Another panic (during netisr?)

Hello, hope you're having a nice day,

This is on FreeBSD 8.0-BETA3 (Ameagari) #23 r196460: Mon Aug 24 00:36:33 
JST 2009; not sure if it has been witnessed or fixed. I've been running 
it without restarts to test the stability and here we go:

Unread portion of the kernel message buffer:
panic: tcp_input: so == NULL
cpuid = 0
Uptime: 39d15h40m53s

(kgdb) #0  doadump () at pcpu.h:223
#1  0xffffffff805ab6d3 in boot (howto=260)
     at /usr/src/sys/kern/kern_shutdown.c:416
#2  0xffffffff805abb2c in panic (fmt=Variable "fmt" is not available.
)
     at /usr/src/sys/kern/kern_shutdown.c:579
#3  0xffffffff80725543 in tcp_input (m=0xffffff00672a8300, off0=Variable 
"off0" is not available.
)
     at /usr/src/sys/netinet/tcp_input.c:737
#4  0xffffffff806bea9c in ip_input (m=0xffffff00672a8300)
     at /usr/src/sys/netinet/ip_input.c:775
#5  0xffffffff8065d478 in netisr_dispatch_src (proto=1, source=Variable 
"source" is not available.
)
     at /usr/src/sys/net/netisr.c:917
#6  0xffffffff80655b7d in ether_demux (ifp=0xffffff0001656000,
     m=0xffffff00672a8300) at /usr/src/sys/net/if_ethersubr.c:895
#7  0xffffffff80655fa5 in ether_input (ifp=0xffffff0001656000,
     m=0xffffff00672a8300) at /usr/src/sys/net/if_ethersubr.c:754
#8  0xffffffff80347f64 in em_rxeof (adapter=0xffffff80002b0000, count=4)
     at /usr/src/sys/dev/e1000/if_em.c:4605
#9  0xffffffff80349d05 in em_poll (ifp=0xffffff0001656000, cmd=Variable 
"cmd" is not available.
)
     at /usr/src/sys/dev/e1000/if_em.c:1657
#10 0xffffffff8059fa17 in netisr_poll () at 
/usr/src/sys/kern/kern_poll.c:448
#11 0xffffffff8065cd56 in swi_net (arg=0xffffffff80eb7800)
     at /usr/src/sys/net/netisr.c:748
#12 0xffffffff80585398 in intr_event_execute_handlers (p=Variable "p" is 
not available.
)
     at /usr/src/sys/kern/kern_intr.c:1165
#13 0xffffffff80585ff2 in ithread_loop (arg=0xffffff00014d8660)
     at /usr/src/sys/kern/kern_intr.c:1178
#14 0xffffffff805832ea in fork_exit (
     callout=0xffffffff80585f40 <ithread_loop>, arg=0xffffff00014d8660,
     frame=0xffffff8000032c80) at /usr/src/sys/kern/kern_fork.c:838
#15 0xffffffff8087a24e in fork_trampoline ()
     at /usr/src/sys/amd64/amd64/exception.S:561

--
Kamigishi Rei
KREI-RIPE
fujibayashi.jp