On Thu, Aug 03, 2017 at 09:26:06AM +0530, Pratyush Anand wrote: > Hi Peter, > > On Wednesday 02 August 2017 01:44 PM, Peter Zijlstra wrote: > > On Wed, Aug 02, 2017 at 09:01:19AM +0530, Pratyush Anand wrote: > > > Hi, > > > > > > 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. > > > > I'm sitting on this patch: > > > > > > https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?h=locking/core&id=15377ef4fe0c86eb7fa1099575b2e86357d99e42 > > > > please give that a spin. > > Thanks for the pointer.
Seems like my brain misfired in any case. That's the OSQ lock not the CSD one ;-) Let me go stare at your traces with hopefully more wakefulness.
