kern/149804: ICMP redirect on causes "panic: rtqkill route really not free"

[Pete French]

>Number:         149804
>Category:       kern
>Synopsis:       ICMP redirect on causes "panic: rtqkill route really not free"
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Aug 19 13:10:03 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Pete French
>Release:        FreeBSD 8.1-STABLE amd64
>Organization:
Ticket Switch Ltd
>Environment:
System: FreeBSD dilbert.rattatosk 8.1-STABLE FreeBSD 8.1-STABLE #1: Tue Aug 17 12:30:13 BST 2010 petefrench at dilbert.rattatosk:/usr/obj/usr/src/sys/GENERIC amd64


>Description:

	Running 8.1 in an environment with multiple routers that issue ICMP redirects can cause the system to panic with the message given in the subject line.

>How-To-Repeat:

	Install an 8.1 machine intp an envir0onment as above - I have not found a reliable way to reporduce it, but in our case it crashes within a few days.


>Fix:

	setting net.inet.icmp.drop_redirect=1 will prevent this. There is also a patch from Xin LI which appears to fix the problem (or at least mitigate it to the point where we havent seen it since it was applied)

>Release-Note:
>Audit-Trail:
>Unformatted: