Linux perf/x86/amd/core - overflow status not cleared for unhandled indices: Unhandled overflow bits are left set

Impact

Unhandled overflow bits are left set in the PMU status register, so stale overflow state persists and subsequent interrupts are misattributed. The visible effect is corrupted performance data and spurious NMIs - which on a GPU cluster means your capacity and efficiency measurements are quietly wrong.

Who can reach it

Local, through perf counter overflow handling.

What to do

Distro kernel update plus reboot.

References