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SubjectRe: WARNING: refcount bug in sctp_wfree
On Tue, Mar 10, 2020 at 02:39:01AM -0700, syzbot wrote:
> syzbot has bisected this bug to:
>
> commit fb041bb7c0a918b95c6889fc965cdc4a75b4c0ca
> Author: Will Deacon <will@kernel.org>
> Date: Thu Nov 21 11:59:00 2019 +0000
>
> locking/refcount: Consolidate implementations of refcount_t

I suspect this is just bisecting to here because it made the refcount
checks more strict?

-Kees

>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=117e9e91e00000
> start commit: 2c523b34 Linux 5.6-rc5
> git tree: upstream
> final crash: https://syzkaller.appspot.com/x/report.txt?x=137e9e91e00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=157e9e91e00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=a5295e161cd85b82
> dashboard link: https://syzkaller.appspot.com/bug?extid=cea71eec5d6de256d54d
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164b5181e00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166dd70de00000
>
> Reported-by: syzbot+cea71eec5d6de256d54d@syzkaller.appspotmail.com
> Fixes: fb041bb7c0a9 ("locking/refcount: Consolidate implementations of refcount_t")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

--
Kees Cook

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