v4l2-relayd freezes system until it is kicked by OOM

[Kjeld Flarup]

This may be a very complex scenario with several components involved. But it ends up in v4l2-relayd having allocated 6GB RSS memory, and suspect this memory increase to be the problem, or is it just a side effect?

I have seen this error a few times now, and it involves bluetooth, Microsoft Teams and possibly also Chrome.

It occurs when I start a Teams meeting, but my bluetooth headset is not connected (possibly a bluetooth bug also). I then do something to activate bluetooth, and then my computer freezes, for half a minute (feels very long). When it becomes alive again, then I can see the OOM in the attached syslog snippet - and Chrome is also killed!

System information:

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.1 LTS
Release: 22.04
Codename: jammy

$ uname -a
Linux kfa-Latitude-5521 5.17.0-1018-oem #19-Ubuntu SMP PREEMPT Wed Sep 21 09:54:58 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

Some package versions
ii libv4l2rds0:amd64 1.22.1-2build1 amd64 Video4Linux Radio Data System (RDS) decoding library
ii v4l2-relayd 0.1.2-0ubuntu1 amd64 Streaming relay for v4l2loopback using GStreamer
ii google-chrome-stable 108.0.5359.71-1 amd64 The web browser from Google
ii teams 1.5.00.23861 amd64 Microsoft Teams for Linux is your chat-centered workspace in Office 365.
ii bluez 5.64-0ubuntu1 amd64 Bluetooth tools and daemons
ii bluez-cups 5.64-0ubuntu1 amd64 Bluetooth printer driver for CUPS
ii bluez-obexd 5.64-0ubuntu1 amd64 bluez obex daemon
ii gir1.2-gnomebluetooth-3.0:amd64 42.0-5 amd64 Introspection data for GnomeBluetooth
ii gnome-bluetooth 3.34.5-8 amd64 GNOME Bluetooth Send To app
ii gnome-bluetooth-3-common 42.0-5 all GNOME Bluetooth 3 common files
ii gnome-bluetooth-common 3.34.5-8 all GNOME Bluetooth common files
ii libbluetooth3:amd64 5.64-0ubuntu1 amd64 Library to use the BlueZ Linux Bluetooth stack
ii libgnome-bluetooth-3.0-13:amd64 42.0-5 amd64 GNOME Bluetooth 3 support library
ii libgnome-bluetooth13:amd64 3.34.5-8 amd64 GNOME Bluetooth tools - support library
ii libkf5bluezqt-data 5.92.0-0ubuntu1 all data files for bluez-qt
ii libkf5bluezqt6:amd64 5.92.0-0ubuntu1 amd64 Qt wrapper for bluez
ii libldacbt-enc2:amd64 2.0.2.3+git20200429+ed310a0-4 amd64 LDAC Bluetooth encoder library (shared library)
ii pulseaudio-module-bluetooth 1:15.99.1+dfsg1-1ubuntu2 amd64 Bluetooth module for PulseAudio sound server
ii qml-module-org-kde-bluezqt:amd64 5.92.0-0ubuntu1 amd64 QML wrapper for bluez

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.