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

[Kostik Belousov]

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

From: Kostik Belousov <kostikbel at gmail.com>
To: Ulrich Spoerlein <uspoerlein at gmail.com>
Cc: 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 16:28:09 +0200

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 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)
 >=20
 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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