linux-kernel - Re: [2.6.21.1] soft lockup when removing netconsole module

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Message-ID: <20070526164934.GE11760@vanheusden.com>
Date:	Sat, 26 May 2007 18:49:35 +0200
From:	Folkert van Heusden <folkert@...heusden.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Parag Warudkar <parag.warudkar@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [2.6.21.1] soft lockup when removing netconsole module

> > > > 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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