focal/linux-uc20-efi: 5.4.0-105.119.1 snap-debs snap:pc-kernel

[Kleber Sacilotto de Souza]

This bug will contain status and test results related to a kernel source (or snap) as stated in the title.

For an explanation of the tasks and the associated workflow see:
  https://wiki.ubuntu.com/Kernel/kernel-sru-workflow

-- swm properties --
issue: KSRU-1294
kernel-stable-master-bug: 1964206
phase: Certification Testing
phase-changed: Sunday, 20. March 2022 23:16 UTC
reason:
  snap-certification-testing: Stalled -s testing FAILED
snap-name: pc-kernel
variant: snap-debs
versions-clamp:
  parent: 5.4.0-105.119.1
  self: 5.4.0-105.119.1

[Paul Larson (pwlars)]

I'm currently seeing a regression with this kernel on dawson FDE nuc on the clocktest test in checkbox. This is a test that checks for cpu clock jitter, and I retried it multiple times and it is very reproducible. I also reverted to the kernel in stable and failed to reproduce it there. You can find the code for this test at https://git.launchpad.net/plainbox-provider-checkbox/tree/src/clocktest.c or you can also install the checkbox snap (uc18/stable) and run "checkbox.checkbox-cli run '.*clocktest.*'" to run it from the snap.

This looks to be the same thing we reported seeing in the 4.15 kernel in https://bugs.launchpad.net/kernel-sru-workflow/+bug/1964213 and seems to come about because of the constant stream of messages like this:
[ 1634.056656] Bluetooth: hci0: Malicious advertising data. Stopping processing
[ 1634.141571] Bluetooth: hci0: Malicious advertising data. Stopping processing
[ 1634.226498] Bluetooth: hci0: Malicious advertising data. Stopping processing
[ 1634.311406] Bluetooth: hci0: Malicious advertising data. Stopping processing
[ 1634.396312] Bluetooth: hci0: Malicious advertising data. Stopping processing
[ 1634.481252] Bluetooth: hci0: Malicious advertising data. Stopping processing
[ 1634.566168] Bluetooth: hci0: Malicious advertising data. Stopping processing
[ 1634.651073] Bluetooth: hci0: Malicious advertising data. Stopping processing
[ 1634.735994] Bluetooth: hci0: Malicious advertising data. Stopping processing
[ 1634.820859] Bluetooth: hci0: Malicious advertising data. Stopping processing

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

The bug was tagged as certification-testing-failed