linux-kernel - RE: WARNING: CPU: 3 PID: 0 at kernel/cgroup/cgroup.c:441 cgroup

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Date:   Fri, 30 Jun 2017 07:31:06 -0400
From:   "Justin Piszcz" <jpiszcz@...idpixels.com>
To:     "'Cong Wang'" <xiyou.wangcong@...il.com>
Cc:     "'LKML'" <linux-kernel@...r.kernel.org>
Subject: RE: WARNING: CPU: 3 PID: 0 at kernel/cgroup/cgroup.c:441 cgroup_get+0x4b/0x50



> -----Original Message-----
> From: Cong Wang [mailto:xiyou.wangcong@...il.com]
> Sent: Thursday, June 29, 2017 9:44 PM
> To: Justin Piszcz
> Cc: LKML
> Subject: Re: WARNING: CPU: 3 PID: 0 at kernel/cgroup/cgroup.c:441
> cgroup_get+0x4b/0x50
> 
> On Thu, Jun 29, 2017 at 12:26 AM, Justin Piszcz <jpiszcz@...idpixels.com

[ snip ]

> >
> > [22606.516656] ------------[ cut here ]------------
> > [22606.516669] WARNING: CPU: 3 PID: 0 at kernel/cgroup/cgroup.c:441
> > cgroup_get+0x4b/0x50
> > [22606.516672] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 4.11.0 #1
> > [22606.516674] Hardware name: Supermicro X9SRL-F/X9SRL-F, BIOS 3.2
> > 01/16/2015
> > [22606.516676] Call Trace:
> > [22606.516678]  <IRQ>
> > [22606.516681]  dump_stack+0x4d/0x66
> > [22606.516684]  __warn+0xbc/0xe0
> > [22606.516686]  warn_slowpath_null+0x18/0x20
> > [22606.516687]  cgroup_get+0x4b/0x50
> > [22606.516689]  cgroup_sk_alloc+0x56/0x60
> 
> This should be fixed by:
> 
> commit a590b90d472f2c176c140576ee3ab44df7f67839
> Author: Tejun Heo <tj@...nel.org>
> Date:   Fri Apr 28 15:14:55 2017 -0400
> 
>     cgroup: fix spurious warnings on cgroup_is_dead() from cgroup_sk_alloc()
> 

Thank you, patch applied and in production!

Justin.