linux-kernel - Re: 2.6.21-rc2-git3 soft lockup detected on CPU#0 (crash dump kernel)

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Date:	Mon, 5 Mar 2007 13:21:05 +0100
From:	"Michal Piotrowski" <michal.k.k.piotrowski@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Thomas Gleixner" <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.21-rc2-git3 soft lockup detected on CPU#0 (crash dump kernel)

On 05/03/07, Michal Piotrowski <michal.k.k.piotrowski@...il.com> wrote:
> On 05/03/07, Ingo Molnar <mingo@...e.hu> wrote:
> >
> > * Michal Piotrowski <michal.k.k.piotrowski@...il.com> wrote:
> >
> > > >also below is a softlockup-debug patch that might be useful, which adds
> > > >a tick/tock output so it spams the console once per second but can show
> > > >the dynamics of lockups (and other delays).
> > >
> > > I have applied this patch
> > > http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/2.6.21-rc2-git3-kdump/log3.txt
> >
> > thanks. It seems that the 'BUG: soft lockup detected' message does not
> > occur in this log though - and that there are bootup messages between
> > the two sysrq outputs:
> >
> > [  221.101833] skge eth1: disabling interface
> > [  228.740911] audit(1173094442.943:11): user pid=3245 uid=0
> > auid=4294967295 subj=system_u:system_r:hwclock_t:s0 msg='changing system
> > time: exe="/sbin/hwclock"
> > (hostname=?, addr=?, terminal=console res=success)'
> > [  233.148571] md: md1 in immediate safe mode
> >
> > plus there's trouble with irq 10:
> >
> > [  132.013194] irq 10: nobody cared (try booting with the "irqpoll" option)
> > [  132.072771] Disabling IRQ #10
> >
> > that prompted you to enable irqpoll, right?
>
> No. irqpoll is added by /etc/init.d/kdump script (FC6).
>
> > So am i right that without
> > irqpoll there's no lockup?
>
> I will check this.

I can confirm that without irqpoll everything works fine.
http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/2.6.21-rc2-git3-kdump/log4.txt

irqpoll is recommended as a command line option in Documentation/kdump/kdump.txt

Regards,
Michal

-- 
Michal K. K. Piotrowski
LTG - Linux Testers Group (PL)
(http://www.stardust.webpages.pl/ltg/)
LTG - Linux Testers Group (EN)
(http://www.stardust.webpages.pl/linux_testers_group_en/)
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