D55284.diff
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	diff --git a/sys/kern/subr_intr.c b/sys/kern/subr_intr.c
	--- a/sys/kern/subr_intr.c
	+++ b/sys/kern/subr_intr.c
	@@ -1291,10 +1291,22 @@
	irq_assign_cpu = true;
	for (i = 0; i < intr_nirq; i++) {
	isrc = irq_sources[i];
	- if (isrc == NULL \|\| isrc->isrc_handlers == 0 \|\|
	+ if (isrc == NULL \|\|
	isrc->isrc_flags & (INTR_ISRCF_PPI \| INTR_ISRCF_IPI))
	continue;

	+ /*
	+ * We can reach this point with isrc_handlers == 0 if a
	+ * driver allocates interrupts but does not set them up
	+ * immediately; for example, a network driver might
	+ * postpone calling bus_setup_intr on I/O IRQ(s) until
	+ * the interface is brought up.
	+ */
	+ if (isrc->isrc_handlers == 0) {
	+ CPU_ZERO(&isrc->isrc_cpu);
	+ continue;
	+ }
	+
	if (isrc->isrc_event != NULL &&
	isrc->isrc_flags & INTR_ISRCF_BOUND &&
	isrc->isrc_event->ie_cpu != CPU_FFS(&isrc->isrc_cpu) - 1)