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From:   Dmitry Vyukov <dvyukov@google.com>
Date:   Mon, 6 Aug 2018 13:58:25 +0200
Message-ID: <CACT4Y+ZY6u9qqx6FofECrAZ6TmbcqZ=b4GVwHsxV6hZtNsypgQ@mail.gmail.com>
Subject: Re: WARNING in try_charge
To:     Michal Hocko <mhocko@kernel.org>
Cc:     syzbot <syzbot+bab151e82a4e973fa325@syzkaller.appspotmail.com>,
        cgroups@vger.kernel.org, Johannes Weiner <hannes@cmpxchg.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux-MM <linux-mm@kvack.org>,
        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
        Vladimir Davydov <vdavydov.dev@gmail.com>
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On Mon, Aug 6, 2018 at 1:32 PM, Michal Hocko <mhocko@kernel.org> wrote:
> On Mon 06-08-18 04:27:02, syzbot wrote:
>> Hello,
>>
>> syzbot has tested the proposed patch and the reproducer did not trigger
>> crash:
>>
>> Reported-and-tested-by:
>> syzbot+bab151e82a4e973fa325@syzkaller.appspotmail.com
>>
>> Tested on:
>>
>> commit:         8c8399e0a3fb Add linux-next specific files for 20180806
>> git tree:       linux-next
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=1b6bc1781e49e93e
>> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
>> patch:          https://syzkaller.appspot.com/x/patch.diff?x=14fe18e2400000
>>
>> Note: testing is done by a robot and is best-effort only.
>
> OK, so this smells like a problem in the previous group oom changes. Or
> maybe it is not very easy to reproduce?

It's possible to ask syzbot to test on a particular tree/commit too.