linux-kernel - Re: [Bug #32982] Kernel locks up a few minutes after boot

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Date:	Sun, 17 Apr 2011 20:37:39 +0200
From:	Bart Van Assche <bvanassche@....org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Florian Mickler <florian@...kler.org>,
	Neil Brown <neilb@...e.de>, Jens Axboe <jaxboe@...ionio.com>
Subject: Re: [Bug #32982] Kernel locks up a few minutes after boot

On Sun, Apr 17, 2011 at 7:03 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Sun, Apr 17, 2011 at 5:57 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > This message has been generated automatically as a part of a summary report
> > of recent regressions.
> >
> > The following bug entry is on the current list of known regressions
> > from 2.6.38.  Please verify if it still should be listed and let the tracking team
> > know (either way).
> >
> >
> > Bug-Entry       : http://bugzilla.kernel.org/show_bug.cgi?id=32982
> > Subject         : Kernel locks up a few minutes after boot
> > Submitter       : Bart Van Assche <bart.vanassche@...il.com>
> > Date            : 2011-04-10 19:55 (8 days old)
>
> Is this machine running a RAID5 setup or something like that?
>
> There is a known interaction with the new block layer plugging code
> and MD. The "hung task" report in that bugzilla looks very much like
> that issue. And you do have "root=/dev/md0", so clearly there's some
> md thing going on.
>
> And bisecting might not work all that well for it, because I suspect
> it ends up being very much a matter of IO patterns how it triggers.
>
> Neil supposedly has a patch for it, but I haven't seen it yet. Neil, Jens?

(converted top-posting into bottom-posting)

Hello Linus,

On the system on which bug #32982 has been triggered md0, md1 and md2
have been configured as two-disk RAID1 (mirroring).

I've done my best to trigger enough I/O in order to obtain reliable
bisect results. A difficulty I encountered during bisecting though was
that I encountered unbootable kernels (all skipped revisions).

Bart.
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