Some more information: this seems to be related to the mount path being below a symlink.
On smbsrv, /mount/deep is a symlink to /mount/other
this works: # mount.cifs //smbsrv/mount/other/path/ /mnt/ -o user=me,dom=mydomain Password: # umount /mnt
this causes oops: # mount.cifs //smbsrv/mount/deep/path/ /mnt/ -o user=me,dom=mydomain Password: Killed
Some more information: this seems to be related to the mount path being below a symlink.
On smbsrv, /mount/deep is a symlink to /mount/other
this works: mount/other/ path/ /mnt/ -o user=me, dom=mydomain
# mount.cifs //smbsrv/
Password:
# umount /mnt
this causes oops: mount/deep/ path/ /mnt/ -o user=me, dom=mydomain
# mount.cifs //smbsrv/
Password:
Killed