On Tue, 15 Jun 2021 14:35:27 +0200
Rasmus Villemoes [off-list ref] 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