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Groups > linux.kernel > #1702662
| From | Pratyush Anand <panand@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: rcu_sched stall while waiting in csd_lock_wait() |
| Date | 2017-08-03 06:00 +0200 |
| Message-ID | <uafsK-2FW-5@gated-at.bofh.it> (permalink) |
| References | <u9SFQ-4t7-7@gated-at.bofh.it> <u9WT8-7j8-17@gated-at.bofh.it> <u9XvQ-7wU-17@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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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rcu_sched stall while waiting in csd_lock_wait() Pratyush Anand <panand@redhat.com> - 2017-08-02 05:40 +0200
Re: rcu_sched stall while waiting in csd_lock_wait() Will Deacon <will.deacon@arm.com> - 2017-08-02 10:10 +0200
Re: rcu_sched stall while waiting in csd_lock_wait() Marc Zyngier <marc.zyngier@arm.com> - 2017-08-02 10:50 +0200
Re: rcu_sched stall while waiting in csd_lock_wait() Pratyush Anand <panand@redhat.com> - 2017-08-03 06:00 +0200
Re: rcu_sched stall while waiting in csd_lock_wait() Pratyush Anand <panand@redhat.com> - 2017-08-03 06:00 +0200
Re: rcu_sched stall while waiting in csd_lock_wait() Marc Zyngier <marc.zyngier@arm.com> - 2017-08-03 09:20 +0200
Re: rcu_sched stall while waiting in csd_lock_wait() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-08-03 15:00 +0200
Re: rcu_sched stall while waiting in csd_lock_wait() Peter Zijlstra <peterz@infradead.org> - 2017-08-02 10:20 +0200
Re: rcu_sched stall while waiting in csd_lock_wait() Pratyush Anand <panand@redhat.com> - 2017-08-03 06:00 +0200
Re: rcu_sched stall while waiting in csd_lock_wait() Peter Zijlstra <peterz@infradead.org> - 2017-08-03 10:40 +0200
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