panic in rtrequest1_fib

-CURRENT from 25 jan

panic: _rw_wlock_hard: recursing but non-recursive rw radix node head _at_ 
/usr/src/sys/net/route.c:831

I'll keep vmcore around for a while.

#0  doadump () at pcpu.h:246
#1  0xc082f7be in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:420
#2  0xc082fa92 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:576
#3  0xc082d986 in _rw_wlock_hard (rw=0xc577e680, tid=3312676864, file=0xc0bf0410 
"/usr/src/sys/net/route.c", line=831) at /usr/src/sys/kern/kern_rwlock.c:592
#4  0xc082e23e in _rw_wlock (rw=0xc577e680, file=0xc0bf0410 
"/usr/src/sys/net/route.c", line=831) at /usr/src/sys/kern/kern_rwlock.c:218
#5  0xc08dea95 in rtrequest1_fib (req=2, info=0xe5b22b1c, ret_nrt=0x0, fibnum=0) 
at /usr/src/sys/net/route.c:831
#6  0xc08df62e in rtrequest_fib (req=2, dst=0xc99a91c0, gateway=0xc99a91d0, 
netmask=0x0, flags=262167, ret_nrt=0x0, fibnum=0) at /usr/src/sys/net/route.c:680
#7  0xc091deeb in in_rtrequest (req=2, dst=0xc99a91c0, gateway=0xc99a91d0, 
netmask=0x0, flags=262167, ret_nrt=0x0, fibnum=0) at 
/usr/src/sys/netinet/in_rmx.c:459
#8  0xc091e42f in in_rtqkill (rn=0xc6032068, rock=0xe5b22bdc) at 
/usr/src/sys/netinet/in_rmx.c:213
#9  0xc08dc5c5 in rn_walktree (h=0xc577e600, f=0xc091e3b0 <in_rtqkill>, 
w=0xe5b22bdc) at /usr/src/sys/net/radix.c:1107
#10 0xc091e031 in in_rtqdrain () at /usr/src/sys/netinet/in_rmx.c:330
#11 0xc0921d5d in ip_drain () at /usr/src/sys/netinet/ip_input.c:1210
#12 0xc081e6f2 in mb_reclaim (junk=0x0) at /usr/src/sys/kern/kern_mbuf.c:681
#13 0xc0a6cff9 in vm_pageout () at /usr/src/sys/vm/vm_pageout.c:692
#14 0xc080c728 in fork_exit (callout=0xc0a6c950 <vm_pageout>, arg=0x0, 
frame=0xe5b22d38) at /usr/src/sys/kern/kern_fork.c:821
#15 0xc0b16c30 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:270