The umount -a command in /etc/rc.d/init.d/halt script was hanging my
computer with a iput: inode count wrapped error. I solved this by
removing the /proc/bus/usb entry from /etc/mtab prior to calling the
umount command.

Does the /proc/bus/usb system need to be unmounted? Is there any chance
of file corruption or other problems if this is not done?

Other people have not posted this error, therefore  umount must be
unmounting the /proc/bus/usb filesystem without problems. Why would the
usb filesystem give such an error? Anybody have any ideas about
troubleshooting this further? 

-- 
Sundeep Mediratta

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