kern/92785: Using exported filesystem on OS/2 NFS client causes filesystem freeze

[Kostik Belousov]

On Fri, Dec 15, 2006 at 03:12:58PM +0100, Ulrich Spoerlein wrote:
> A tcpdump of the session can be found at:
> http://coyote.dnsalias.net/rpc.pcap (9kB)
> 
Am I right that all you did was ls -l <root of nfs mount> ? Does OS/2
supports the notion of ".." directory ? Could you do just "ls -l .."
from nfs client and then try "stat <root of exported fs>" on the server
(i think it shall hang) ?

My hypothesis is that LOOKUP RPC for ".." causes directory vnode lock
leak in nfs_namei. After that, mountd hang is just consequence.
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