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

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Date:   Fri, 14 Aug 2020 10:00:44 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     kernel test robot <lkp@...el.com>
Cc:     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: [mm] 3e38e0aaca: WARNING:at_mm/memcontrol.c:#mem_cgroup_alloc

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").

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?

                 Linus