Hello, i have a machine that locks up occasionally when trying to
unmount a cifs mount. The program unmounting it uses the umount2 syscall
to do the unmounting. 

I got these messages along with the stack trace in syslog
kernel: note: umount.special[18370] exited with preempt_count 1
kernel: BUG: umount.special/18370, lock held at task exit time!

Does this mean there is a bug in the kernel, or am i doing something
wrong in the umount.special process?

Attached is the full crash log and the source to umount.special

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Info:
Machine i386/Xeon
Kernel versions: 2.6.17.11, and 2.6.16.7
Distro: Debian Sarge(3.1)

Any help would be appreciated.