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Date: Wed, 8 May 2019 14:37:44 +0200 From: Dmitry Vyukov <dvyukov@...gle.com> To: Julia Lawall <julia.lawall@...6.fr> Cc: Pavel Machek <pavel@....cz>, syzbot <syzbot+e1a4f80c370d2381e49f@...kaller.appspotmail.com>, Borislav Petkov <bp@...en8.de>, Dan Williams <dan.j.williams@...el.com>, Dave Hansen <dave.hansen@...ux.intel.com>, Dave Jiang <dave.jiang@...el.com>, Haozhong Zhang <haozhong.zhang@...el.com>, "H. Peter Anvin" <hpa@...or.com>, jacek.anaszewski@...il.com, LKML <linux-kernel@...r.kernel.org>, linux-leds@...r.kernel.org, Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...hat.com>, Paolo Bonzini <pbonzini@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Radim Krčmář <rkrcmar@...hat.com>, rpurdie@...ys.net, syzkaller-bugs <syzkaller-bugs@...glegroups.com>, Thomas Gleixner <tglx@...utronix.de>, "the arch/x86 maintainers" <x86@...nel.org> Subject: Re: WARNING in untrack_pfn 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@...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? 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.
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