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    SubjectRe: RCU detected CPU 0 stall after panic on sparc64
    On Sat, Dec 12, 2009 at 01:40:02AM -0800, David Miller wrote:
    > From: Meelis Roos <>
    > Date: Sat, 12 Dec 2009 10:54:19 +0200 (EET)
    > > I tried 2.6.32 git gaad3bf0 on a SMP sparc64 machine (Ultra Enterprise
    > > 250). For some reason my disks were not found (not important in this
    > > bugreport) and this resulted in panic (cannnot mount root). However, the
    > > machine kept going and got the below messages (RCU detected CPU 0 stall
    > > (t=1000 jiffies)) from timer interrupts.
    > >
    > > This seems to be like a bug in RCU vs panic.
    > It's normal actually. A panic() just loops forever and the cpu never
    > goes through an RCU grace period again as a result, and this triggers
    > the debugging timer that detects this condition.
    > Probably the panic() code should disable that assertion check.

    Hmmm... At first glance, it looks like RCU should put a notifier onto
    the panic_notifier_list to disable this check. Or is there some global
    variable that I can check?

    Thanx, Paul

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