linux-kernel - Re: WARNING: bad unlock balance in rcu_lock

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Date:   Wed, 29 Apr 2020 23:15:02 -0700
From:   syzbot <syzbot+f9545ab3e9f85cd43a3a@...kaller.appspotmail.com>
To:     ebiggers@...nel.org, jack@...e.cz, 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: WARNING: bad unlock balance in rcu_lock_release

syzbot suspects this bug was fixed by commit:

commit 10476e6304222ced7df9b3d5fb0a043b3c2a1ad8
Author: Peter Zijlstra <peterz@...radead.org>
Date:   Fri Mar 13 08:56:38 2020 +0000

    locking/lockdep: Fix bad recursion pattern

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16d64bac100000
start commit:   7d194c21 Linux 5.4-rc4
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=6c03e4d33fa96d51
dashboard link: https://syzkaller.appspot.com/bug?extid=f9545ab3e9f85cd43a3a
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10a0a8c0e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13dd2dd8e00000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: locking/lockdep: Fix bad recursion pattern

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