linux-kernel - Re: INFO: task hung in fb

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Date:   Thu, 05 Dec 2019 05:38:01 -0800
From:   syzbot <syzbot+a4ae1442ccc637162dc1@...kaller.appspotmail.com>
To:     airlied@...ux.ie, ayan.halder@....com, b.zolnierkie@...sung.com,
        daniel.vetter@...ll.ch, dri-devel@...ts.freedesktop.org,
        kraxel@...hat.com, linux-arm-kernel@...ts.infradead.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        maarten.lankhorst@...ux.intel.com, maxime.ripard@...tlin.com,
        peda@...ntia.se, sam@...nborg.org, syzkaller-bugs@...glegroups.com,
        ville.syrjala@...ux.intel.com, wens@...e.org
Subject: Re: INFO: task hung in fb_open

syzbot has bisected this bug to:

commit 979c11ef39cee79d6f556091a357890962be2580
Author: Ayan Kumar Halder <ayan.halder@....com>
Date:   Tue Jul 17 17:13:46 2018 +0000

     drm/sun4i: Substitute sun4i_backend_format_is_yuv() with format->is_yuv

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15d2f97ee00000
start commit:   596cf45c Merge branch 'akpm' (patches from Andrew)
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13d2f97ee00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7d8ab2e0e09c2a82
dashboard link: https://syzkaller.appspot.com/bug?extid=a4ae1442ccc637162dc1
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14273edae00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15e7677ae00000

Reported-by: syzbot+a4ae1442ccc637162dc1@...kaller.appspotmail.com
Fixes: 979c11ef39ce ("drm/sun4i: Substitute sun4i_backend_format_is_yuv()  
with format->is_yuv")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection