Hi Paul, so I've been bisecting another issue and have been seeing the warning in the attached pic. Reverting c0f4dfd4f90f1667d234d21f15153ea09a2eaa66 ("rcu: Make RCU_FAST_NO_HZ take advantage of numbered callbacks") seems to fix the issue. The warning appears as the last thing on the screen before the machine goes down after being suspended to disk. And IRQ 16 and azx_interrupt both belong to hda_intel.c Any ideas? Thanks. -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. --