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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Did this issue occur in a previous version of Ubuntu, or is this a new
issue?

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.14 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".


Thanks in advance.


[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.14-trusty/


** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Tags added: kernel-da-key

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https://bugs.launchpad.net/bugs/1302719

Title:
  Allocation 2GB of EfiRuntimeServiceData breaks kernel boot

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Allocation of 2GB (in EFI application) as EfiRuntimeServiceData ubuntu 14.04 beta 2 (but have been noticed in previous versions too) makes the kernel hang. No early printks could be seen.
  Most suspicious call chain is:

  efi_enter_virtual_mode() -> efi_map_region() -> __map_region() ->
  kernel_map_pages_in_pgd() -> __change_page_attr_set_clr () ->
  __change_page_attr() -> __cpa_process_fault().

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