Messages in this thread | | | Subject | Re: [next-20180517][ppc] watchdog: CPU 88 self-detected hard LOCKUP @ update_cfs_group+0x30/0x150 | From | Abdul Haleem <> | Date | Tue, 29 May 2018 18:39:40 +0530 |
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On Mon, 2018-05-21 at 16:50 +1000, Nicholas Piggin wrote: > Ah, it's POWER8. > > I'm betting we have a bug with nohz timer offloading somewhere. > > I *think* we may have seen similar on P9 as well, but that may be > related to problems with stop states. > > Can you reproduce it easily? I'm thinking maybe adding some > tracepoints that track decrementer settings and interrupts, and > nohz offload activity might show something up.
Yes, the problem is reproducible consistently on our CI setup and today It triggered on 4.17.0-rc6 (mainline) too.
-- Regard's
Abdul Haleem IBM Linux Technology Centre
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