From: Folkert van Heusden <folkert@vanheusden.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Parag Warudkar <parag.warudkar@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: [2.6.21.1] soft lockup when removing netconsole module
Date: Sat, 26 May 2007 18:49:35 +0200 [thread overview]
Message-ID: <20070526164934.GE11760@vanheusden.com> (raw)
In-Reply-To: <1180197324.4264.23.camel@chaos>
> > > > Seems to be hrtimers related - CC'ed Thomas.
> > > I doubt that. The tick interrupt just finds out, that the machine is
> > > stuck in rmmod.
> > > > > Also the rmmod hangs and would not exit even with kill -9. It also
> > > > > sucks up 100% cpu.
> > > Can you please enable CONFIG_PROVE_LOCKING ?
> > Luckily I already had :-)
> > Here is its output:
> So there is no output from lockdep, during the rmmod hang ? The rmmod
Nope, just other subsystems (nfs, usb) minutes before that.
> sucks 100% cpu, so it busy loops at some place. Looking at the stack
> trace this seems to be in:
> void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
> struct delayed_work *dwork)
> {
> while (!cancel_delayed_work(dwork))
> flush_workqueue(wq);
> }
> which is not really related to timers :)
Ok.
Folkert van Heusden
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next prev parent reply other threads:[~2007-05-26 16:49 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-26 15:40 [2.6.21.1] soft lockup when removing netconsole module Folkert van Heusden
2007-05-26 15:53 ` Parag Warudkar
2007-05-26 16:12 ` Thomas Gleixner
2007-05-26 16:17 ` Folkert van Heusden
2007-05-26 16:35 ` Thomas Gleixner
2007-05-26 16:49 ` Folkert van Heusden [this message]
2007-05-26 17:06 ` Thomas Gleixner
2007-05-26 17:12 ` Folkert van Heusden
2007-05-27 20:32 ` Matt Mackall
2007-05-29 7:56 ` Andrew Morton
2007-05-30 13:28 ` [PATCH] " Jason Wessel
2007-05-30 20:38 ` Folkert van Heusden
2007-06-12 11:02 ` Jarek Poplawski
2007-06-13 9:25 ` [PATCH] " Jarek Poplawski
2007-06-26 23:07 ` Andrew Morton
2007-06-27 0:46 ` Wessel, Jason
2007-06-27 1:00 ` Andrew Morton
2007-06-27 7:24 ` Jarek Poplawski
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