From: Dmitry Vyukov <dvyukov@google.com>
To: syzbot <syzbot+d130c4a0890561cfac5b@syzkaller.appspotmail.com>,
Rex.Zhu@amd.com, David Airlie <airlied@linux.ie>,
alexander.deucher@amd.com, amd-gfx@lists.freedesktop.org,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
christian.koenig@amd.com, david1.zhou@amd.com,
DRI <dri-devel@lists.freedesktop.org>,
Linux Fbdev development list <linux-fbdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Sam Ravnborg <sam@ravnborg.org>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Subject: Re: INFO: task hung in fb_release
Date: Tue, 7 Jan 2020 17:01:56 +0100 [thread overview]
Message-ID: <CACT4Y+arQyPjzHSFy1MkVF2jNPJbu262_FTL5ma9AnWkXosY1g@mail.gmail.com> (raw)
In-Reply-To: <20200107154755.GB43062@phenom.ffwll.local>
On Tue, Jan 7, 2020 at 4:48 PM Daniel Vetter <daniel@ffwll.ch> wrote:
>
> On Mon, Dec 23, 2019 at 02:31:01AM -0800, syzbot wrote:
> > syzbot has bisected this bug to:
> >
> > commit e3933f26b657c341055443103bad331f4537b113
> > Author: Rex Zhu <Rex.Zhu@amd.com>
> > Date: Tue Jan 16 10:35:15 2018 +0000
> >
> > drm/amd/pp: Add edit/commit/show OD clock/voltage support in sysfs
>
> Pretty sure you don't even have that driver loaded ... from the config:
>
> # CONFIG_DRM_AMDGPU is not set
>
> :-)
Yes, it seems the bug is very flaky and flakiness changes over time.
And this is combined with non-deterministic kernel build bug:
https://github.com/google/syzkaller/issues/1271#issuecomment-559093018
It builds the same kernel, but gets a different result, so it's like
"nope, this commit very much affects the kernel so could be the root
cause"...
> Cheers, Daniel
> >
> > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12b5a799e00000
> > start commit: c6017471 Merge tag 'xfs-5.5-fixes-2' of git://git.kernel.o..
> > git tree: upstream
> > final crash: https://syzkaller.appspot.com/x/report.txt?x=11b5a799e00000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=16b5a799e00000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=7f6119e2e3675a73
> > dashboard link: https://syzkaller.appspot.com/bug?extid=d130c4a0890561cfac5b
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=169b1925e00000
> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12b9623ee00000
> >
> > Reported-by: syzbot+d130c4a0890561cfac5b@syzkaller.appspotmail.com
> > Fixes: e3933f26b657 ("drm/amd/pp: Add edit/commit/show OD clock/voltage
> > support in sysfs")
> >
> > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
>
> --
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> To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/20200107154755.GB43062%40phenom.ffwll.local.
prev parent reply other threads:[~2020-01-07 16:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-23 3:45 INFO: task hung in fb_release syzbot
2019-12-23 10:31 ` syzbot
2020-01-07 15:47 ` Daniel Vetter
2020-01-07 16:01 ` Dmitry Vyukov [this message]
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