[Bug 215241] New: "usbreset" tool causes hung task on kernel 5.15.3+ with Hauppauge WinTV dualHD

[Bug 215241] New: "usbreset" tool causes hung task on kernel 5.15.3+ with Hauppauge WinTV dualHD

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215241

            Bug ID: 215241
           Summary: "usbreset" tool causes hung task on kernel 5.15.3+
                    with Hauppauge WinTV dualHD
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.15.3
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: mabo@elbmurf.de
        Regression: No

Created attachment 299917
  --> https://bugzilla.kernel.org/attachment.cgi?id=299917&action=edit
Dmesg log

Hello, I have a Hauppauge WinTV dualHD DVB-T2 USB card and need to use the
nifty tool usbreset to reset its connection after each standby because else it
won’t work. Recently, starting with Linux 5.15.3, usbreset started causing
severe hangs even to the point of my system being unable to do a proper reboot
or shutdown. Same with 5.16.0-rc3. I’m now back on 5.13.2 without this problem.
In the attachment you can read a dmesg log. Distro is Arch Linux.

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[Bug 215241] "usbreset" tool causes hung task on kernel 5.15.3+ with Hauppauge WinTV dualHD

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215241

--- Comment #1 from Alan Stern (stern@rowland.harvard.edu) ---
You can try using "git bisect" to find the commit which caused this bad
behavior.

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[Bug 215241] "usbreset" tool causes hung task on kernel 5.15.3+ with Hauppauge WinTV dualHD

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215241

--- Comment #2 from Maximilian Böhm (mabo@elbmurf.de) ---
I’m trying, but "git tag" is only showing me versions from 2.6.11 to 5.9.9.

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[Bug 215241] "usbreset" tool causes hung task on kernel 5.15.3+ with Hauppauge WinTV dualHD

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215241

--- Comment #3 from Maximilian Böhm (mabo@elbmurf.de) ---
Ah, it’s counting "v5.1.9, v5.10", what a mess. OK, I’m on it.

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[Bug 215241] "usbreset" tool causes hung task on kernel 5.15.3+ with Hauppauge WinTV dualHD

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215241

--- Comment #4 from Maximilian Böhm (mabo@elbmurf.de) ---
Hallo again, found the commit:

$ git bisect bad
2899243f272f8801dceb1bb692bd1a3ae3f281c2 is the first bad commit
commit 2899243f272f8801dceb1bb692bd1a3ae3f281c2
Author: Pavel Skripkin <paskripkin@gmail.com>
Date:   Thu Jul 29 22:23:33 2021 +0200

    media: em28xx: add missing em28xx_close_extension

    [ Upstream commit 2c98b8a3458df03abdc6945bbef67ef91d181938 ]

    If em28xx dev has ->dev_next pointer, we need to delete ->dev_next list
    node from em28xx_extension_devlist on disconnect to avoid UAF bugs and
    corrupted list bugs, since driver frees this pointer on disconnect.

    Reported-and-tested-by:
syzbot+a6969ef522a36d3344c9@syzkaller.appspotmail.com

    Fixes: 1a23f81b7dc3 ("V4L/DVB (9979): em28xx: move usb probe code to a
proper place")
    Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
    Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
    Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>

 drivers/media/usb/em28xx/em28xx-cards.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)


What next?

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[Bug 215241] "usbreset" tool causes hung task on kernel 5.15.3+ with Hauppauge WinTV dualHD

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215241

--- Comment #5 from Alan Stern (stern@rowland.harvard.edu) ---
You should write to Paul Skripkin, telling him about this problem.  And CC: all
the people listed on the Signed-off-by: lines, as well as the
linux-media@vger.kernel.org list.

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