linux-kernel - Re: [LKP] 3f906ba236 [ 71.192813] WARNING: possible circular locking dependency detected

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Date:   Wed, 5 Sep 2018 15:02:40 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     kernel test robot <rong.a.chen@...el.com>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [LKP] 3f906ba236 [ 71.192813] WARNING: possible circular locking
 dependency detected

On Wed, 5 Sep 2018, kernel test robot wrote:

> Greetings,
> 
> 0day kernel testing robot got the below dmesg and the first bad commit is
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> 
> commit 3f906ba23689a3f824424c50f3ae937c2c70f676
> Author:     Thomas Gleixner <tglx@...utronix.de>
> AuthorDate: Mon Jul 10 15:50:09 2017 -0700
> Commit:     Linus Torvalds <torvalds@...ux-foundation.org>
> CommitDate: Mon Jul 10 16:32:33 2017 -0700

So it identified a more than one year old commit. Great.

> vm86 returned ENOSYS, marking as inactive. 20044 iterations. [F:14867 S:5032 HI:3700] [ 57.651003] synth uevent: /module/pcmcia_core: unknown uevent action string [ 71.189062] [ 71.191953] ====================================================== [ 71.192813] WARNING: possible circular locking dependency detected [ 71.193664] 4.12.0-10480-g3f906ba #1 Not tainted [ 71.194355] ------------------------------------------------------ [ 71.195211] trinity-c0/1666 is trying to acquire lock: [ 71.195958] (mem_hotplug_lock.rw_sem){.+.+.+}, at: show_slab_objects+0x14b/0x440 [ 71.197284] [ 71.197284] but task is already holding lock:

along with completely unparseable information. What am I supposed to do
with this mail?

Thanks,

	tglx