On Tue, Oct 14, 2014 at 10:35:10PM -0400, Sasha Levin wrote:
> On 10/13/2014 01:35 PM, Dave Jones wrote:
> > oday in "rcu stall while fuzzing" news:
> >
> > INFO: rcu_preempt detected stalls on CPUs/tasks:
> > Tasks blocked on level-0 rcu_node (CPUs 0-3): P766 P646
> > Tasks blocked on level-0 rcu_node (CPUs 0-3): P766 P646
> > (detected by 0, t=6502 jiffies, g=75434, c=75433, q=0)
>
> I've complained about RCU stalls couple days ago (in a different context)
> on -next. I guess whatever causing them made it into Linus's tree?
>
> https://lkml.org/lkml/2014/10/11/64
And on that one, I must confess that I don't see where the RCU read-side
critical section might be.
Hmmm... Maybe someone forgot to put an rcu_read_unlock() somewhere.
Can you reproduce this with CONFIG_PROVE_RCU=y?
Thanx, Paul
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