On 23/9/21 2:03 am, syzbot wrote:
syzbot suspects this issue was fixed by commit:
commit f671a691e299f58835d4660d642582bf0e8f6fda
Author: Desmond Cheong Zhi Xi <desmondcheongzx@xxxxxxxxx>
Date: Fri Jul 2 09:18:30 2021 +0000
fcntl: fix potential deadlocks for &fown_struct.lock
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15fa8017300000
start commit: 293837b9ac8d Revert "i915: fix remap_io_sg to verify the p..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=18fade5827eb74f7
dashboard link: https://syzkaller.appspot.com/bug?extid=8073030e235a5a84dd31
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=171390add00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10050553d00000
If the result looks correct, please mark the issue as fixed by replying with:
#syz fix: fcntl: fix potential deadlocks for &fown_struct.lock
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
#syz fix: fcntl: fix potential deadlocks for &fown_struct.lock
Think I got jumbled a bit when marking the dups. This bug shares the
same root cause as [1], and is fixed by the same patch. Nice that Syzbot
noticed.
Link: https://syzkaller.appspot.com/bug?extid=e6d5398a02c516ce5e70 [1]
