linux-kernel - Re: rcu_kthread hang on 3.0.0-rc1-next-20110602

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Message-ID: <loom.20110604T081231-613@post.gmane.org>
Date:	Sat, 4 Jun 2011 06:17:50 +0000 (UTC)
From:	Manuel Lauss <manuel.lauss@...glemail.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: rcu_kthread hang on 3.0.0-rc1-next-20110602

Hello,

Markus Hästbacka <mhastbacka <at> gmail.com> writes:
> If I
> run dmesg  the computer hangs for 15 minutes, and I cannot even login at this
time, if I leave top (the top
> window updates very slowly, like every 5 minutes during this period) running I
can see that the process
> rcu_kthread takes 100% CPU, the computer load average is at around 10.

> but for example the last time I got the hang, I didn't get this error, nor any
other error for that matter.
> 
> The OS is installed on a CF-card. The computer is a eBox computer with VIA
Nehemiah CPU, 256MB RAM.
> 
> what more information do you need? Or what more can I test?

I too experience this weird 15 to 20-minute hang, but only on non-preempt
uniprocessor kernels; it still responds to pings, though.
With either preempt or SMP enabled it's not as visible or simply gone.

Manuel


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