On Thu, Dec 5, 2019 at 2:38 PM syzbot
[off-list ref] wrote:

syzbot has bisected this bug to:

commit 979c11ef39cee79d6f556091a357890962be2580
Author: Ayan Kumar Halder [off-list ref]
Date:   Tue Jul 17 17:13:46 2018 +0000

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

Pretty sure your GCD machine is not using the sun4i driver. It's also
very far away from the code that's blowing up. bisect gone wrong?
-Daniel

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?xd2f97ee00000
start commit:   596cf45c Merge branch 'akpm' (patches from Andrew)
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?xd2f97ee00000
kernel config:  https://syzkaller.appspot.com/x/.config?x}8ab2e0e09c2a82
dashboard link: https://syzkaller.appspot.com/bug?extid¤ae1442ccc637162dc1
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x273edae00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?xe7677ae00000

Reported-by: syzbot+a4ae1442ccc637162dc1@syzkaller.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

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch