linux-kernel - Re: getting uninterruptible sleep processes after upgrade from 2.6.20.20 to 2.6.24.2

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Date:	Sun, 17 Feb 2008 12:54:07 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	allied internet ag- Stefan Priebe <s.priebe@...ied-internet.ag>
Cc:	Christian Kujau <lists@...dbynature.de>,
	LKML <linux-kernel@...r.kernel.org>, jirislaby@...il.com
Subject: Re: getting uninterruptible sleep processes after upgrade from
 2.6.20.20 to 2.6.24.2

On Sun, 17 Feb 2008 21:49:10 +0100
allied internet ag- Stefan Priebe <s.priebe@...ied-internet.ag> wrote:

>  >> One week ago we upgraded about 300 servers from 2.6.20.20 to
>  >> 2.6.24.2.
>  >
>  > Painfull.
> 
> OK not really - i've tested the new kernel on all models. And it
> works fine... the DN state only comes sometimes - absolutely not
> reproducable. So my tests went OK and then we've done the update.
> I've now seen 5 servers in 7 days having this problem.
> 
>  >> Now we get sometimes dozent of processes in state DN. The system
>  >> is completely idle - but the load is 20 or 90 or whatever. And it
>  >> can only be "repaired" by rebooting the system.
>  >
>  > please post sysrq-t (echo t > /proc/sysrq-trigger) output.
> Sorry what key is sysrq? Can i also do this via SSH Console?

just do the echo above and it'll have the same effect as the key, and yes
you can do this via ssh just fine (I do that all the time)


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