Pi 400 freeze

[No]

My Raspberry Pi 400 became extremely slow, and a few minutes later freezed.
By the way, it didn't happen on the current session, but on May 3rd, the system was pretty the same.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: linux-image-generic (not installed)
ProcVersionSignature: Ubuntu 5.11.0-1007.7-raspi 5.11.12
Uname: Linux 5.11.0-1007-raspi aarch64
ApportVersion: 2.20.11-0ubuntu65
Architecture: arm64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: norb 1423 F.... pulseaudio
 /dev/snd/controlC1: norb 1423 F.... pulseaudio
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Tue May 11 17:36:34 2021
ImageMediaBuild: 20210421
Lspci-vt: -[0000:00]---00.0-[01]----00.0 VIA Technologies, Inc. VL805 USB 3.0 Host Controller
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcFB: 0 vc4drmfb
ProcKernelCmdLine: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 video=HDMI-A-1:1920x1080M@60 smsc95xx.macaddr=E4:5F:01:08:E0:A1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 dwc_otg.lpm_enable=0 console=tty1 root=LABEL=writable rootfstype=ext4 elevator=deadline rootwait fixrtc quiet splash
RelatedPackageVersions:
 linux-restricted-modules-5.11.0-1007-raspi N/A
 linux-backports-modules-5.11.0-1007-raspi N/A
 linux-firmware 1.197
SourcePackage: linux
StagingDrivers: vc_sm_cma bcm2835_isp bcm2835_mmal_vchiq bcm2835_v4l2 bcm2835_codec snd_bcm2835
UpgradeStatus: No upgrade log present (probably fresh install)
acpidump:

[Alex Murray (alexmurray)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. We appreciate the difficulties you are facing, but this appears to be a "regular" (non-security) bug. I have unmarked it as a security issue since this bug does not show evidence of allowing attackers to cross privilege boundaries nor directly cause loss of data/privacy. Please feel free to report any other bugs you may find.

[Alex Murray (alexmurray)]

Thank you for using Ubuntu and taking the time to report a bug. Your report should contain, at a minimum, the following information so we can better find the source of the bug and work to resolve it.

Submitting the bug about the proper source package is essential. For help see https://wiki.ubuntu.com/Bugs/FindRightPackage . Additionally, in the report please include:

1) The release of Ubuntu you are using, via 'cat /etc/lsb-release' or System -> About Ubuntu.
2) The version of the package you are using, via 'dpkg -l PKGNAME | cat' or by checking in Synaptic.
3) What happened and what you expected to happen.

The Ubuntu community has also created debugging procedures for a wide variety of packages at https://wiki.ubuntu.com/DebuggingProcedures . Following the debugging instructions for the affected package will make your bug report much more complete. Thanks!