Accessing mounted NFS filesystem hang when crossmnt specified on server

I have Ubuntu server on kernel 2.6.28.

My exports:
/mnt		*(sec=none,ro,fsid=0,crossmnt,insecure,no_subtree_check,sync,no_root_squash)
/home/ide	*(ro,fsid=1,insecure,no_subtree_check,sync,anonuid=65534,anongid=65534)

When I mount this file system from other host with
mount -t nfs4 -o sec=none,proto=tcp,intr 10.80.1.112:/ /mnt/KVM_quad
it is mounted successfully.

But after "ls /mnt/KVM_quad", command stuck completely.

If I remove crossmnt from exports everything work OK. -t nfs, -t nfs4
- all the same. security=sys, security=none - all the same....

in /mnt dir (on nfs server) I have 10 file systems (LVM) mounted in
subdirs of /mnt. All of them are accessible.

dmesg on both systems are clear.

--

-- 
Segmentation fault
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