lagi-lagi sack bikin panic 6.0-current

dicurigai sack_option () di FreeBSD-6.0-CURRENT bikin panic kernel.
berikut ini hasil kgdb:
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#0 doadump () at pcpu.h:165
in pcpu.h
(kgdb) bt
#0 doadump () at pcpu.h:165
#1 0xc0526110 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:397
#2 0xc05263bb in panic (fmt=0xc06dc69f "cur != NULL")
at /usr/src/sys/kern/kern_shutdown.c:553
#3 0xc05bd3ac in tcp_sack_option (tp=0xc2013000, th=0xd443eb14,
cp=0xc1af2056 "\005\nwF\212|wF\217\0017\0010\0012\0010\0010\0010\0011\0010\0013\0010\0010\0010\0010\0013\001d\0010\00
11\0010\0010\0012\003ip6\004arpa",
optlen=0) at /usr/src/sys/netinet/tcp_sack.c:478
#4 0xc05bb327 in tcp_dooptions (tp=0xc2013000, to=0xd443ec78,
cp=0xc1af2056 "\005\nwF\212|wF\217\0017\0010\0012\0010\0010\0010\0011\0010\0013\0010\0010\0010\0010\0013\001d\0010\00
11\0010\0010\0012\003ip6\004arpa",
cnt=10, is_syn=0, th=0xc1af2034) at /usr/src/sys/netinet/tcp_input.c:2647
#5 0xc05b8dfb in tcp_input (m=0xc1ad6600, off0=65800)
at /usr/src/sys/netinet/tcp_input.c:1085
#6 0xc05adcd5 in ip_input (m=0xc1ad6600)
at /usr/src/sys/netinet/ip_input.c:776
#7 0xc0597f42 in netisr_processqueue (ni=0xc0783318)
at /usr/src/sys/net/netisr.c:235
#8 0xc059812a in swi_net (dummy=0x0) at /usr/src/sys/net/netisr.c:348
#9 0xc0513940 in ithread_loop (arg=0xc19db180)
at /usr/src/sys/kern/kern_intr.c:546
#10 0xc0512dd4 in fork_exit (callout=0xc0513820 ,
arg=0xc19db180, frame=0xd443ed38) at /usr/src/sys/kern/kern_fork.c:789
#11 0xc0685e3c in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:208
(kgdb) quit
>

si Kris Kenneway memberitahukan saya via milis -current katanya panic dimulai pada frame ke-3. Dia juga bilang kejadian ini mirip yng dia alami. Tapi Mohan Srinivasan (Yahoo! Inc) mengatakan kejadian ini sedikit berbeda dng yng dialami oleh Kris Kenneway.
Jadi aja gue mesti meng-upload vmcore.1 (550 MB) ke web server yang nanti vmcore.1 tersebut akan didownload dan dianalisis oleh Mohan Srinivasan juga oleh Demizu-san.