mount freeze, acl system

hi,

i have 2 bugs with nfs.
i recently installed 2 linux rh 7.3. one is 'the nfs test client'. one is mainly a samba server with acl support, all acl stuff (kernel, winbindd, nss, fileutils, e2fsprogs) is installed and seem work, windows users are happy :). On this server i have too configured a nfs server, the export directory is the same than root samba dir which has some special acl set, and there is no quota.

bug 1 :
on the client, after a successfuly nfs mount, when i try to access the mount dir, the process freeze and impossible to kill it. ex: ls /mnt -> freeze, kill -9 doesn't work, umount -f /mnt doesn't work. i used first the redhat kernel, i have tried with last 2.4.19 + linux-2.4.19-NFS_ALL.dif patch, update nfs-utils to 1.0.1, same result.
don't think it will help, but i do some strace ls /mnt, many finish with :
lstat64("/mnt", <unfinished ...>

known bug ? a bad nfs server should not permently block a client, patch ? how can i kill these process without reboot ? is there something that i can do ?

bug 2 :
on the server, after a client successfuly does a mount, all 'basic' access (ls,cd but not samba) on the directory freeze the process as with the client, and the process is unkillable. kernel is 2.4.18 + acl patch. but i haven't try NFS_ALL patch or to update nfs-utils 1.0.1.
strace ls /disk2 result :
stat64("/disk2", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/disk2", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 4
fstat64(4, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
brk(0x8060000) = 0x8060000
getdents64(0x4, 0x805db20, 0x1000, 0x805db20 <unfinished ...>

same questions, is there a patch ?? can i test something ?

my goal is not to have nfs acl (i know there is nfs4), just want correctly mount and copy files.

hope my english is not too bad.
seb

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