linux-kernel - Re: BUG: Bad rss-counter state (3)

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Message-ID: <CACT4Y+ZU9Cznk6jPQ19LPUVch446EUbuj-_yW2ZoSt=6Z2B4YQ@mail.gmail.com>
Date:   Thu, 19 Apr 2018 09:58:40 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+f2a1633f249cece865fe@...kaller.appspotmail.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>, Linux-MM <linux-mm@...ck.org>
Subject: Re: BUG: Bad rss-counter state (3)

On Thu, Apr 19, 2018 at 9:54 AM, syzbot
<syzbot+f2a1633f249cece865fe@...kaller.appspotmail.com> wrote:
> Hello,
>
> syzbot hit the following crash on upstream commit
> a27fc14219f2e3c4a46ba9177b04d9b52c875532 (Mon Apr 16 21:07:39 2018 +0000)
> Merge branch 'parisc-4.17-3' of
> git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
> syzbot dashboard link:
> https://syzkaller.appspot.com/bug?extid=f2a1633f249cece865fe
>
> So far this crash happened 8 times on upstream.
> C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6258099799195648
> syzkaller reproducer:
> https://syzkaller.appspot.com/x/repro.syz?id=5162423375888384
> Raw console output:
> https://syzkaller.appspot.com/x/log.txt?id=4959118615904256
> Kernel config:
> https://syzkaller.appspot.com/x/.config?id=-5914490758943236750
> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+f2a1633f249cece865fe@...kaller.appspotmail.com
> It will help syzbot understand when the bug is fixed. See footer for
> details.
> If you forward the report, please keep this part and the footer.

+mm maintainers (syzbot wasn't able to find maintainers because there
is no stack trace and no file names to give to get_maintainers.pl)

There is a single-threaded reproducer, so should be an easy one.


> BUG: Bad rss-counter state mm:00000000d5737ed7 idx:1 val:1
> BUG: Bad rss-counter state mm:00000000d5737ed7 idx:3 val:-1
>
>
> ---
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
> Direct all questions to syzkaller@...glegroups.com.
>
> syzbot will keep track of this bug report.
> If you forgot to add the Reported-by tag, once the fix for this bug is
> merged
> into any tree, please reply to this email with:
> #syz fix: exact-commit-title
> If you want to test a patch for this bug, please reply with:
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