RELENG_5 : Page fault when running quagga ospf with IPv6

System with RELENG_5 (Aug 25)

When starting /usr/local/sbin/ospf6d (from /usr/ports/net/quagga)
I instantly get a kernel page fault. Reproducable. Trace:

#0  doadump () at pcpu.h:159
[...]
#22 0x0000000c in ?? ()
#23 0x00000000 in ?? ()
#24 0xc055954e in propagate_priority (td=0xc1dcc420) at 
/usr/src/sys/kern/subr_turnstile.c:243
#25 0xc0559ded in turnstile_wait (ts=0xc1dc5500, lock=0xc076b640, owner=0x0) at 
/usr/src/sys/kern/subr_turnstile.c:556
#26 0xc0529ca7 in _mtx_lock_sleep (m=0xc076b640, td=0xc1d8e6e0, opts=0, 
file=0x0, line=0)
     at /usr/src/sys/kern/kern_mutex.c:540
#27 0xc051ac9f in ithread_loop (arg=0xc1d9e880) at 
/usr/src/sys/kern/kern_intr.c:545
#28 0xc0519afd in fork_exit (callout=0xc051ab03 <ithread_loop>, arg=0x0, 
frame=0x0)
     at /usr/src/sys/kern/kern_fork.c:820
#29 0xc06bc8ac in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:209

Frame 24:
238                         ts->ts_lockobj->lo_name));
239
240                     /*
241                      * Pick up the lock that td is blocked on.
242                      */
243                     ts = td->td_blocked;
244                     MPASS(ts != NULL);
245                     tc = TC_LOOKUP(ts->ts_lockobj);
246                     mtx_lock_spin(&tc->tc_lock);
247

ts->td_blocked is NULL ...

kgdb) print *td
$2 = {td_proc = 0xc1ddc000, td_ksegrp = 0xc1d97000, td_plist = {tqe_next = 0x0, 
tqe_prev = 0xc1ddc010}, td_kglist = {
     tqe_next = 0x0, tqe_prev = 0xc1d9701c}, td_slpq = {tqe_next = 0x0, tqe_prev 
= 0x0}, td_lockq = {tqe_next = 0x0,
     tqe_prev = 0x0}, td_runq = {tqe_next = 0x0, tqe_prev = 0x0}, td_selq = 
{tqh_first = 0x0, tqh_last = 0x0},
   td_sleepqueue = 0xc1dc7360, td_turnstile = 0xc1dc5540, td_tid = 100036, 
td_flags = 0, td_inhibitors = 16,
   td_pflags = 0, td_last_kse = 0xc1d95690, td_kse = 0xc1d95690, td_dupfd = 0, 
td_wchan = 0x0, td_wmesg = 0x0,
   td_lastcpu = 0 '\0', td_oncpu = 255 ', td_locks = 0, td_blocked = 0x0, 
td_ithd = 0xc1d8cc00, td_lockname = 0x0,
   td_contested = {lh_first = 0xc2a72400}, td_sleeplocks = 0x0, 
td_intr_nesting_level = 0, td_pinned = 0,
   td_mailbox = 0x0, td_ucred = 0xc1d7c200, td_standin = 0x0, td_prticks = 0, 
td_upcall = 0x0, td_sticks = 0,
   td_uuticks = 0, td_usticks = 0, td_intrval = 0, td_oldsigmask = {__bits = {0, 
0, 0, 0}}, td_sigmask = {__bits = {0,
       0, 0, 0}}, td_siglist = {__bits = {0, 0, 0, 0}}, td_waitset = 0x0, 
td_umtx = {tqe_next = 0x0, tqe_prev = 0x0},
   td_generation = 7664, td_sigstk = {ss_sp = 0x0, ss_size = 0, ss_flags = 0}, 
td_kflags = 0, td_xsig = 0,
   td_profil_addr = 0, td_profil_ticks = 0, td_base_pri = 40 '(', td_priority = 
24 '\030', td_pcb = 0xd55c7da0,
   td_state = TDS_INHIBITED, td_retval = {0, 0}, td_slpcallout = {c_links = {sle 
= {sle_next = 0x0}, tqe = {
         tqe_next = 0x0, tqe_prev = 0x0}}, c_time = 0, c_arg = 0x0, c_func = 0, 
c_flags = 8}, td_frame = 0xd55c7d48,
   td_kstack_obj = 0xc143e210, td_kstack = 3579600896, td_kstack_pages = 2, 
td_altkstack_obj = 0x0, td_altkstack = 0,
   td_altkstack_pages = 0, td_critnest = 1, td_md = {md_savecrit = 582}, 
td_sched = 0xc1dcc57c}

Any ideas ?

-Patrick