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From: Kay Sievers <kay.sievers@vrfy.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Frank Sorenson <frank@tuxrocks.com>,
	Matt_Domsch@dell.com, LKML <linux-kernel@vger.kernel.org>,
	linux-mm@kvack.org, "Rafael J. Wysocki" <rjw@sisk.pl>,
	Greg Kroah-Hartman <gregkh@suse.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [patch] revert "dcdbas: add DMI-based module autloading"
Date: Sat, 08 Mar 2008 19:16:12 +0100	[thread overview]
Message-ID: <1205000172.8748.4.camel@lov.site> (raw)
In-Reply-To: <20080308082243.GA18123@elte.hu>

On Sat, 2008-03-08 at 09:22 +0100, Ingo Molnar wrote:
> * Frank Sorenson <frank@tuxrocks.com> wrote:
> 
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> > 
> > Frank Sorenson wrote:
> > > I did some additional debugging, and I believe you're correct about it
> > > being specific to my system.  The system seems to run fine until some
> > > time during the boot.  I booted with "init=/bin/sh" (that's how the
> > > system stayed up for 9 minutes), then it died when I tried starting
> > > things up.  I've further narrowed the OOM down to udev (though it's not
> > > entirely udev's fault, since 2.6.24 runs fine).
> > > 
> > > I ran your debug info tool before killing the box by running
> > > /sbin/start_udev.  The output of the tool is at
> > > http://tuxrocks.com/tmp/cfs-debug-info-2008.03.06-14.11.24
> > > 
> > > Something is apparently happening between 2.6.24 and 2.6.25-rc[34] which
> > > causes udev (or something it calls) to behave very badly.
> > 
> > Found it.  The culprit is 8f47f0b688bba7642dac4e979896e4692177670b
> >     dcdbas: add DMI-based module autloading
> > 
> >     DMI autoload dcdbas on all Dell systems.
> > 
> >     This looks for BIOS Vendor or System Vendor == Dell, so this should
> >     work for systems both Dell-branded and those Dell builds but brands
> >     for others.  It causes udev to load the dcdbas module at startup,
> >     which is used by tools called by HAL for wireless control and
> >     backlight control, among other uses.
> > 
> > What actually happens is that when udev loads the dcdbas module at 
> > startup, modprobe apparently calls "modprobe dcdbas" itself, repeating 
> > until the system runs out of resources (in this case, it OOMs).
> 
> nice work! I've attached the revert below against latest -git - just in 
> case no-one can think of an obvious fix to this bug.

Frank, can you grep for 'dcdbas' in the modprobe config files:
  modprobe -c | grep dcdbas
?

I wonder what's going on here, that modprobe calls itself.

Thanks,
Kay


  reply	other threads:[~2008-03-08 18:16 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-06 17:26 2.6.25-rc4 OOMs itself dead on bootup Frank Sorenson
2008-03-06 18:49 ` Ingo Molnar
2008-03-07 19:27   ` Frank Sorenson
2008-03-08  7:08     ` Frank Sorenson
2008-03-08  8:22       ` [patch] revert "dcdbas: add DMI-based module autloading" Ingo Molnar
2008-03-08 18:16         ` Kay Sievers [this message]
2008-03-08 18:57           ` Frank Sorenson
2008-03-08 13:53       ` 2.6.25-rc4 OOMs itself dead on bootup (modprobe bug?) Matt Domsch
2008-03-08 14:03         ` Frank Sorenson
2008-03-08 21:53           ` Jon Masters
2008-03-08 22:54             ` Kay Sievers
2008-03-09  3:41               ` Jon Masters

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