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

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Message-Id: <A0A243A9-9097-4EEA-B3EF-1D09C925AC81@gmail.com>
Date:	Sat, 4 Jun 2011 18:41:43 +0300
From:	Markus Hästbacka <mhastbacka@...il.com>
To:	Manuel Lauss <manuel.lauss@...glemail.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: rcu_kthread hang on 3.0.0-rc1-next-20110602

Hi!

I compiled the kernel with preempt and the problem is indeed gone, the hd errors are still present from time to time, but thats probably a hardware problem.

M

On Jun 4, 2011, at 9:17 AM, Manuel Lauss wrote:

> 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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