Subject: kern/4827: Kernel panic on simple route adds.
To: None <>
From: Joel Lindholm <>
List: netbsd-bugs
Date: 01/15/1998 15:03:43
>Number:         4827
>Category:       kern
>Synopsis:       Kernel panic on simple route adds
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people (Kernel Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jan 15 06:20:01 1998
>Originator:     Joel Lindholm
	Efficient Networking AB (EffNet AB)
>Release:        1.3_alpha
System: NetBSD effie 1.3_ALPHA NetBSD 1.3_ALPHA (EFFIE) #4: Sat Nov 22 21:36:43 CET 1997 ragge@effie:/usr/src/sys/arch/i386/compile/EFFIE i386

	If you manually add a host with a specified gateway, where the host
	is located on the same subnet as the gateway, the icmp redirect
	reply from the gateway will cause a kernel panic in rtredirect
	since the rt_gateway in the rtentry is the same as the rtentry,
	and thus will be deleted/freed twice.
	/* host is on the same subnet as the gateway */
	route add host gateway
	ping the host (will cause a ICMP redirect from the gateway)
	(The kernel will complain about not being able to allocate llinfo.)
	route delete host
	Either return EINVAL when the host/gateway is equal in rtredirect,
	or correctly build a new routing entry which is not a gateway.
	Which one is correct?