linux-kernel - Re: WARNING: bad unlock balance detected! (3)

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Date:   Tue, 26 Mar 2019 09:30:18 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Jerome Brunet <jbrunet@...libre.com>
Cc:     syzbot <syzbot+f3e3434787332dfc1c47@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>, devicetree@...r.kernel.org,
        Kevin Hilman <khilman@...libre.com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        linux-amlogic@...ts.infradead.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        netdev <netdev@...r.kernel.org>, robh+dt@...nel.org,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: WARNING: bad unlock balance detected! (3)

On Mon, Mar 25, 2019 at 12:54 PM Jerome Brunet <jbrunet@...libre.com> wrote:
>
> On Sat, 2019-03-23 at 07:14 -0700, syzbot wrote:
> > syzbot has bisected this bug to:
> >
> > commit ec01fb69ac8034ad6e839b31f9df167a110f868b
> > Author: Jerome Brunet <jbrunet@...libre.com>
> > Date:   Wed Jan 16 17:59:47 2019 +0000
> >
> >      arm64: dts: meson: s400: fix emmc maximum rate
> >
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10afb7cf200000
> > start commit:   065b6c4c Merge tag 'devicetree-for-5.1' of git://git.kerne..
> > git tree:       upstream
> > final crash:    https://syzkaller.appspot.com/x/report.txt?x=12afb7cf200000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=14afb7cf200000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=ea4067c9a08ae046
> > dashboard link: https://syzkaller.appspot.com/bug?extid=f3e3434787332dfc1c47
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12a10577200000
> >
> > Reported-by: syzbot+f3e3434787332dfc1c47@...kaller.appspotmail.com
> > Fixes: ec01fb69ac80 ("arm64: dts: meson: s400: fix emmc maximum rate")
> >
> > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
> Hi David,
>
> I'm not sure I understand what the problem reported is but I don't think a DT
> patch could be the cause of a locking issue on x86.
>
> If I missed something, feel free to let me know.

Hi Jerome,

I think you are right. It seems that other unrelated kernel bugs have
diverged bisection into the wrong direction.