(unknown charset) [PANIC] Duplicate free of item 0xc5221800 from zone 0xc1050b40(mbuf_clus

FreeBSD 7.0-CURRENT FreeBSD 7.0-CURRENT #522: Sun Jul 31 21:52:18 PDT 2005 i386

# kgdb kernel.debug /var/crash/vmcore.2
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
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This GDB was configured as "i386-marcel-freebsd".
#0  doadump () at pcpu.h:165
165	pcpu.h: No such file or directory.
	in pcpu.h
(kgdb) where
#0  doadump () at pcpu.h:165
#1  0xc050f512 in boot (howto=260) at ../../../kern/kern_shutdown.c:397
#2  0xc050f8c3 in panic (
    fmt=0xc06ac606 "Duplicate free of item %p from zone %p(%s)\n")
    at ../../../kern/kern_shutdown.c:553
#3  0xc061578d in uma_dbg_free (zone=0xc1050b40, slab=0xc5101af8, 
    item=0xc5221800) at ../../../vm/uma_dbg.c:288
#4  0xc061398d in uma_zfree_arg (zone=0xc1050b40, item=0xc5221800, udata=0x0)
    at ../../../vm/uma_core.c:2285
#5  0xc054ef94 in mb_free_ext (m=0xc5515200) at uma.h:303
#6  0xc054ee07 in m_freem (mb=0x0) at mbuf.h:427
#7  0xc0596862 in arpresolve (ifp=0xc4e4ac00, rt0=0xc4ffd420, m=0xc4e1b700, 
    dst=0xc4e7e550, desten=0xe6e05b98 "Ä[àæ8õXÀ$ÄoÀ")
    at ../../../netinet/if_ether.c:442
#8  0xc058b53b in ether_output (ifp=0xc4e4ac00, m=0xc4e1b700, dst=0xc4e7e550, 
    rt0=0x0) at ../../../net/if_ethersubr.c:173
#9  0xc05a2135 in ip_output (m=0xc4e1b700, opt=0xc5585008, ro=0xe6e05bf4, 
    flags=2, imo=0xc4bba208, inp=0x0) at ../../../netinet/ip_output.c:772
#10 0xc0452213 in pfsync_senddef (arg=0xc4bba200)
    at ../../../contrib/pf/net/if_pfsync.c:1829
#11 0xc051d49b in softclock (dummy=0x0) at ../../../kern/kern_timeout.c:295
#12 0xc04f8362 in ithread_loop (arg=0xc4ade500)
    at ../../../kern/kern_intr.c:545
#13 0xc04f7351 in fork_exit (callout=0xc04f8200 <ithread_loop>, arg=0x0, 
    frame=0x0) at ../../../kern/kern_fork.c:789
#14 0xc065a7ac in fork_trampoline () at ../../../i386/i386/exception.s:208
(kgdb) quit

Script done on Mon Aug  1 17:42:43 2005