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    SubjectRe: [BUG] Softlockup detected with linux-2.6.14-rt6

    Wasn't this thread related to a real lock up? I thought Luca said that
    the stack trace came from his printer.

    I thought it might be related to the __delay troubles ..

    Daniel

    On Tue, 15 Nov 2005, Ingo Molnar wrote:

    >
    > * john cooper <john.cooper@timesys.com> wrote:
    >
    >> Ingo Molnar wrote:
    >>> * Luca Falavigna <dktrkranz@gmail.com> wrote:
    >>>> I found this softlockup bug involving arts daemon using a
    >>>> linux-2.6.14-rt6 kernel (with "Complete Preemption" and "Detect Soft
    >>>> Lockups" compiled in).
    >>>> This bug does not happen everytime: I was able to reproduce it only
    >>>> three times in a week. [...]
    >>>
    >>>
    >>> does this happen with -rt13 too? I have fixed a softlockup
    >>> false-positive in it.
    >>
    >> Just curious what the cause of the false positive was?
    >
    > the fix is below - we didnt reset the 'light' counter in the else
    > branch.
    >
    > Ingo
    >
    > Index: linux/kernel/softlockup.c
    > ===================================================================
    > --- linux.orig/kernel/softlockup.c
    > +++ linux/kernel/softlockup.c
    > @@ -90,7 +90,8 @@ void softlockup_tick(void)
    >
    > wake_up_process(per_cpu(watchdog_task, this_cpu));
    > per_cpu(timeout, this_cpu) = jiffies + msecs_to_jiffies(1000);
    > - }
    > + } else
    > + touch_light_softlockup_watchdog();
    >
    > if (per_cpu(print_timestamp, this_cpu) == timestamp)
    > return;
    > -
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