This bug is awaiting verification that the linux-mtk/5.15.0-1030.34
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-jammy-linux-mtk' to 'verification-done-jammy-
linux-mtk'. If the problem still exists, change the tag 'verification-
needed-jammy-linux-mtk' to 'verification-failed-jammy-linux-mtk'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-jammy-linux-mtk-v2 
verification-needed-jammy-linux-mtk

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https://bugs.launchpad.net/bugs/2023311

Title:
  Resolve synchronous exception on arm64

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

Bug description:
  SRU Justification

  [Impact]

  MSFT has requested the inclusion of commit
  e8dfdf3162eb549d064b8c10b1564f7e8ee82591 ('arm64: efi: Recover from
  synchronous exceptions occurring in firmware'). It looks generic
  enough to apply to the master kernel.

  Unlike x86, which has machinery to deal with page faults that occur
  during the execution of EFI runtime services, arm64 has nothing like
  that, and a synchronous exception raised by firmware code brings down
  the whole system.

  [Test Plan]

  This looks like a hard one to reproduce. Boot and regression testing
  should be sufficient.

  [Regression Potential]

  Firmware exceptions could still take down the system.

  [Other Info]

  SF: #00362062

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