On Tue, 15 Jun 2021 14:35:27 +0200 Rasmus Villemoes <rasmus.villemoes@xxxxxxxxx> wrote: > Reverting commit 3d5bfbd9716318b1ca5c38488aa69f64d38a9aa5 (gpio: > mpc8xxx: change the gpio interrupt flags.) makes it go away, as does > disabling CONFIG_PREEMPT_RT or simply booting a vanilla v5.10.42 (where > that option exists but cannot be selected). I'm curious if it will also trigger on vanilla v5.10.42 but add to the kernel command line: threadirqs Make sure you have CONFIG_IRQ_FORCED_THREADING set too. Because it appears to be an issue with that being called by the generic threaded irq infrastructure, which PREEMPT_RT enables automatically. -- Steve