linux-kernel - Re: WARNING in untrack

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Date:   Fri, 12 Apr 2019 15:21:42 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Pavel Machek <pavel@....cz>
cc:     syzbot <syzbot+e1a4f80c370d2381e49f@...kaller.appspotmail.com>,
        Julia.Lawall@...6.fr, bp@...en8.de, dan.j.williams@...el.com,
        dave.hansen@...ux.intel.com, dave.jiang@...el.com,
        haozhong.zhang@...el.com, hpa@...or.com,
        jacek.anaszewski@...il.com, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org, luto@...nel.org, mingo@...hat.com,
        pbonzini@...hat.com, peterz@...radead.org, rkrcmar@...hat.com,
        rpurdie@...ys.net, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, x86@...nel.org
Subject: Re: WARNING in untrack_pfn



On Fri, 12 Apr 2019, Pavel Machek wrote:

> On Fri 2019-04-12 04:42:01, syzbot wrote:
> > syzbot has bisected this bug to:
> >
> > commit c68729119f4d2993bec3c9cb999ad76de5aeddba
> > Author: Julia Lawall <Julia.Lawall@...6.fr>
> > Date:   Sat Jul 15 09:58:19 2017 +0000
> >
> >     leds: tlc591xx: add missing of_node_put
> >
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12cda0f3200000
> > start commit:   23203e3f Merge branch 'akpm' (patches from Andrew)
> > git tree:       upstream
> > final crash:    https://syzkaller.appspot.com/x/report.txt?x=11cda0f3200000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=16cda0f3200000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=861a3573f4e78ba1
> > dashboard link: https://syzkaller.appspot.com/bug?extid=e1a4f80c370d2381e49f
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17836d15400000
> >
> > Reported-by: syzbot+e1a4f80c370d2381e49f@...kaller.appspotmail.com
> > Fixes: c68729119f4d ("leds: tlc591xx: add missing of_node_put")
> >
> > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
> Can you revert c68729119f4d2993bec3c9cb999ad76de5aeddba on master and
> see  if it fixes the problem? Because this is hard to believe...

Likewise, it seems hard to believe that the change is a problem.  But
could the problem be elsewhere and triggered by this code?

julia

>
> 									Pavel
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
>