linux-kernel - Re: [syzbot] [usb?] [media?] possible deadlock in vb2_video_unregister

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Date: Mon, 19 Feb 2024 05:10:03 -0800
From: syzbot <syzbot+3b1d4b3d5f7a358bf9a9@...kaller.appspotmail.com>
To: benjamin.gaignard@...labora.com, hdanton@...a.com, 
	hverkuil-cisco@...all.nl, hverkuil@...all.nl, 
	laurent.pinchart@...asonboard.com, linux-kernel@...r.kernel.org, 
	linux-media@...r.kernel.org, linux-usb@...r.kernel.org, 
	m.szyprowski@...sung.com, mchehab@...nel.org, syzkaller-bugs@...glegroups.com, 
	tfiga@...omium.org
Subject: Re: [syzbot] [usb?] [media?] possible deadlock in vb2_video_unregister_device

syzbot has bisected this issue to:

commit c838530d230bc638d79b78737fc4488ffc28c1ee
Author: Benjamin Gaignard <benjamin.gaignard@...labora.com>
Date:   Thu Nov 9 16:34:59 2023 +0000

    media: media videobuf2: Be more flexible on the number of queue stored buffers

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=166dc872180000
start commit:   b401b621758e Linux 6.8-rc5
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=156dc872180000
console output: https://syzkaller.appspot.com/x/log.txt?x=116dc872180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=eff9f3183d0a20dd
dashboard link: https://syzkaller.appspot.com/bug?extid=3b1d4b3d5f7a358bf9a9
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13ffaae8180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13ef909c180000

Reported-by: syzbot+3b1d4b3d5f7a358bf9a9@...kaller.appspotmail.com
Fixes: c838530d230b ("media: media videobuf2: Be more flexible on the number of queue stored buffers")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection