Messages in this thread | | | Subject | Re: rcu_sched stall while waiting in csd_lock_wait() | From | Pratyush Anand <> | Date | Thu, 3 Aug 2017 09:26:24 +0530 |
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Hi Marc,
On Wednesday 02 August 2017 02:14 PM, Marc Zyngier wrote: > On 02/08/17 09:08, Will Deacon wrote: >> Hi Pratyush, >> >> On Wed, Aug 02, 2017 at 09:01:19AM +0530, Pratyush Anand wrote: >>> I am observing following rcu_sched stall while executing `perf record -a -- >>> sleep 1` with one of the arm64 platform. It looks like that stalled cpu was >>> waiting in csd_lock_wait() from where it never came out,and so the stall. >>> Any help/pointer for further debugging would be very helpful. Problem also >>> reproduced with 4.13.0-rc3. >> >> When you say "also", which other kernel(s) show the problem? Is this a >> recent regression? Which platform are you running on? >> >> It would be interesting to know what the other CPUs are doing, in particular >> the target of the cross-call. Either it crashed spectacularly and didn't >> unlock the csd lock, or the IPI somehow wasn't delivered. >> >> Do you see any other splats if you enable lock debugging? > > Also, is that in a guest, or bare metal? If that's a guest, what's the > host's kernel version?
Its a host. -- Regards Pratyush
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