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

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Date:	Fri, 21 Nov 2008 00:23:18 -0500
From:	Valdis.Kletnieks@...edu
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	penguin-kernel@...ove.sakura.ne.jp, linux-kernel@...r.kernel.org
Subject: Re: Random freeze (Re: mmotm 2008-11-19-02-19 uploaded)

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...

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