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    SubjectRe: [BUG,2.6.28,s390] Fails to boot in Hercules S/390 emulator
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    On Wed, 2009-03-11 at 17:34 -0700, john stultz wrote:
    > I'm still a little baffled, but I figure I can try to reproduce this
    > myself. So I'm working setting up hercules environment here to see if I
    > can't trigger it. Any help with config or links to your environment
    > would be great.

    Ok. I've got this up and reproduced with the hercules emulator.

    A couple of interesting hints:
    * The issue seems to go away if we disable NO_HZ/dynticks in
    the .config

    * nohz=off does not affect the issue.

    * The issue also seems to go away if HZ is anything except 250

    * Commenting out clocksource_adjust(), which does the clock steering,
    seems to avoid the issue.

    * When the problem triggers we don't seem to transfer to the TOD clock,
    and the jiffies clocksource seems to be in use.

    * The jiffies clocksource mult value seems to be ever increasing, again
    pointing to something wrong in the clock steering.

    * Reverting both 6c9bacb41c10 and 5cd1c9c5cf30 against 2.6-git did not
    seem to help the issue, as originally reported. I also reverted
    49b5cf34727a as well just in case, and it didn't help either.


    That's about all I can get for today. I'm out of town until Monday, so
    I'll start digging back into it then.

    thanks
    -john




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