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

Pete French petefrench at
Thu Aug 19 13:10:04 UTC 2010

>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
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Aug 19 13:10:03 UTC 2010
>Originator:     Pete French
>Release:        FreeBSD 8.1-STABLE amd64
Ticket Switch Ltd
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


	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.


	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.


	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)


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