panic: vm_object_madvise: page 0xfffffe0413c58630 is fictitious

FreeBSD bbb.ccc 10.0-CURRENT FreeBSD 10.0-CURRENT #0:
Fri Nov 23 17:00:40 CET 2012
aaa_at_bbb.ccc:/usr/obj/usr/src/head/sys/GENERIC  amd64

#0  doadump (textdump=-2014022336) at pcpu.h:229
#1  0xffffffff8033e2d2 in db_fncall (dummy1=<value optimized out>, 
dummy2=<value optimized out>,
     dummy3=<value optimized out>, dummy4=<value optimized out>)
     at /usr/src/head/sys/ddb/db_command.c:578
#2  0xffffffff8033e074 in db_command (last_cmdp=<value optimized out>,
     cmd_table=<value optimized out>, dopager=1) at 
/usr/src/head/sys/ddb/db_command.c:449
#3  0xffffffff8033dd62 in db_command_loop () at 
/usr/src/head/sys/ddb/db_command.c:502
#4  0xffffffff80340690 in db_trap (type=<value optimized out>, code=0)
     at /usr/src/head/sys/ddb/db_main.c:231
#5  0xffffffff808b375e in kdb_trap (type=3, code=0, tf=<value optimized 
out>)
     at /usr/src/head/sys/kern/subr_kdb.c:654
#6  0xffffffff80bfc71a in trap (frame=0xffffff8487f478a0)
     at /usr/src/head/sys/amd64/amd64/trap.c:579
#7  0xffffffff80be65b2 in calltrap () at /tmp/exception-3nQ6Cf.s:179
#8  0xffffffff808b2f5e in kdb_enter (why=0xffffffff80e5e23b "panic", 
msg=<value optimized out>)
     at cpufunc.h:63
#9  0xffffffff8088086f in panic (fmt=<value optimized out>)
     at /usr/src/head/sys/kern/kern_shutdown.c:628
#10 0xffffffff80adea4a in vm_object_madvise (object=<value optimized out>,
     pindex=<value optimized out>, end=8952, advise=<value optimized out>)
     at /usr/src/head/sys/vm/vm_object.c:1101
#11 0xffffffff80ad759a in vm_map_madvise (map=0xfffffe0018260188, 
start=<value optimized out>,
     end=<value optimized out>, behav=5) at 
/usr/src/head/sys/vm/vm_map.c:2140
#12 0xffffffff80adbd8d in sys_madvise (td=<value optimized out>, 
uap=<value optimized out>)
     at /usr/src/head/sys/vm/vm_mmap.c:752
#13 0xffffffff80bfd3a5 in amd64_syscall (td=0xfffffe0018230000, 
traced=0) at subr_syscall.c:135
#14 0xffffffff80be689b in Xfast_syscall () at /tmp/exception-3nQ6Cf.s:329
#15 0x00000000016f3bfa in ?? ()