Index: sys/x86/x86/msi.c
===================================================================
--- sys/x86/x86/msi.c
+++ sys/x86/x86/msi.c
@@ -246,7 +246,7 @@
 	struct msi_intsrc *sib, *msi = (struct msi_intsrc *)isrc;
 	int old_vector;
 	u_int old_id;
-	int i, vector;
+	int error, i, vector;
 
 	/*
 	 * Only allow CPUs to be assigned to the first message for an
@@ -305,8 +305,11 @@
 		    "msi: Assigning MSI IRQ %d to local APIC %u vector %u\n",
 			    sib->msi_irq, sib->msi_cpu, sib->msi_vector);
 	}
-	BUS_REMAP_INTR(device_get_parent(msi->msi_dev), msi->msi_dev,
+	error = BUS_REMAP_INTR(device_get_parent(msi->msi_dev), msi->msi_dev,
 	    msi->msi_irq);
+	if (error != 0)
+		printf("%s: error %d from BUS_REMAP_INTR for irq %u\n",
+		    __func__, error, msi->msi_irq);
 
 	/*
 	 * Free the old vector after the new one is established.  This is done