mount that cant be killed

[Tsu-Fan Cheng]

hi,
   just found out that i have some mount process that cant be killed. I was
trying to mount a digital photo frame but failed, I issued "mount_msdos
/dev/da0 /mnt" on console. After seeing it not returned, I login from
another console and killed the previous login. Now the mount process is
still there. what should I do instead of reboot?? thanks!!

TFC