Comment 44 for bug 2024479

This bug has been fixed in Jammy, but not yet marked Fix Released apparently due to an issue with the Launchpad bot (reported to the Launchpad team); leaving as Fix Committed so to trigger when the bot runs again for it.

linux (5.15.0-83.92) jammy; urgency=medium

  * kdump fails on big arm64 systems when offset is not specified (LP: #2024479)
    - arm64: mm: use IS_ENABLED(CONFIG_KEXEC_CORE) instead of #ifdef
    - arm64: kdump: Reimplement crashkernel=X
    - docs: kdump: Update the crashkernel description for arm64
    - arm64: kdump: Do not allocate crash low memory if not needed
    - arm64/mm: Define defer_reserve_crashkernel()
    - arm64: kdump: Provide default size when crashkernel=Y, low is not specified
    - arm64: kdump: Support crashkernel=X fall back to reserve region above DMA
      zones

That is also reflected in linux-hwe, see comment #37:
> This bug was fixed in the package linux-hwe-5.15 - 5.15.0-83.92~20.04.1