linux-kernel - Re: WARNING in try

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Message-ID: <20180806113212.GK19540@dhcp22.suse.cz>
Date:   Mon, 6 Aug 2018 13:32:12 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     syzbot <syzbot+bab151e82a4e973fa325@...kaller.appspotmail.com>
Cc:     cgroups@...r.kernel.org, dvyukov@...gle.com, hannes@...xchg.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        penguin-kernel@...ove.SAKURA.ne.jp,
        syzkaller-bugs@...glegroups.com, vdavydov.dev@...il.com
Subject: Re: WARNING in try_charge

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@...kaller.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?

-- 
Michal Hocko
SUSE Labs