diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index c561038..20cdad4 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -78,6 +78,7 @@ static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
 
 	if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
 		pr_warning("CPU%d: family %d not supported\n", cpu, c->x86);
+		dump_stack();
 		return -1;
 	}