kern/50548: bogus refcnt 0 on lle

[mlelstv%serpens.de@localhost]

>Number:         50548
>Category:       kern
>Synopsis:       bogus refcnt 0 on lle
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Dec 14 06:50:00 +0000 2015
>Originator:     Michael van Elst
>Release:        NetBSD 7.99.24
>Organization:
-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."
>Environment:
	
	
System: NetBSD hoppa 7.99.24 NetBSD 7.99.24 (HOPPA) #129: Sun Dec 13 11:41:41 CET 2015 mlelstv@pussyfoot:/home/netbsd-current/obj.evbarm/home/netbsd-current/src/sys/arch/evbarm/compile/HOPPA evbarm
Architecture: earmv6hf
Machine: evbarm
>Description:

The system at that point had the usmsc0 interface and a urwtn0 interface
on the same IP network. urwtn0 didn't have a route so far. Adding and
deleting a local host route to urwtn0 resulted in:

panic: kernel diagnostic assertion "(lle)->lle_refcnt > 0" failed: file "/home/netbsd-current/src/sys/net/if_llatbl.c", line 305 bogus refcnt 0 on lle 0xa8e66e18

a minute earlier, the kernel already logged:

arpresolve: valid llentry has no rtentry for A.B.C.D on usmsc0

which might be related. A.B.C.D is the target of the host route.

>How-To-Repeat:

So far I cannot reproduce the panic.

>Fix:
	

>Unformatted: