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From: Daniel Jordan <daniel.m.jordan@oracle.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>,
	kernel test robot <lkp@intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@kernel.org>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	linux-kernel@vger.kernel.org, LKP <lkp@lists.01.org>,
	Tejun Heo <tj@kernel.org>, Lai Jiangshan <jiangshanlai@gmail.com>
Subject: Re: [PATCH v2] workqueue: Remove the warning in wq_worker_sleeping()
Date: Fri, 3 Apr 2020 15:05:51 -0400	[thread overview]
Message-ID: <20200403190551.mntw6ydtqysaoipu@ca-dmjordan1.us.oracle.com> (raw)
In-Reply-To: <20200403182502.woqrxpydt3n6l6ie@linutronix.de>

On Fri, Apr 03, 2020 at 08:25:02PM +0200, Sebastian Andrzej Siewior wrote:
> On 2020-04-03 13:45:00 [-0400], Daniel Jordan wrote:
> > Why would preemption prevent it?  Interrupts are still enabled.
> > 
> > What am I missing?  :-)
> 
> Preemption is disabled which means no other task is allowed to be
> scheduled.

Aha, "preempt_count() > 1" in kvm_async_pf_task_wait().

Thanks.

WARNING: multiple messages have this Message-ID (diff)
From: Daniel Jordan <daniel.m.jordan@oracle.com>
To: lkp@lists.01.org
Subject: Re: [PATCH v2] workqueue: Remove the warning in wq_worker_sleeping()
Date: Fri, 03 Apr 2020 15:05:51 -0400	[thread overview]
Message-ID: <20200403190551.mntw6ydtqysaoipu@ca-dmjordan1.us.oracle.com> (raw)
In-Reply-To: <20200403182502.woqrxpydt3n6l6ie@linutronix.de>

[-- Attachment #1: Type: text/plain, Size: 391 bytes --]

On Fri, Apr 03, 2020 at 08:25:02PM +0200, Sebastian Andrzej Siewior wrote:
> On 2020-04-03 13:45:00 [-0400], Daniel Jordan wrote:
> > Why would preemption prevent it?  Interrupts are still enabled.
> > 
> > What am I missing?  :-)
> 
> Preemption is disabled which means no other task is allowed to be
> scheduled.

Aha, "preempt_count() > 1" in kvm_async_pf_task_wait().

Thanks.

  reply	other threads:[~2020-04-03 19:05 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-27  7:43 6d25be5782 ("sched/core, workqueues: Distangle worker .."): [ 52.816697] WARNING: CPU: 0 PID: 14 at kernel/workqueue.c:882 wq_worker_sleeping kernel test robot
2020-03-27  7:43 ` kernel test robot
2020-03-27 17:53 ` [PATCH] workqueue: Don't double assign worker->sleeping Sebastian Andrzej Siewior
2020-03-27 17:53   ` Sebastian Andrzej Siewior
2020-03-27 23:29   ` [PATCH v2] workqueue: Remove the warning in wq_worker_sleeping() Sebastian Andrzej Siewior
2020-03-27 23:29     ` Sebastian Andrzej Siewior
2020-04-03 14:53     ` Tejun Heo
2020-04-03 14:53       ` Tejun Heo
2020-04-03 19:29       ` Sebastian Andrzej Siewior
2020-04-03 19:29         ` Sebastian Andrzej Siewior
2020-04-03 17:45     ` Daniel Jordan
2020-04-03 17:45       ` Daniel Jordan
2020-04-03 18:25       ` Sebastian Andrzej Siewior
2020-04-03 18:25         ` Sebastian Andrzej Siewior
2020-04-03 19:05         ` Daniel Jordan [this message]
2020-04-03 19:05           ` Daniel Jordan
2020-04-01  3:22   ` [PATCH] workqueue: Don't double assign worker->sleeping Lai Jiangshan
2020-04-01  3:44     ` Lai Jiangshan
2020-04-01 13:03       ` Sebastian Andrzej Siewior
2020-04-01 13:03         ` Sebastian Andrzej Siewior
2020-04-02  0:07         ` Lai Jiangshan
2020-04-02  7:29           ` Sebastian Andrzej Siewior
2020-04-02  7:29             ` Sebastian Andrzej Siewior
2020-04-08 12:20 ` [tip: sched/urgent] workqueue: Remove the warning in wq_worker_sleeping() tip-bot2 for Sebastian Andrzej Siewior

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