Re: [sched] WARNING: CPU: 0 PID: 10 at kernel/kthread.c:333 __kthread_bind_mask()
From: Peter Zijlstra
Date: Thu Jun 04 2015 - 05:40:14 EST
On Thu, Jun 04, 2015 at 12:54:50PM +0800, Fengguang Wu wrote:
> [ 2.442390] ------------[ cut here ]------------
> [ 2.443944] WARNING: CPU: 0 PID: 10 at kernel/kthread.c:333 __kthread_bind_mask+0x34/0x6e()
> [ 2.446978] Modules linked in:
> [ 2.448359] CPU: 0 PID: 10 Comm: khelper Not tainted 4.1.0-rc6-00314-g6455666 #4
> [ 2.450990] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
> [ 2.454132] 0000000000000009 ffff88000f643d68 ffffffff81a3df14 0000000000000b02
> [ 2.470295] 0000000000000000 ffff88000f643da8 ffffffff810f308f 000000000f643da8
> [ 2.503291] ffffffff8110d116 ffff88000f55d580 ffff88000f5240c0 ffff88000f4936e0
> [ 2.506510] Call Trace:
> [ 2.520770] [<ffffffff81a3df14>] dump_stack+0x4c/0x65
> [ 2.522479] [<ffffffff810f308f>] warn_slowpath_common+0xa1/0xbb
> [ 2.524334] [<ffffffff8110d116>] ? __kthread_bind_mask+0x34/0x6e
> [ 2.526219] [<ffffffff810f314c>] warn_slowpath_null+0x1a/0x1c
> [ 2.528069] [<ffffffff8110d116>] __kthread_bind_mask+0x34/0x6e
> [ 2.529925] [<ffffffff8110d381>] kthread_bind_mask+0x13/0x15
> [ 2.531738] [<ffffffff8110679d>] worker_attach_to_pool+0x39/0x7c
> [ 2.546650] [<ffffffff8110866b>] rescuer_thread+0x130/0x318
Ah, I clearly missed that the rescuer_thread() also did
worker_attach_to_pool() from a !virgin kthread.
Thanks
> [ 2.548484] [<ffffffff8110853b>] ? cancel_delayed_work_sync+0x15/0x15
> [ 2.550411] [<ffffffff8110853b>] ? cancel_delayed_work_sync+0x15/0x15
> [ 2.552207] [<ffffffff8110cd0f>] kthread+0xf8/0x100
> [ 2.553864] [<ffffffff8110cc17>] ? kthread_create_on_node+0x184/0x184
> [ 2.555795] [<ffffffff81a457c2>] ret_from_fork+0x42/0x70
> [ 2.557538] [<ffffffff8110cc17>] ? kthread_create_on_node+0x184/0x184
> [ 2.572520] ---[ end trace 362b92c9255ab666 ]---
> [ 2.574163] ------------[ cut here ]------------
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