I'd like to nominate commit f605cfca8c39 ("perf/x86/intel: Fix large
period handling on Broadwell CPUs") for backport to the affected
stable Linux releases. (The bug was introduced in 4.1.)
Because of this bug, the NMI watchdog timer may fire spuriously on
Broadwell systems, resulting in a hard lockup panic when there is, in
fact, no lockup.
