This happened when playing a CD via xmms:

uvm_fault(0xc06c39e0, 0xcc60e000, 0, 1) -> 0xe
fatal page fault in supervisor mode
trap type 6 code 0 eip c03e5ccb cs 8 eflags 10206 cr2 cc60e36e ilevel 0
panic: trap
Begin traceback...
trap() at netbsd:trap+0x149
--- trap (number 6) ---
cd_set_pa_immed(c1750400,0,0,c1750400,0) at netbsd:cd_set_pa_immed+0x5b
cdioctl(f03,80066319,cc603ea4,5,cc631800) at netbsd:cdioctl+0x516
spec_ioctl(cc603d84,cdc289ec,cc631800,c036cb72,c052d0c0) at netbsd:spec_ioctl+0x6e
VOP_IOCTL(cf0e32a0,80066319,cc603ea4,5,cb060f6c) at netbsd:VOP_IOCTL+0x40
vn_ioctl(cc54cd2c,80066319,cc603ea4,cc631800,0) at netbsd:vn_ioctl+0x9a
sys_ioctl(cc5448cc,cc603f64,cc603f5c,0,cc603fa4) at netbsd:sys_ioctl+0x122
syscall_plain() at netbsd:syscall_plain+0x7e
--- syscall (number 54) ---
0xbd91997b:
End traceback...



		--Steve Bellovin, http://www.cs.columbia.edu/~smb