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Index: head/sys/arm64/arm64/mp_machdep.c
===================================================================
--- head/sys/arm64/arm64/mp_machdep.c
+++ head/sys/arm64/arm64/mp_machdep.c
@@ -304,6 +304,13 @@
{
KASSERT(intr_irq_root_dev != NULL, ("%s: no root attached", __func__));
+
+ /*
+ * Ensure that this CPU's stores will be visible to IPI
+ * recipients before starting to send the interrupts.
+ */
+ dsb(ishst);
+
PIC_IPI_SEND(intr_irq_root_dev, arg, cpus, ipi);
}

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