linux-kernel - Re: Random freeze (Re: mmotm 2008-11-19-02-19 uploaded)

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Date:	Fri, 21 Nov 2008 15:54:54 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	Valdis.Kletnieks@...edu
Cc:	nishimura@....nes.nec.co.jp,
	Andrew Morton <akpm@...ux-foundation.org>,
	penguin-kernel@...ove.sakura.ne.jp, linux-kernel@...r.kernel.org
Subject: Re: Random freeze (Re: mmotm 2008-11-19-02-19 uploaded)

Hi.

On Fri, 21 Nov 2008 00:23:18 -0500, Valdis.Kletnieks@...edu wrote:
> On Thu, 20 Nov 2008 15:20:54 PST, Andrew Morton said:
> 
> > The traditional cause of the above trace is that someone mucked up the
> > block/driver/irq-routing layer and we lost an IO completion.
> 
> Yes, that would explain all the symptoms and tracebacks - everybody comes
> to a screeching halt the next time they try to go to disk, while the actual
> disk drive is showing zero activity.
> 
> > It's also of course possible (but less common) that someone mucked up
> > the VFS.  It would be interesting to revert
> > do_mpage_readpage-dont-submit-lots-of-small-bios-on-boundary.patch.
> 
> I'm seeing an MTBF of about 2-3 hours when actually applying an I/O load to the
> system.  I'll try reverting that patch, and if it survives an entire day or
> two it will be pretty strong circumstantial evidence that patch is the culprit...
> 
Just FYI, I had seen similar errors with recent mmotms,
but current mmotm(2008-11-20-17-03) seems more stable in my environment.


Thanks,
Daisuke Nishimura.
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