kern/138666: [multicast] [panic] not working multicast through igmpproxy

[Bruce Simpson]

The following reply was made to PR kern/138666; it has been noted by GNATS.

From: Bruce Simpson <bms at incunabulum.net>
To: freebsd-gnats-submit at FreeBSD.org
Cc: freebsd-net at FreeBSD.org
Subject: Re: kern/138666: [multicast] [panic] not working multicast through
 igmpproxy
Date: Sun, 13 Sep 2009 02:04:52 +0100

 I did a quick pass over ip_mroute.c to see if I could have introduced 
 any obvious errors during refactoring; didn't see anything obvious.
 
 The backtrace which was posted points towards a trashed rte->m pointer, 
 assuming it's accurate and the arguments didn't get trashed on-stack. 
 The MFC lock should be held in expire_mfc(). I'll add a lock assertion 
 there for now. The VIF lock shouldn't be needed in this path.