This bug was fixed in the package linux - 5.15.0-17.17

---------------
linux (5.15.0-17.17) jammy; urgency=medium

  * jammy/linux: 5.15.0-17.17 -proposed tracker (LP: #1957809)

 -- Andrea Righi <[email protected]>  Thu, 13 Jan 2022 17:11:21
+0100

** Changed in: linux (Ubuntu Jammy)
       Status: Expired => Fix Released

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https://bugs.launchpad.net/bugs/1948038

Title:
  disable CONFIG_KFENCE_STATIC_KEYS in linux 5.15

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Jammy:
  Fix Released

Bug description:
  [Impact]

  KFENCE devs are changing CONFIG_KFENCE_STATIC_KEYS to be disabled by
  default, because it's introducing more problems than benefits:

  https://lore.kernel.org/all/[email protected]/T/#u

  This also seems to trigger QEMU bugs during the systemd autopkgtest, like:
  https://bugs.launchpad.net/qemu/+bug/1920934

  [Test case]

  Run systemd autopkgtest.

  [Fix]

  Disable CONFIG_KFENCE_STATIC_KEYS.

  [Regression potential]

  We may experience an overall performance regression for not using
  static branches in the KFENCE code.

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