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

[John Merryweather Cooper]

The following reply was made to PR kern/92785; it has been noted by GNATS.

From: John Merryweather Cooper <john_m_cooper at yahoo.com>
To: Kostik Belousov <kostikbel at gmail.com>
Cc: Ulrich Spoerlein <uspoerlein at gmail.com>,  stable at freebsd.org, 
 bug-followup at freebsd.org
Subject: Re: kern/92785: Using exported filesystem on OS/2 NFS client causes
 filesystem freeze
Date: Fri, 15 Dec 2006 19:54:25 -0500

 Kostik Belousov wrote:
 > 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.
 >   
 Yes, OS/2 supports the ".." directory.  FAT, HPFS, and JFS all have a 
 ".." directory.
 
 jmc