On Tue, Apr 01, 2014 at 08:30:32AM -0700, Paul E. McKenney wrote: > > [14403.765300] INFO: rcu_preempt detected stalls on CPUs/tasks: > > [14403.766405] (detected by 0, t=260067 jiffies, g=449892, c=449891, q=0) > > and on and on.. > > > > so kernel space still works like before, but userspace is locked up. > > Interesting. I suspect that if you reverted the rest of this merge > window's RCU patches, you would get the same result. > > > > If that doesn't work, I will need to put together some diagnostic > > patches. > > > Starting with the one below. > > > > bugger, I forgot to apply this last night. I'll do it on the next run. > > But let's see what this shows first.
[ 1173.923463] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1173.924457] (detected by 0, t=6502 jiffies, g=47728, c=47727, q=0) [ 1173.925199] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1368.859744] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1368.860754] (detected by 0, t=26007 jiffies, g=47728, c=47727, q=0) [ 1368.861559] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1563.796416] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1563.797426] (detected by 0, t=45512 jiffies, g=47728, c=47727, q=0) [ 1563.798293] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1758.733747] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1758.734725] (detected by 0, t=65017 jiffies, g=47728, c=47727, q=0) [ 1758.735526] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 1953.670944] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1953.671932] (detected by 0, t=84522 jiffies, g=47728, c=47727, q=0) [ 1953.672735] INFO: Stall ended before state dump start, gp_kthread state: 0x2 [ 2148.608132] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 2148.609140] (detected by 0, t=104027 jiffies, g=47728, c=47727, q=0) etc etc. Dave -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/