On 4/2/19 4:55 PM, Nicholas Piggin wrote:
> Using a jiffies timer creates a dependency on the tick_do_timer_cpu
> incrementing jiffies. If that CPU has locked up and jiffies is not
> incrementing, the watchdog heartbeat timer for all CPUs stops and
> creates false positives and confusing warnings on local CPUs, and
> also causes the SMP detector to stop, so the root cause is never
> detected.
>
> Fix this by using hrtimer based timers for the watchdog heartbeat,
> like the generic kernel hardlockup detector.
>
> Reported-by: Ravikumar Bangoria <ravi.bango...@in.ibm.com>
Reported-by: Ravi Bangoria <ravi.bango...@linux.ibm.com>
Thanks,
Ravi
