unmount(/mnt/nfsx): (0xfffff8008dcd9000): 1 namecache refs, 1 mount refs still present
unmount(/mnt/nfsx): forcing unmount

vflush: Warning, cannot destroy busy device vnode
unmount(/mnt/nfsx): (0xfffff8008dcd9000) unmount: vfs refused to unmount, error 16
unmount(/mnt/nfsx): forced umount of "(null)" - 1 namecache refs, 1 mount refs
unmount(/mnt/nfsx): (0xfffff8008dcd9000): 1 namecache refs, 1 mount refs still present
unmount(/mnt/nfsx): forcing unmount

vflush: Warning, cannot destroy busy device vnode
unmount(/mnt/nfsx): (0xfffff8008dcd9000) unmount: vfs refused to unmount, error 16
unmount(/mnt/nfsx): forced umount of "(null)" - 1 namecache refs, 1 mount refs
unmount(/mnt/nfsx): (0xfffff8008dcd9000): 1 namecache refs, 1 mount refs still present
unmount(/mnt/nfsx): forcing unmount

vflush: Warning, cannot destroy busy device vnode
unmount(/mnt/nfsx): (0xfffff8008dcd9000) unmount: vfs refused to unmount, error 16