linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <CA+55aFyju-xwqQpVTA+yNPdfjgYLWdCxMLNwVywLN+W5hj_Bsg@mail.gmail.com>
Date:	Tue, 2 Dec 2014 09:08:53 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dâniel Fraga <fragabr@...il.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On Tue, Dec 2, 2014 at 8:43 AM, Dâniel Fraga <fragabr@...il.com> 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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