linux-kernel - Re: [LKP] Re: [mm] 3e38e0aaca: WARNING:at_mm/memcontrol.c:#mem_cgroup

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Message-ID: <20200815124547.GA21072@intel.com>
Date:   Sat, 15 Aug 2020 20:45:47 +0800
From:   Philip Li <philip.li@...el.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     kernel test robot <lkp@...el.com>, Roman Gushchin <guro@...com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Dennis Zhou <dennis@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...nel.org>,
        Pekka Enberg <penberg@...nel.org>, Tejun Heo <tj@...nel.org>,
        "Tobin C. Harding" <tobin@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Waiman Long <longman@...hat.com>,
        Bixuan Cui <cuibixuan@...wei.com>,
        Michal Koutný <mkoutny@...e.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: Re: [LKP] Re: [mm] 3e38e0aaca:
 WARNING:at_mm/memcontrol.c:#mem_cgroup_alloc

On Fri, Aug 14, 2020 at 10:00:44AM -0700, Linus Torvalds wrote:
> On Fri, Aug 14, 2020 at 7:14 AM kernel test robot <lkp@...el.com> wrote:
> >
> > FYI, we noticed the following commit (built with gcc-9):
> >
> > commit: 3e38e0aaca9eafb12b1c4b731d1c10975cbe7974 ("mm: memcg: charge memcg percpu memory to the parent cgroup")
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> >
> >
> > in testcase: boot
> >
> > on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
> >
> > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> 
> This should have already been fixed by commit 9f457179244a ("mm:
> memcontrol: fix warning when allocating the root cgroup").
Thanks Linus for this info, usually the test bot checks the head
of fbc's branch to validate the bisection. If the head fixes
the issue, the bot shall not send out such fbc report. We will
double check this bisection process to resolve any logical issue.

> 
> But I forget what the syntax is to report that to the kernel test
> robot. Would it be possible for lkp automatically look for "Fixes:"
> tags, perhaps?
Got it, we will investigate this which should be quite helpful, e.g. if
we want to check whether an upstream commit had fixes in other
repo like linux-next.

Thanks

> 
>                  Linus
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