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SubjectRe: [BUG,2.6.29-rc7,s390] SOLVED -- System goes into endless loop during boot or logon
On Monday 09 March 2009, 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%.
> I've bisected this to the following set of three patches:
> commit ca109491f612aab5c8152207631c0444f63da97f
> Author: Peter Zijlstra <>
> Date: Tue Nov 25 12:43:51 2008 +0100
> hrtimer: removing all ur callback modes
> commit 37810659ea7d9572c5ac284ade272f806ef8f788
> hrtimer: removing all ur callback modes, fix hotplug
> commit a0a99b227da57f81319dd239bc4de811b0f530ec
> hrtimer: removing all ur callback modes, fix
> I've not tried to bisect between these patches as the last two are
> fixes. If needed I can do though.

Just for the record, this issue was solved with the following commit (that
also fixed the hang I saw during boot with 2.6.28):

commit 4fa81ed27781a12f6303b9263056635ae74e3e21
Author: Martin Schwidefsky <>
Date: Wed Mar 18 13:27:32 2009 +0100
[S390] __div64_31 broken for CONFIG_MARCH_G5

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