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SubjectRe: KASAN: slab-out-of-bounds Write in watch_queue_ioctl
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syzbot has bisected this bug to:

commit fe78d401ca6b3639385cf7a9a1597b9cd48f64eb
Author: David Howells <dhowells@redhat.com>
Date: Fri Oct 11 07:48:08 2019 +0000

General notification queue with user mmap()'able ring buffer

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1163cafee00000
start commit: fca4fe89 Add linux-next specific files for 20191217
git tree: linux-next
final crash: https://syzkaller.appspot.com/x/report.txt?x=1363cafee00000
console output: https://syzkaller.appspot.com/x/log.txt?x=1563cafee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=634b7ce01f79423d
dashboard link: https://syzkaller.appspot.com/bug?extid=5a774ffe70862ca9ebc7
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13df92fee00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1003cafee00000

Reported-by: syzbot+5a774ffe70862ca9ebc7@syzkaller.appspotmail.com
Fixes: fe78d401ca6b ("General notification queue with user mmap()'able ring
buffer")

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

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