[3.6-rc3] rdirplus broken? (EBUSY)

[Simon Kirby <sim@hostway.ca>]

Hello!

Something seems broiken in 3.6-rc[123] which was fine in 3.5 and earlier.
This is a 3.4.1 knfsd server with ext3 and XFS-based NFS exports:

/	192.168.13.0/24(rw,no_root_squash,no_subtree_check,async)
/pics	192.168.13.0/24(rw,no_root_squash,no_subtree_check,async)
/raid	192.168.13.0/24(rw,no_root_squash,no_subtree_check,async)

and a 3.6-rc3 client with this in fstab:

flick:/		/flick		nfs	rw,vers=3
flick:/raid	/flick/raid	nfs	rw,vers=3
flick:/pics	/flick/pics	nfs	rw,vers=3

This seems to fail now as follows:

[sroot@oof:/]# mount flick
[sroot@oof:/]# mount flick/raid
[sroot@oof:/]# mount flick/pics
[sroot@oof:/]# ls -l flick
ls: cannot access flick/pics: Device or resource busy
ls: cannot access flick/raid: Device or resource busy
total 2180
drwxr-xr-x  45 root root    4096 Jun 18 14:19 ./
drwxr-xr-x  58 root root    4096 Jul  3 22:24 ../
...
??????????   ? ?    ?          ?            ? pics
??????????   ? ?    ?          ?            ? raid
...
[sroot@oof:/]# cd flick/pics
flick/pics: Device or resource busy.

These mount points are now stuck and cannot be unmounted until
I reboot (umount -l fails with EBUSY).

If I mount with "nordirplus", I can't seem to get it to break. However,
sometimes it will work regardless. I can bisect this if it would help..

Simon-