On Mon, Mar 31, 2014 at 05:48:01PM -0700, Paul E. McKenney wrote:
> Alternatively, I suppose a wakeup could be getting lost. The main change
> related to that this merge window was ffa83fb565fb, which eliminated
> idle wakeups from RCU in the CONFIG_RCU_NOCB_CPU_ALL=y case.
>
> So, could you please try reverting ffa83fb565fb?
Did a run overnight with that reverted, no luck..
[11869.580161] INFO: rcu_preempt detected stalls on CPUs/tasks:
[11869.581245] (detected by 0, t=6502 jiffies, g=449892, c=449891, q=0)
[11869.582047] INFO: Stall ended before state dump start
[12064.517461] INFO: rcu_preempt detected stalls on CPUs/tasks:
[12064.518539] (detected by 0, t=26007 jiffies, g=449892, c=449891, q=0)
[12064.519347] INFO: Stall ended before state dump start
[12259.454767] INFO: rcu_preempt detected stalls on CPUs/tasks:
[12259.455818] (detected by 0, t=45512 jiffies, g=449892, c=449891, q=0)
[12259.456602] INFO: Stall ended before state dump start
[12454.392112] INFO: rcu_preempt detected stalls on CPUs/tasks:
[12454.393131] (detected by 0, t=65017 jiffies, g=449892, c=449891, q=0)
[12454.393942] INFO: Stall ended before state dump start
[12649.329446] INFO: rcu_preempt detected stalls on CPUs/tasks:
[12649.330446] (detected by 0, t=84522 jiffies, g=449892, c=449891, q=0)
[12649.331267] INFO: Stall ended before state dump start
[12844.266776] INFO: rcu_preempt detected stalls on CPUs/tasks:
[12844.267695] (detected by 0, t=104027 jiffies, g=449892, c=449891, q=0)
[12844.268571] INFO: Stall ended before state dump start
[13039.204102] INFO: rcu_preempt detected stalls on CPUs/tasks:
[13039.205119] (detected by 0, t=123532 jiffies, g=449892, c=449891, q=0)
[13039.205871] INFO: Stall ended before state dump start
[13234.141424] INFO: rcu_preempt detected stalls on CPUs/tasks:
[13234.141424] INFO: rcu_preempt detected stalls on CPUs/tasks:
[13234.142448] (detected by 0, t=143037 jiffies, g=449892, c=449891, q=0)
[13234.143339] INFO: Stall ended before state dump start
[13429.078730] INFO: rcu_preempt detected stalls on CPUs/tasks:
[13429.079771] (detected by 0, t=162542 jiffies, g=449892, c=449891, q=0)
[13429.080591] INFO: Stall ended before state dump start
[13624.016058] INFO: rcu_preempt detected stalls on CPUs/tasks:
[13624.017116] (detected by 0, t=182047 jiffies, g=449892, c=449891, q=0)
[13624.018033] INFO: Stall ended before state dump start
[13818.953370] INFO: rcu_preempt detected stalls on CPUs/tasks:
[13818.954437] (detected by 0, t=201552 jiffies, g=449892, c=449891, q=0)
[13818.955334] INFO: Stall ended before state dump start
[14013.890682] INFO: rcu_preempt detected stalls on CPUs/tasks:
[14013.891761] (detected by 0, t=221057 jiffies, g=449892, c=449891, q=0)
[14013.892691] INFO: Stall ended before state dump start
[14208.827993] INFO: rcu_preempt detected stalls on CPUs/tasks:
[14208.829088] (detected by 0, t=240562 jiffies, g=449892, c=449891, q=0)
[14208.829977] INFO: Stall ended before state dump start
[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.
> 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.
Dave
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