Nucleus

diff --git a/kernel/panic.c b/kernel/panic.c
index 2c07d24..68b68b5 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -5,6 +5,8 @@
  * be compiled in.
  */
 
+#include <string.h>
+#include <nucleus/cpu.h>
 #include <nucleus/kernel.h>
 #include <io.h>
 
@@ -12,6 +14,15 @@
 _Noreturn void
 panic(char *fmt, ...)
 {
+	if (!fmt)
+		goto halt;
+	Processor *proc;
+	for_each_cpu(proc) {
+		if (proc == cpu->self)
+			continue;
+		send_ipiq(proc->id, (ipiq_func_t) panic, NULL, IPIQ_ASYNC);
+	}
+
 	outb(0xE9, '\033');
 	outb(0xE9, '[');
 	outb(0xE9, '3');
@@ -19,6 +30,13 @@ panic(char *fmt, ...)
 	outb(0xE9, 'm');
 
 	char buf[1024], *p = buf;
+	memset(buf, 0, 1024);
+
+	sprintf(buf, "[CPU#%d] ", cpu->id);
+	while (*p)
+		outb(0xE9, *p++);
+	memset(buf, 0, 1024);
+	p = buf;
 
 	/* Print error to serial port */
 	va_list args;
@@ -29,6 +47,7 @@ panic(char *fmt, ...)
 		outb(0xE9, *p++);
 	outb(0xE9, '\n');
 
+halt:
 	/* Halt processor */
 	while (1) asm volatile("cli; hlt");
 	__builtin_unreachable();