From: Dmitry Vyukov <dvyukov@google.com>
To: Julia Lawall <julia.lawall@lip6.fr>
Cc: "Pavel Machek" <pavel@ucw.cz>,
syzbot <syzbot+e1a4f80c370d2381e49f@syzkaller.appspotmail.com>,
"Borislav Petkov" <bp@alien8.de>,
"Dan Williams" <dan.j.williams@intel.com>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Dave Jiang" <dave.jiang@intel.com>,
"Haozhong Zhang" <haozhong.zhang@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
jacek.anaszewski@gmail.com, LKML <linux-kernel@vger.kernel.org>,
linux-leds@vger.kernel.org, "Andy Lutomirski" <luto@kernel.org>,
"Ingo Molnar" <mingo@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Radim Krčmář" <rkrcmar@redhat.com>,
rpurdie@rpsys.net,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"the arch/x86 maintainers" <x86@kernel.or>
Subject: Re: WARNING in untrack_pfn
Date: Wed, 8 May 2019 14:37:44 +0200 [thread overview]
Message-ID: <CACT4Y+bcdEg_M5RNVKQvYPVLs1skvatGW-yTht7yDexR=Hjnyw@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1904121520350.22857@hadrien>
From: Julia Lawall
Date: Fri, Apr 12, 2019 at 3:21 PM
> 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@lip6.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@syzkaller.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?
Looking at the bisection log, this looks like a hard to reproduce,
flaky crash. Most likely the crash did not fire on one of the commits
and that diverted bisection in the wrong direction.
next prev parent reply other threads:[~2019-05-08 12:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <000000000000f70a0e0571ad8ffb@google.com>
2019-04-12 11:42 ` WARNING in untrack_pfn syzbot
2019-04-12 13:01 ` Pavel Machek
2019-04-12 13:21 ` Julia Lawall
2019-05-08 12:37 ` Dmitry Vyukov [this message]
2019-08-13 10:56 ` syzbot
2019-08-13 11:31 ` Pavel Machek
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