Comment 7 for bug 1896725

Just some additional data without any final conclusion. Talking to Sean, the affected instance type seem to be all Xen based. The provided stacktrace backs this. In the past that could have been a mix of paravirtualized (PV) and hardware virtualized (HVM). But since spectre/meltdown I expect that to be all HVM guests.

From the stacktrace the bug occurs early during setup of ACPI. At least that part has not changed on the 4.4 kernel side. There is one change in this cycle which changes where internal driver data gets attached to interrupt controller structures. Though that would be a change which was applied to all (4.4, 4.15, 5.4) kernels in this cycle.