linux-kernel - Re: WARNING in ep_poll

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Message-ID: <CACT4Y+ZXBhNamhTYVW_9y_yUWRE+=rO8vdBF=m40kjqJQGY-gQ@mail.gmail.com>
Date:   Mon, 11 Mar 2019 14:45:46 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Roman Penyaev <rpenyaev@...e.de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, dbueso@...e.de,
        Jason Baron <jbaron@...mai.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: WARNING in ep_poll_callback

On Mon, Mar 11, 2019 at 2:37 PM Roman Penyaev <rpenyaev@...e.de> wrote:
>
> Hi Andrew,
>
> I thought "epoll: loosen irq safety in ep_poll_callback()" patch was
> removed from your tree, at least I got a notification on 9th of january,
> also I do not see it in the linux-next tree.
>
> Should I ignore this syzbot message?

If this was resolved we need to communicate it to syzbot one way or the other.
Since it was in linux-next, it won't even be able to do fix bisection.
So the bug will be open forever otherwise.

> --
> Roman
>
> On 2019-03-11 14:14, syzbot wrote:
> > syzbot has bisected this bug to:
> >
> > commit f92cacf118171208f62519d92502a8dd0341286d
> > Author: Roman Penyaev <rpenyaev@...e.de>
> > Date:   Tue Jan 8 01:15:44 2019 +0000
> >
> >     epoll: loosen irq safety in ep_poll_callback()
> >
> > bisection log:
> > https://syzkaller.appspot.com/x/bisect.txt?x=107ae15f200000
> > start commit:   f92cacf1 epoll: loosen irq safety in ep_poll_callback()
> > git tree:       linux-next
> > final crash:
> > https://syzkaller.appspot.com/x/report.txt?x=127ae15f200000
> > console output:
> > https://syzkaller.appspot.com/x/log.txt?x=147ae15f200000
> > kernel config:
> > https://syzkaller.appspot.com/x/.config?x=1521b074ff5a5bdf
> > dashboard link:
> > https://syzkaller.appspot.com/bug?extid=aea82bf9ee6ffd9a79d9
> > userspace arch: amd64
> > syz repro:
> > https://syzkaller.appspot.com/x/repro.syz?x=1776034b400000
> > C reproducer:
> > https://syzkaller.appspot.com/x/repro.c?x=14c2e580c00000
> >
> > Reported-by: syzbot+aea82bf9ee6ffd9a79d9@...kaller.appspotmail.com
> > Fixes: f92cacf1 ("epoll: loosen irq safety in ep_poll_callback()")
>
>
>