Panic on use of "deleted" route.

[Gleb Smirnoff]

  Ian,

On Mon, Aug 27, 2012 at 09:08:31PM +0200, Ian FREISLICH wrote:
I> I get a panic shortly after ppp(8) exits.  I haven't been able to
I> get a crashdump from a recent -CURRENT system, so in that absence,
I> I'll include output from an older system.  Interestingly, the route
I> partially persists past the destruction of the interface.  And the
I> panic is triggered apparently by the use of the route.  I've also
I> been unable to delete routes added on the system.  We're running a
I> kernel compiled with options RADIX_MPATH.

Please confirm that this is specific to RADIX_MPATH. I mean that
it can't reproduces w/o RADIX_MPATH.

I> [root at pbx ~]# pppctl -p pass 3000 quit all
I> Connection closed
I> [root at pbx ~]# ifconfig tun0
I> ifconfig: interface tun0 does not exist
I> [root at pbx ~]# netstat -rn
I> Routing tables
I> 
I> Internet:
I> Destination        Gateway            Flags    Refs      Use  Netif Expire
I> default            tun0               US          0        4       

A full reproduce recipe, including ppp configuration would be useful, too.
So that anyone can reproduce the panic on a test box.

-- 
Totus tuus, Glebius.