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SubjectRe: [syzbot] possible deadlock in f_getown
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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@gmail.com>
> 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]

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