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diff --git a/sys/x86/x86/msi.c b/sys/x86/x86/msi.c
--- a/sys/x86/x86/msi.c
+++ b/sys/x86/x86/msi.c
@@ -219,6 +219,14 @@
struct msi_intsrc *msi = (struct msi_intsrc *)isrc;
msi = msi->msi_first;
+
+ /*
+ * Interrupt sources are always registered, but never unregistered.
+ * Handle the case where MSIs have all been unregistered.
+ */
+ if (msi == NULL)
+ return;
+
msi->msi_enabled--;
if (msi->msi_enabled == 0) {
for (u_int i = 0; i < msi->msi_count; i++)

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