linux-kernel - Re: [BUG,2.6.29-rc7,s390] System goes into endless loop during boot or logon

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Message-Id: <200903091643.13803.elendil@planet.nl>
Date:	Mon, 9 Mar 2009 16:43:11 +0100
From:	Frans Pop <elendil@...net.nl>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-s390@...r.kernel.org,
	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG,2.6.29-rc7,s390] System goes into endless loop during boot or logon

On Monday 09 March 2009, Peter Zijlstra wrote:
> On Mon, 2009-03-09 at 02:53 +0100, Frans Pop wrote:
> > Follow-up to an issue reported on the linux-s390 list, seen in the
> > Hercules S/390 emulator.
> >
> > On Sunday 08 March 2009, Frans Pop wrote:
> > > Well, not quite. It does boot successfully and I do get a login
> > > prompt. I can also login on the console or connect with SSH, but in
> > > both cases the system again gets into some loop before I actually
> > > get a shell prompt.
> >
> > During the bisection series the system would sometimes enter the loop
> > during the boot procedure, before I tried to logon. After it enters
> > the loop one processor just goes racing at 100%.
>
> Where? Do you have NMI watchdog output, or even sysrq-t?

Hmmm. Your commit log message for ca109491f612aab5c8152207631c0444f63da97f 
does explicitly mention the risk of an infinite loop, as does a comment 
in hrtimer_enqueue_reprogram().

Any chance the cause is there? Any way to test for that?

Cheers,
FJP
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