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

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Message-Id: <200903091046.58973.elendil@planet.nl>
Date:	Mon, 9 Mar 2009 10:46:57 +0100
From:	Frans Pop <elendil@...net.nl>
To:	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-s390@...r.kernel.org, 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, Hendrik Brueckner wrote:
> On Mon, Mar 09, 2009 at 10:25:51AM +0100, Frans Pop wrote:
> > > 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.
>
> If SSH works,  try to trigger the sysrq function trough
> /proc/sysrq-trigger, e.g.  echo l > /proc/sysrq-trigger

Yeah, I'm aware of that. Problem is that the loop starts when I try to log 
in over SSH. I do get the welcome message, but I never get a prompt. And 
as soon as the loop starts, the system is completely unresponsive. Even a 
shutdown triggered from the system console does nothing. Only thing I can 
do is a hard "poweroff".
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