Re: frequent lockups in 3.18rc4

[Linus Torvalds]

On Tue, Dec 2, 2014 at 8:43 AM, DÃniel Fraga <fragabr@xxxxxxxxx> wrote:
>
>         Linus, Paul and others, I finally got a call trace with
> only CONFIG_TREE_PREEMPT_RCU *disabled* using Paul's patch (to trigger
> it I compiled PHP with make -j8).

So just to verify:

Without CONFIG_PREEMPT, things work well for you?

But with CONFIG_PREEMPT, you are able to create the rcu_sched stalls
both with and without CONFIG_TREE_PREEMPT_RCU?

Correct?

> Dec  2 14:25:54 tux kernel: [ 8550.791697] INFO: rcu_sched detected stalls on CPUs/tasks: { 4} (detected by 0, t=60002 jiffies, g=112854, c=112853, q=0)

Paul?

                    Linus
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