Subject: Re: [BUG,2.6.29-rc7,s390] System goes into endless loop during
	boot or logon
From: Jan Glauber <jang@linux.vnet.ibm.com>
To: Frans Pop <elendil@planet.nl>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, linux-s390@vger.kernel.org,
       Hendrik Brueckner <brueckner@linux.vnet.ibm.com>,
       Ingo Molnar <mingo@elte.hu>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
In-Reply-To: <200903091025.53284.elendil@planet.nl>
References: <200903080835.14032.elendil@planet.nl>
	 <200903090253.34173.elendil@planet.nl> <1236587118.8389.20.camel@laptop>
	 <200903091025.53284.elendil@planet.nl>
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Date: Thu, 12 Mar 2009 15:28:06 +0000
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On Mon, 2009-03-09 at 10:25 +0100, Frans Pop wrote:
> On Monday 09 March 2009, you 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?
> 
> I'm afraid I have no idea.
> 
> AFAICT s390 does not have an NMI watchdog. And I have no idea how I could 
> trigger a sysrq given that I can't login and only have a dumb console or 
> SSH session to work with anyway.

You can try to trigger sysrq by ^-, so to get the task view type: .^-t

Cheers, Jan

> Maybe the people on the linux-s390 list have some suggestions, or even the 
> Hercules developers?
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