From: Thomas Gleixner <tglx@linutronix.de>
To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>, Tejun Heo <tj@kernel.org>
Subject: Re: [bisected] "sched: Allow per-cpu kernel threads to run on online && !active" causes warning
Date: Wed, 27 Jul 2016 17:23:05 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.11.1607271717320.19896@nanos> (raw)
In-Reply-To: <20160727125412.GB3912@osiris>
On Wed, 27 Jul 2016, Heiko Carstens wrote:
> [ 3.162961] ([<0000000000176c30>] select_task_rq+0xc0/0x1a8)
> [ 3.162963] ([<0000000000177d64>] try_to_wake_up+0x2e4/0x478)
> [ 3.162968] ([<000000000015d46c>] create_worker+0x174/0x1c0)
> [ 3.162971] ([<0000000000161a98>] alloc_unbound_pwq+0x360/0x438)
> For some unknown reason select_task_rq() gets called with a task that has
> nr_cpus_allowed == 0. Hence "cpu = cpumask_any(tsk_cpus_allowed(p));"
> within select_task_rq() will set cpu to nr_cpu_ids which in turn causes the
> warning later on.
>
> It only happens with more than one node, otherwise it seems to work fine.
>
> Any idea what could be wrong here?
create_worker()
tsk = kthread_create_on_node();
kthread_bind_mask(tsk, pool->attrs->cpumask);
do_set_cpus_allowed(tsk, mask);
set_cpus_allowed_common(tsk, mask);
cpumask_copy(&tsk->cpus_allowed, mask);
tsk->nr_cpus_allowed = cpumask_weight(mask);
wake_up_process(task);
So this looks like pool->attrs->cpumask is simply empty.....
Thanks,
tglx
next prev parent reply other threads:[~2016-07-27 15:25 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-27 12:54 [bisected] "sched: Allow per-cpu kernel threads to run on online && !active" causes warning Heiko Carstens
2016-07-27 15:23 ` Thomas Gleixner [this message]
2016-07-30 11:25 ` Heiko Carstens
2016-08-08 7:45 ` Ming Lei
2016-08-15 11:19 ` Heiko Carstens
2016-08-15 22:48 ` Tejun Heo
2016-08-16 7:55 ` Heiko Carstens
2016-08-16 15:20 ` Tejun Heo
2016-08-16 15:29 ` Peter Zijlstra
2016-08-16 15:42 ` Tejun Heo
2016-08-16 22:19 ` Heiko Carstens
2016-08-17 9:20 ` Michael Holzheu
2016-08-17 13:58 ` Tejun Heo
2016-08-18 9:30 ` Michael Holzheu
2016-08-18 14:42 ` Tejun Heo
2016-08-19 9:52 ` Michael Holzheu
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