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Date: Tue, 15 Apr 1997 22:09:41 -0400 (EDT)
From: Thomas David Rivers <ponds!rivers@dg-rtp.dg.com>
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Subject: kern/3304: NFS V2 readdir hangs
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>Number:         3304
>Category:       kern
>Synopsis:       NFS V2 readdir hangs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Apr 15 22:00:01 PDT 1997
>Last-Modified:
>Originator:     Thomas David Rivers
>Organization:
SAS Institute
>Release:        FreeBSD 2.2.1-STABLE i386
>Environment:

  FreeBSD 2.2.1 - downloaded from ftp.freebsd.org on April 8th.

>Description:

  NFS readdir can hang when accessing V2 servers.  Further access
 the mounted file system is blocked...  It appears that an nfs_send()
 is issued to continue reading the directory; following by an
 nfs_receive() which eventually (via soreceive) blocks in sbwait(), 
 waiting on a packet that never arrives.

  It's not at all clear to me (personally) if this is a problem with
 the NFS protocol (i.e. we've sent, and are waiting on a response from,
 an invalid NFS request) - or some underlying problem with soreceive().

>How-To-Repeat:

  Mount a V2 NFS server (I've tried both Sunos 4.1.3 and HP/UX 9.05),
 go to a rather large directory and do "ls -l".  The ls -l will hang
 in sbwait().  This apparently also needs a rather slow network
 for a reliable reproduction - that is, it's somewhat timing dependent.


>Fix:

  Unknown at this point.
	
>Audit-Trail:
>Unformatted: