From 9a8771a64bf9797acf482d4d7d4954be83a75095 Mon Sep 17 00:00:00 2001
From: tegge <tegge@FreeBSD.org>
Date: Mon, 2 Jun 2003 20:43:28 +0000
Subject: [PATCH] Initialize td->td_pcb->pcb_ext in cpu_thread_setup() since a
 garbage value (e.g. 0xd0d0d0d0) can cause a kernel panic.

---
 sys/i386/i386/vm_machdep.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/i386/i386/vm_machdep.c b/sys/i386/i386/vm_machdep.c
index 2195bdc692d2..b3c36562e4cf 100644
--- a/sys/i386/i386/vm_machdep.c
+++ b/sys/i386/i386/vm_machdep.c
@@ -309,6 +309,7 @@ cpu_thread_setup(struct thread *td)
 	td->td_pcb =
 	     (struct pcb *)(td->td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
 	td->td_frame = (struct trapframe *)((caddr_t)td->td_pcb - 16) - 1;
+	td->td_pcb->pcb_ext = NULL; 
 }
 
 /*