linux-kernel - Re: WARNING: CPU: 2 PID: 7 at kernel/workqueue.c:2041 process_one

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Message-ID: <20170613205938.GC7359@htj.duckdns.org>
Date:   Tue, 13 Jun 2017 16:59:38 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Abdul Haleem <abdhalee@...ux.vnet.ibm.com>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        mpe <mpe@...erman.id.au>, sachinp <sachinp@...ux.vnet.ibm.com>
Subject: Re: WARNING: CPU: 2 PID: 7 at kernel/workqueue.c:2041
 process_one_work

On Tue, May 30, 2017 at 01:24:06PM +0530, Abdul Haleem wrote:
> Hi,
> 
> Test : stress-ng
> Machine : Power 8 Bare Metal
> Kernel : 4.12.0-rc3
> Config : attached
> gcc version: 4.8.5
> 
> 
> In file kernel/workqueue.c at line 2041
> 
>     /* ensure we're on the correct CPU */
>     WARN_ON_ONCE(!(pool->flags & POOL_DISASSOCIATED) &&
>              raw_smp_processor_id() != pool->cpu);
> 
> 
> WARN_ON_ONCE() is being triggered on Linus mainline kernel (4.12.0-rc3)
> when running stress-ng test.
> 
> 
> request_module: runaway loop modprobe net-pf-10
> request_module: runaway loop modprobe net-pf-10
> hrtimer: interrupt took 500359 ns
> RT Watchdog Timeout (hard): stress-ng-rlimi[80236]

Paul and Steven reported the same problem a while back.  Debugging on
the following thread.

 http://lkml.kernel.org/r/<20170501165747.GA993@...ux.vnet.ibm.com>

Thanks.

-- 
tejun