panic: 1 vncache entries remaining (Current from April 21)

I have a panic while shutting down my notebook today:

Unread portion of the kernel message buffer:
<118>Terminated
<118>.
<118>Apr 23 06:50:02 orion syslogd: exiting on signal 15
Waiting (max 60 seconds) for system process `vnlru' to stop...done
Waiting (max 60 seconds) for system process `bufdaemon' to stop...done
Waiting (max 60 seconds) for system process `syncer' to stop...
Syncing disks, vnodes remaining...0 0 done
All buffers synced.
Uptime: 4h29m32s
GEOM_JOURNAL: Shutting down geom gjournal 3531068371.
panic: 1 vncache entries remaining
cpuid = 0
KDB: enter: panic
panic: from debugger
cpuid = 0
Uptime: 4h29m37s
Physical memory: 1003 MB
Dumping 114 MB: 99 83 67 51 35 19 3

#0  doadump () at pcpu.h:172
172             __asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) bt
#0  doadump () at pcpu.h:172
#1  0xc06c3f18 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xc06c4222 in panic (fmt=0xc090a1cc "from debugger") at /usr/src/sys/kern/kern_shutdown.c:563
#3  0xc0479a76 in db_panic (addr=-1066519965, have_addr=0, count=-1, modif=0xe2885a04 "") at /usr/src/sys/ddb/db_command.c:433
#4  0xc0479a0f in db_command (last_cmdp=0xc0a252a4, cmd_table=0x0) at /usr/src/sys/ddb/db_command.c:401
#5  0xc0479aca in db_command_loop () at /usr/src/sys/ddb/db_command.c:453
#6  0xc047b715 in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_main.c:222
#7  0xc06e353c in kdb_trap (type=3, code=0, tf=0xe2885b9c) at /usr/src/sys/kern/subr_kdb.c:502
#8  0xc08c13a5 in trap (frame=0xe2885b9c) at /usr/src/sys/i386/i386/trap.c:621
#9  0xc08ab32b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#10 0xc06e3263 in kdb_enter (msg=0x12 <Address 0x12 out of bounds>) at cpufunc.h:60
#11 0xc06c41d4 in panic (fmt=0xc0944a15 "%d vncache entries remaining") at /usr/src/sys/kern/kern_shutdown.c:547
#12 0xc068287b in pfs_vncache_unload () at /usr/src/sys/fs/pseudofs/pseudofs_vncache.c:102
#13 0xc068261d in pfs_modevent (mod=0xc3ed5c00, evt=18, arg=0x0) at /usr/src/sys/fs/pseudofs/pseudofs.c:438
#14 0xc06ba991 in module_shutdown (arg1=0x0, arg2=16392) at /usr/src/sys/kern/kern_module.c:105
#15 0xc06c3f97 in boot (howto=16392) at /usr/src/sys/kern/kern_shutdown.c:412
#16 0xc06c3880 in reboot (td=0xc3ef7360, uap=0x12) at /usr/src/sys/kern/kern_shutdown.c:169
#17 0xc08c1bee in syscall (frame=0xe2885d38) at /usr/src/sys/i386/i386/trap.c:1016
#18 0xc08ab390 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:196
#19 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)

-- 
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- Best regards, Nikolay Pavlov. <<<-----------------------------------    
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