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From: Tejun Heo <tj@kernel.org>
To: kernel test robot <oliver.sang@intel.com>
Cc: oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org
Subject: Re: [tj-wq:affinity-scopes-dbg-invalid-cpu] [workqueue] e3485721f9: WARNING:at_kernel/workqueue.c:#workqueue_online_cpu
Date: Mon, 12 Jun 2023 07:42:11 -1000	[thread overview]
Message-ID: <ZIdY8-aOIR3lQI3M@slm.duckdns.org> (raw)
In-Reply-To: <202306120920.a932842-oliver.sang@intel.com>

On Mon, Jun 12, 2023 at 10:04:02AM +0800, kernel test robot wrote:
> [    3.388228][   T21] ------------[ cut here ]------------
> [ 3.394990][ T21] WARNING: CPU: 1 PID: 21 at kernel/workqueue.c:5393 workqueue_online_cpu (kernel/workqueue.c:5393 kernel/workqueue.c:5481) 
...
> [ 3.584746][ T21] ? workqueue_prepare_cpu (kernel/workqueue.c:5470) 
> [ 3.591752][ T21] ? local_clock (kernel/sched/clock.c:270 kernel/sched/clock.c:307) 
> [ 3.596749][ T21] cpuhp_invoke_callback (arch/x86/include/asm/jump_label.h:27 include/linux/jump_label.h:207 include/trace/events/cpuhp.h:65 kernel/cpu.c:193) 
> [ 3.603751][ T21] ? try_to_wake_up (include/linux/sched.h:2254 kernel/sched/core.c:4312) 
> [ 3.610751][ T21] cpuhp_thread_fun (kernel/cpu.c:815) 

This is set_cpus_allowed_ptr() failing on kworkers when workqueue tries to
put back the per-cpu kworkers on the onlining CPU, which is rather
unexpected. Let me include the error code in the warning message so that we
can understand why it fails the next time.

Thanks.

-- 
tejun

  reply	other threads:[~2023-06-12 17:42 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-06-12  2:04 kernel test robot
2023-06-12 17:42 ` Tejun Heo [this message]
2023-06-12 17:43   ` Tejun Heo

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