linux-kernel - Re: WARNING in vkms_vblank

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Date:   Mon, 11 Mar 2019 14:06:42 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+0871b14ca2e2fb64f6e3@...kaller.appspotmail.com>,
        shayenneluzmoura@...il.com,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        mahesh1.kumar@...el.com,
        Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
        Sean Paul <seanpaul@...omium.org>,
        Haneen Mohammed <hamohammed.sa@...il.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        DRI <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: WARNING in vkms_vblank_simulate

On Mon, Mar 11, 2019 at 1:28 PM syzbot
<syzbot+0871b14ca2e2fb64f6e3@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this bug to:
>
> commit 09ef09b4ab95dc405ad4171ec2cd8a4ff5227108
> Author: Shayenne Moura <shayenneluzmoura@...il.com>
> Date:   Wed Feb 6 20:08:13 2019 +0000
>
>      drm/vkms: WARN when hrtimer_forward_now fails

+Shayenne

This should have been included the author email when mailed by the
bot. This should be fixed now, tests added. Sorry for the churn.


> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=128448cf200000
> start commit:   09ef09b4 drm/vkms: WARN when hrtimer_forward_now fails
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=118448cf200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=168448cf200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c1e0e0ec44d1e5ff
> dashboard link: https://syzkaller.appspot.com/bug?extid=0871b14ca2e2fb64f6e3
> userspace arch: amd64
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1787db8d200000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17fc9883200000
>
> Reported-by: syzbot+0871b14ca2e2fb64f6e3@...kaller.appspotmail.com
> Fixes: 09ef09b4 ("drm/vkms: WARN when hrtimer_forward_now fails")
>
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