linux-kernel - Re: WARNING in untrack

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Message-ID: <20190813113154.GA8420@amd>
Date:   Tue, 13 Aug 2019 13:31:54 +0200
From:   Pavel Machek <pavel@....cz>
To:     syzbot <syzbot+e1a4f80c370d2381e49f@...kaller.appspotmail.com>
Cc:     Julia.Lawall@...6.fr, bp@...en8.de, dan.j.williams@...el.com,
        dave.hansen@...ux.intel.com, dave.jiang@...el.com,
        dvyukov@...gle.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 Tue 2019-08-13 03:56:06, syzbot wrote:
> syzbot has found a reproducer for the following crash on:

Unsigned emails are ugly. Could the "From: " be modified to include
name of responsible person?

> HEAD commit:    d45331b0 Linux 5.3-rc4
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=16130d4a600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3d7eaed8496da4da
> dashboard link: https://syzkaller.appspot.com/bug?extid=e1a4f80c370d2381e49f
> compiler:       clang version 9.0.0 (/home/glider/llvm/clang
> 80fee25776c2fb61e74c1ecb1a523375c2500b69)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=131f8e0e600000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10e1a1ee600000
> 
> The bug was bisected 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

And this looks like mistake. I don't think this commit is causing the
crash. Can you somehow verify?

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

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