linux-kernel - Re: INFO: task hung in fb

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Message-ID: <20200107154755.GB43062@phenom.ffwll.local>
Date:   Tue, 7 Jan 2020 16:47:55 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     syzbot <syzbot+d130c4a0890561cfac5b@...kaller.appspotmail.com>
Cc:     Rex.Zhu@....com, airlied@...ux.ie, alexander.deucher@....com,
        amd-gfx@...ts.freedesktop.org, b.zolnierkie@...sung.com,
        christian.koenig@....com, daniel.vetter@...ll.ch,
        david1.zhou@....com, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        maarten.lankhorst@...ux.intel.com, sam@...nborg.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: INFO: task hung in fb_release

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@....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

:-)

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@...kaller.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