page fault panic -CURRENT

I'm getting a repeatable panic when try to access my cdrom drive. -CURRENT as 
of yesterday.  I seem to get this when I try to mount my cdrom drive a second 
time. 
I seem to get these error sometimes when trying to mount a cd for the first 
time and it doesn't end up work, and the second time I get the panic. 
acd0: FAILURE - READ_CD status=51<READY,DSC,ERROR> sensekey=MEDIUM ERROR 
error=0

(kgdb) bt
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:240
#1  0xc04f8a59 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:372
#2  0xc04f8e38 in panic () at /usr/src/sys/kern/kern_shutdown.c:550
#3  0xc0613fc6 in trap_fatal (frame=0xcdb1cc44, eva=0)
    at /usr/src/sys/i386/i386/trap.c:821
#4  0xc0613c62 in trap_pfault (frame=0xcdb1cc44, usermode=0, eva=28)
    at /usr/src/sys/i386/i386/trap.c:735
#5  0xc061379d in trap (frame=
      {tf_fs = 24, tf_es = 16, tf_ds = 16, tf_edi = 0, tf_esi = -1031146752, 
tf_
ebp = -843985768, tf_isp = -843985808, tf_ebx = -1031197888, tf_edx = 0, 
tf_ecx
= -1066906236, tf_eax = 1, tf_trapno = 12, tf_err = 0, tf_eip = -1068409245, 
tf_
cs = 8, tf_eflags = 66055, tf_esp = -843985744, tf_ss = -1068781253})
    at /usr/src/sys/i386/i386/trap.c:420
#6  0xc0604898 in calltrap () at {standard input}:94
#7  0xc04bfad8 in g_destroy_provider (pp=0xc2892b40)
    at /usr/src/sys/geom/geom_subr.c:426
#8  0xc04bcaa5 in g_orphan_register (pp=0xc289f300)
    at /usr/src/sys/geom/geom_event.c:143
#9  0xc04bcbcc in one_event () at /usr/src/sys/geom/geom_event.c:169
#10 0xc04bcdf5 in g_run_events () at /usr/src/sys/geom/geom_event.c:202
#11 0xc04bde05 in g_event_procbody () at /usr/src/sys/geom/geom_kern.c:134
#12 0xc04e1700 in fork_exit (callout=0xc04bdde0 <g_event_procbody>, arg=0x0,
    frame=0x0) at /usr/src/sys/kern/kern_fork.c:793