Unable to kill a failed umount processus.

[Francois Pussault]

Hi all,

I tried to umount a usb stick vfat on 5.2 x86, using normal : # umount -f 
/dev/sd2i 

then process umount never ends, neither cannot be killed even with a # kill -9 

the /dev/sd2i is still mounted to /mnt2 but not visible with df command (only 
mount command shows it as mounted)

any idea should be welcome.

thanks.