Fatal trap 18: integer divide fault while in kernel mode
instruction pointer     = 0x20:0xc0850ec7
stack pointer           = 0x28:0xcc5c49f4
frame pointer           = 0x28:0xcc5c4a3c
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 1041 (madplay)
panic: from debugger
Uptime: 15m2s
Physical memory: 231 MB
Dumping 44 MB: 29 13


(kgdb) bt
#0  doadump () at pcpu.h:166
During symbol reading, Incomplete CFI data; unspecified registers at 0xc04c9313.
#1  0xc04c98c2 in boot (howto=0x104) at ../../../kern/kern_shutdown.c:411
#2  0xc04c9c97 in panic (fmt=0x234 <Address 0x234 out of bounds>) at ../../../kern/kern_shutdown.c:567
#3  0xc044b3c7 in db_panic (addr=0xc0850ec7, have_addr=0x0, count=0xffffffff, modif=0xcc5c47e4 "")
    at ../../../ddb/db_command.c:433
#4  0xc044b7b3 in db_command_loop () at ../../../ddb/db_command.c:401
#5  0xc044d684 in db_trap (type=0x12, code=0x0) at ../../../ddb/db_main.c:222
#6  0xc04eb9d1 in kdb_trap (type=0x0, code=0x0, tf=0x0) at ../../../kern/subr_kdb.c:502
#7  0xc0609e03 in trap_fatal (frame=0xcc5c49b4, eva=0x0) at ../../../i386/i386/trap.c:860
#8  0xc060a3bb in trap (frame=
      {tf_fs = 0x8, tf_es = 0x28, tf_ds = 0x28, tf_edi = 0x0, tf_esi = 0x0, tf_ebp = 0xcc5c4a3c, tf_isp = 0xcc5c49e0, tf_ebx = 0x9000, tf_edx = 0x0, tf_ecx = 0x0, tf_eax = 0x9000, tf_trapno = 0x12, tf_err = 0x0, tf_eip = 0xc0850ec7, tf_cs = 0x20, tf_eflags = 0x10246, tf_esp = 0xc1e1c600, tf_ss = 0x17700}) at ../../../i386/i386/trap.c:660
#9  0xc05fa71a in calltrap () at ../../../i386/i386/exception.s:138
#10 0xc0850ec7 in chn_sync (c=0xc1e1b800, threshold=0x9000)
    at /usr/src/sys/modules/sound/sound/../../../dev/sound/pcm/channel.c:716
#11 0xc0851154 in chn_flush (c=0xc1e1b800) at /usr/src/sys/modules/sound/sound/../../../dev/sound/pcm/channel.c:835
#12 0xc0852f9b in dsp_close (i_dev=0xc1e1c400, flags=0x2, mode=0x2000, td=0xc2057d80)
    at /usr/src/sys/modules/sound/sound/../../../dev/sound/pcm/dsp.c:366
#13 0xc049db1f in giant_close (dev=0xc1e1c400, fflag=0x9000, devtype=0x9000, td=0x9000)
    at ../../../kern/kern_conf.c:284
#14 0xc048784b in devfs_close (ap=0xcc5c4b2c) at ../../../fs/devfs/devfs_vnops.c:352
#15 0xc0613e66 in VOP_CLOSE_APV (vop=0x9000, a=0x0) at vnode_if.c:424
#16 0xc053932a in vn_close (vp=0xc254396c, flags=0x2, file_cred=0x9000, td=0xc2057d80) at vnode_if.h:227
#17 0xc053a658 in vn_closefile (fp=0xc22fc900, td=0x9000) at ../../../kern/vfs_vnops.c:869
#18 0xc04a3954 in fdrop_locked (fp=0xc22fc900, td=0xc2057d80) at file.h:296
#19 0xc04a3c32 in closef (fp=0xc22fc900, td=0xc2057d80) at ../../../kern/kern_descrip.c:1980
#20 0xc04a456d in kern_close (td=0xc2057d80, fd=0x4) at ../../../kern/kern_descrip.c:1027
#21 0xc060a93a in syscall (frame=
      {tf_fs = 0x3b, tf_es = 0x3b, tf_ds = 0x3b, tf_edi = 0xbfbfeb14, tf_esi = 0x1, tf_ebp = 0xbfbfe97c, tf_isp = 0xcc5c4d64, tf_ebx = 0xbfbfeb14, tf_edx = 0x4, tf_ecx = 0x0, tf_eax = 0x6, tf_trapno = 0x16, tf_err = 0x2, tf_eip = 0x28296a9b, tf_cs = 0x33, tf_eflags = 0x246, tf_esp = 0xbfbf115c, tf_ss = 0x3b}) at ../../../i386/i386/trap.c:1010
#22 0xc05fa76f in Xint0x80_syscall () at ../../../i386/i386/exception.s:191