I don't see that the patch landed in mainline as of yet:
x86/xen: safely map and unmap grant frames when in atomic context
As soon as it does, I can build a trusty test kernel with a cherry pick
of that commit and we can confirm it fixes this bug.
** Changed in: linux (Ubuntu Trusty)
Status: In Progress => Triaged
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
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https://bugs.launchpad.net/bugs/1350373
Title:
Kernel BUG in paravirt_enter_lazy_mmu when running as a Xen PV guest
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