From b5b26198a7f928a0b1366da879539ba7818485af Mon Sep 17 00:00:00 2001
From: peter <peter@FreeBSD.org>
Date: Tue, 28 Oct 2008 03:26:25 +0000
Subject: [PATCH] After a machine has been up for a bit more than 20 days with
 HZ=1000, "ticks" goes negative.  This breaks the signed comparison in
 softclock. This causes sleep() to never wake up, tcp to stop, etc etc.  This
 is bad(TM).  Use the SEQ_LT() method from tcp's sequence number comparisons.

---
 sys/kern/kern_timeout.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/kern_timeout.c b/sys/kern/kern_timeout.c
index fe05d2ca48ab..bd754b155e00 100644
--- a/sys/kern/kern_timeout.c
+++ b/sys/kern/kern_timeout.c
@@ -233,7 +233,7 @@ callout_tick(void)
 	need_softclock = 0;
 	cc = CC_SELF();
 	mtx_lock_spin_flags(&cc->cc_lock, MTX_QUIET);
-	for (; cc->cc_softticks < ticks; cc->cc_softticks++) {
+	for (; (cc->cc_softticks - ticks) < 0; cc->cc_softticks++) {
 		bucket = cc->cc_softticks & callwheelmask;
 		if (!TAILQ_EMPTY(&cc->cc_callwheel[bucket])) {
 			need_softclock = 1;