tc qdisc add dev eth1 handle ffff: ingress
tc filter add dev eth1 protocol ip parent ffff: pref 99 basic \
   flowid 1:1 action pass random determ drop 0
                                             ^
the above cause a division by zero in the kernel on the first
packet in.

Signed-off-by: Kim Nordlund <redacted>

diff -rub linux-2.6.19-orig/net/sched/act_gact.c linux/net/sched/act_gact.c

--- linux-2.6.19-orig/net/sched/act_gact.c	2006-11-29 23:57:37.000000000 +0200
+++ linux/net/sched/act_gact.c	2006-11-30 13:22:37.000000000 +0200

@@ -111,7 +111,7 @@
 	if (tb[TCA_GACT_PROB-1] != NULL) {
 		struct tc_gact_p *p_parm = RTA_DATA(tb[TCA_GACT_PROB-1]);
 		gact->tcfg_paction = p_parm->paction;
-		gact->tcfg_pval    = p_parm->pval;
+		gact->tcfg_pval    = p_parm->pval ? : 1;