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SubjectRe: INFO: task hung in fb_open
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syzbot has bisected this bug to:

commit 979c11ef39cee79d6f556091a357890962be2580
Author: Ayan Kumar Halder <ayan.halder@arm.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@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

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