kernel panic 6.0-CURRENT #0: Tue Jul 5 14:47:32 MSD 2005

This is
SMP (HTT)
ADAPTIVE_GIANT
PREEMTION
IPI_PREEMTION
ftp server with 8 ata disks

(kgdb) bt
#0  doadump () at pcpu.h:165
#1  0xc04c568d in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:397
#2  0xc04c5e31 in panic (fmt=0xc064610b "%s") at 
/usr/src/sys/kern/kern_shutdown.c:553
#3  0xc062bbaa in trap_fatal (frame=0xd6b55a40, eva=12) at 
/usr/src/sys/i386/i386/trap.c:840
#4  0xc062be5e in trap_pfault (frame=0xd6b55a40, usermode=0, eva=12) at 
/usr/src/sys/i386/i386/trap.c:751
#5  0xc062c284 in trap (frame=
      {tf_fs = 8, tf_es = -1068695512, tf_ds = -1045037016, tf_edi = 5944, 
tf_esi = 0, tf_ebp = -692757836, tf_isp = -692757908, tf_ebx = -1042527440, 
tf_edx = -1045200896, tf_ecx = 52572, tf_eax = 2046, tf_trapno = 12, tf_err 
= 0, tf_eip = -1068466942, tf_cs = 32, tf_eflags = 66050, tf_esp 
= -1042527488, tf_ss = 256}) at /usr/src/sys/i386/i386/trap.c:441
#6  0xc0611c2a in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7  0x00000008 in ?? ()
#8  0xc04d0028 in sysctl_handle_string (oidp=0xc191d500, arg1=0x1738, 
arg2=1348, req=0x1)
    at /usr/src/sys/kern/kern_sysctl.c:888
#9  0xc05782b8 in tcp_output (tp=0xc1c9d000) at 
/usr/src/sys/netinet/tcp_output.c:774
#10 0xc0580227 in tcp_usr_send (so=0x0, flags=0, m=0xc17de500, nam=0x0, 
control=0x0, td=0xc1b6d780)
    at /usr/src/sys/netinet/tcp_usrreq.c:702
#11 0xc050a8b8 in sosend (so=0xc1b38000, addr=0x0, uio=0xd6b55c70, 
top=0xc17de500, control=0x0, flags=0, td=0xc1b6d780)
    at /usr/src/sys/kern/uipc_socket.c:829
#12 0xc04fb952 in soo_write (fp=0x0, uio=0xd6b55c70, active_cred=0xc1cbcd80, 
flags=0, td=0xc1b6d780)
    at /usr/src/sys/kern/sys_socket.c:118
#13 0xc04f413c in dofilewrite (td=0xc1b6d780, fp=0xc1b6a1f8, fd=15, buf=0x0, 
nbyte=1024, offset=Unhandled dwarf expression opcode 0x93
) at file.h:246
#14 0xc04f4397 in write (td=0xc1b6d780, uap=0xd6b55d04) at 
/usr/src/sys/kern/sys_generic.c:302
#15 0xc062c763 in syscall (frame=
      {tf_fs = 59, tf_es = -1078001605, tf_ds = -1078001605, tf_edi = 
135602228, tf_esi = 1024, tf_ebp = -1077942936, tf_isp = -692757148, tf_ebx 
= 0, tf_edx = 1, tf_ecx = 15, tf_eax = 4, tf_trapno = 0, tf_err = 2, tf_eip 
= 672572175, tf_cs = 51, tf_eflags = 582, tf_esp = -1077942980, tf_ss = 59}) 
at /usr/src/sys/i386/i386/trap.c:985
#16 0xc0611c7f in Xint0x80_syscall () at 
/usr/src/sys/i386/i386/exception.s:200
#17 0x0000003b in ?? ()
#18 0xbfbf003b in ?? ()
#19 0xbfbf003b in ?? ()
#20 0x08152034 in ?? ()
#21 0x00000400 in ?? ()
#22 0xbfbfe568 in ?? ()
#23 0xd6b55d64 in ?? ()
#24 0x00000000 in ?? ()
#25 0x00000001 in ?? ()
#26 0x0000000f in ?? ()
#27 0x00000004 in ?? ()
#28 0x00000000 in ?? ()
#29 0x00000002 in ?? ()
#30 0x2816a30f in ?? ()
#31 0x00000033 in ?? ()
#32 0x00000246 in ?? ()
#33 0xbfbfe53c in ?? ()
#34 0x0000003b in ?? ()
#35 0x00000000 in ?? ()
#36 0x00000000 in ?? ()
#37 0x00000000 in ?? ()
#38 0x00000000 in ?? ()
#39 0x014df000 in ?? ()
#40 0xc1b6ca3c in ?? ()
#41 0xc1b6d780 in ?? ()
#42 0xd6b55888 in ?? ()
#43 0xd6b5586c in ?? ()
#44 0xc1617c00 in ?? ()
#45 0xc04dcc1a in sched_switch (td=0x400, newtd=0x0, flags=Cannot access 
memory at address 0xbfbfe578
) at /usr/src/sys/kern/sched_4bsd.c:973