linux-kernel - Re: 2.6.22-rc6 spurious hangs

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Message-ID: <20070628150047.GA14494@elte.hu>
Date:	Thu, 28 Jun 2007 17:00:47 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Thomas Sattler <tsattler@....de>
Cc:	Oleg Nesterov <oleg@...sign.ru>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: 2.6.22-rc6 spurious hangs


* Thomas Sattler <tsattler@....de> wrote:

> >> As Ingo told me I run 'echo t > /proc/sysrq-trigger' this time. The
> >> corresponding part of my syslogs is attached, as well as my kernel config.
> > 
> > Could you try the patch below? It dumps some info when flush_workqueue()
> > hangs.
> 
> I'm compiling a patched kernel right now. As I wrote in my former mail 
> the whole thing not easy to trigger. So it can take some time to get 
> the info.

i'd suggest to increase CONFIG_LOG_BUF_SHIFT=17 to =20 in your .config - 
to make sure the full SysRq-t dump is captured when you do it.

	Ingo
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