)