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

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Date:	Sat, 26 May 2007 19:06:28 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Folkert van Heusden <folkert@...heusden.com>
Cc:	Parag Warudkar <parag.warudkar@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [2.6.21.1] soft lockup when removing netconsole module

On Sat, 2007-05-26 at 18:49 +0200, Folkert van Heusden wrote:
> > > > > 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.

Hmm. Can you provide the output of that ? Might be some stale stuff
leading to the hang later.

	tglx


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