mbuf panic from a kernel with a supdate=2004.06.04.02.00.00

the last couple of days  I've gotten a panic 

panic: mb_init_pack(): Can't deal with failure yet.
panic messages:
---
panic: mb_init_pack(): Can't deal with failure yet.
at line 296 in file /usr/src/sys/kern/kern_mbuf.c
cpuid = 2;
boot() called on cpu#2

syncing disks, buffers remaining... panic: mb_init_pack(): Can't deal with failure yet.
at line 296 in file /usr/src/sys/kern/kern_mbuf.ccpuid = 2;
boot() called on cpu#2

kern_mbuf.c is src/sys/kern/kern_mbuf.c,v 1.2 2004/06/01 16:17:10

back trace: 

#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:236
236             dumping++;
(kgdb) bt
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:236
#1  0xc0631b4b in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:370
#2  0xc0632326 in __panic (file=0xc0840d67 "/usr/src/sys/kern/kern_mbuf.c", line=296,
    fmt=0xc0840d3a "mb_init_pack(): Can't deal with failure yet.")
    at /usr/src/sys/kern/kern_shutdown.c:548
#3  0xc0626706 in mb_fini_pack (mem=0xc73a9500, size=256) at /usr/src/sys/kern/kern_mbuf.c:296
#4  0xc07a340b in uma_zalloc_internal (zone=0xc73a9500, udata=0x0, flags=1)
    at /usr/src/sys/vm/uma_core.c:1952
#5  0xc0528e63 in fxp_add_rfabuf (sc=0xc5666000, rxp=0xc56665b4) at /usr/src/sys/sys/mbuf.h:375
#6  0xc0527eaa in fxp_intr_body (sc=0xc5666000, ifp=0xc5666000, statack=0 '\0', count=-1)
    at /usr/src/sys/dev/fxp/if_fxp.c:1726
#7  0xc0527cbe in fxp_intr (xsc=0xc5666000) at /usr/src/sys/dev/fxp/if_fxp.c:1599
#8  0xc061c40b in ithread_loop (arg=0xc557d200) at /usr/src/sys/kern/kern_intr.c:574
#9  0xc061b114 in fork_exit (callout=0xc061c216 <ithread_loop>, arg=0x0, frame=0x0)
    at /usr/src/sys/kern/kern_fork.c:816
(kgdb)



QUAD XEON w/ 4 Gigs RAM
KERN Compiled with 

SCHED_ULE
ADAPTIVE_MUTEXES
NO DDB,INVARIANTS,WITNESS,WITNESS_SKIPSPIN

debug.mpsafenet=0


everything is linked agains libpthread.so.1 




-- 
Email: skafte_at_trollkarl.net 
--                                                                   --
When things can't get any worse, they simplify themselves by getting a
whole lot worse then complicated. A complete and utter disaster is the 
simplest thing in the world; it's preventing one that's complex. 
(Janet Morris)