linux-kernel - Re: [syzbot] possible deadlock in f

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Date:   Thu, 23 Sep 2021 13:54:17 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>,
        syzbot <syzbot+8073030e235a5a84dd31@...kaller.appspotmail.com>,
        asm@...rahospitality.com, bfields@...ldses.org,
        boqun.feng@...il.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        peterz@...radead.org, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk, will@...nel.org
Subject: Re: [syzbot] possible deadlock in f_getown

On Thu, 2021-09-23 at 13:20 -0400, Desmond Cheong Zhi Xi wrote:
> 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@...il.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]


Yeah, I had forgotten about that syzkaller report entirely.

I'm not sure we can do much about it now that the patch is already
merged though. Is there a process for amending changelogs for patches
already in Linus' tree?

If I had gotten this email while it was still sitting in linux-next, I
would have added that line. The syzkaller folks might want to consider
occasionally doing these sorts of checks vs. linux-next to catch this
sort of thing, if they care about the attribution.
-- 
Jeff Layton <jlayton@...nel.org>