samba crashes on 10.4 - after canpnicalize_connect_path failure

I'm have problems with my main file server, which has started crashing when trying to stream/transfer large files. The following is the log for one of the clients that was trying to stream a file..... I get around 100 lines reporting the canonicalize_connect_path failure, then...

[2010/06/22 09:59:57, 0] smbd/service.c:988(make_connection_snum)
  canonicalize_connect_path failed for service Odds & Ends, path /media/LACIE/Odds & Ends
[2010/06/22 10:00:10, 0] lib/sharesec.c:268(delete_share_security)
  delete_share_security: Failed to delete entry for share Odds & Ends: NT_STATUS_NOT_FOUND
[2010/06/22 10:00:10, 0] param/loadparm.c:8569(process_usershare_file)
  process_usershare_file: stat of /var/lib/samba/usershares/odds & ends failed. Permission denied
[2010/06/22 10:00:10, 1] smbd/service.c:1063(make_connection_snum)
  mint (::ffff:192.168.1.219) connect to service odds & ends initially as user stephen (uid=1000, gid=1000) (pid 2325)
[2010/06/22 10:00:11, 0] param/loadparm.c:8569(process_usershare_file)
  process_usershare_file: stat of /var/lib/samba/usershares/odds & ends failed. Permission denied
[2010/06/22 10:00:11, 0] param/loadparm.c:8569(process_usershare_file)
  process_usershare_file: stat of /var/lib/samba/usershares/odds & ends failed. Permission denied
[2010/06/22 10:00:11, 0] param/loadparm.c:8569(process_usershare_file)
  process_usershare_file: stat of /var/lib/samba/usershares/odds & ends failed. Permission denied
[2010/06/22 10:00:11, 0] lib/substitute.c:560(alloc_sub_basic)
  alloc_sub_basic: NULL source string! This should not happen
[2010/06/22 10:00:11, 0] lib/fault.c:46(fault_report)
  ===============================================================
[2010/06/22 10:00:11, 0] lib/fault.c:47(fault_report)
  INTERNAL ERROR: Signal 11 in pid 2325 (3.4.7)
  Please read the Trouble-Shooting section of the Samba3-HOWTO
[2010/06/22 10:00:11, 0] lib/fault.c:49(fault_report)

  From: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf
[2010/06/22 10:00:11, 0] lib/fault.c:50(fault_report)
  ===============================================================
[2010/06/22 10:00:11, 0] lib/util.c:1480(smb_panic)
  PANIC (pid 2325): internal error
[2010/06/22 10:00:11, 0] lib/util.c:1584(log_stack_trace)
  BACKTRACE: 22 stack frames:
   #0 smbd(log_stack_trace+0x2d) [0xa5757d]
   #1 smbd(smb_panic+0x2d) [0xa5769d]
   #2 smbd(+0x31cbee) [0xa44bee]
   #3 [0x12d400]
   #4 smbd(push_ucs2+0x97) [0xa422b7]
   #5 smbd(E_md4hash+0x43) [0x88b0d3]
   #6 smbd(create_volume_objectid+0x3f) [0x8035df]
   #7 smbd(+0xbcdbd) [0x7e4dbd]
   #8 smbd(+0xbfd15) [0x7e7d15]
   #9 smbd(reply_nttrans+0x813) [0x7ea2b3]
   #10 smbd(+0x112b6e) [0x83ab6e]
   #11 smbd(+0x112fdd) [0x83afdd]
   #12 smbd(+0x1138b8) [0x83b8b8]
   #13 smbd(run_events+0x124) [0xa68c74]
   #14 smbd(smbd_process+0x7d2) [0x83a402]
   #15 smbd(+0x615978) [0xd3d978]
   #16 smbd(run_events+0x124) [0xa68c74]
   #17 smbd(+0x340f1f) [0xa68f1f]
   #18 smbd(_tevent_loop_once+0x98) [0xa69568]
   #19 smbd(main+0xcaa) [0xd3e6ba]
   #20 /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6) [0xf02bd6]
   #21 smbd(+0x8b231) [0x7b3231]
[2010/06/22 10:00:11, 0] lib/util.c:1485(smb_panic)
  smb_panic(): calling panic action [/usr/share/samba/panic-action 2325]
[2010/06/22 10:00:11, 0] lib/util.c:1493(smb_panic)
  smb_panic(): action returned status 0
[2010/06/22 10:00:11, 0] lib/fault.c:326(dump_core)
  dumping core in /var/log/samba/cores/smbd
[2010/06/22 10:00:11, 1] smbd/service.c:1063(make_connection_snum)
  mint (::ffff:192.168.1.219) connect to service Odds & Ends initially as user stephen (uid=1000, gid=1000) (pid 2394)

Here is my smb.conf

#
# Sample configuration file for the Samba suite for Debian GNU/Linux.
#
#
# This is the main Samba configuration file. You should read the
# smb.conf(5) manual page in order to understand the options listed
# here. Samba has a huge number of configurable options most of which
# are not shown in this example
#
# Some options that are often worth tuning have been included as
# commented-out examples in this file.
# - When such options are commented with ";", the proposed setting
# differs from the default Samba behaviour
# - When commented with "#", the proposed setting is the default
# behaviour of Samba but the option is considered important
# enough to be mentioned here
#
# NOTE: Whenever you modify this file you should run the command
# "testparm" to check that you have not made any basic syntactic
# errors.
# A well-established practice is to name the original file
# "smb.conf.master" and create the "real" config file with
# testparm -s smb.conf.master >smb.conf
# This minimizes the size of the really used smb.conf file
# which, according to the Samba Team, impacts performance
# However, use this with caution if your smb.conf file contains nested
# "include" statements. See Debian bug #483187 for a case
# where using a master file is not a good idea.
#

#======================= Global Settings =======================

[global]

## Browsing/Identification ###

# Change this to the workgroup/NT-domain name your Samba server will part of
 workgroup = workgroup

# server string is the equivalent of the NT Description field
 server string = %h server (Samba, Ubuntu)

# Windows Internet Name Serving Support Section:
# WINS Support - Tells the NMBD component of Samba to enable its WINS Server
 wins support = yes

# WINS Server - Tells the NMBD components of Samba to be a WINS Client
# Note: Samba can be either a WINS Server, or a WINS Client, but NOT both
; wins server = w.x.y.z

# This will prevent nmbd to search for NetBIOS names through DNS.
 dns proxy = no

# What naming service and in what order should we use to resolve host names
# to IP addresses
; name resolve order = lmhosts host wins bcast

#### Networking ####

# The specific set of interfaces / networks to bind to
# This can be either the interface name or an IP address/netmask;
# interface names are normally preferred
; interfaces = 127.0.0.0/8 eth0

# Only bind to the named interfaces and/or networks; you must use the
# 'interfaces' option above to use this.
# It is recommended that you enable this feature if your Samba machine is
# not protected by a firewall or is a firewall itself. However, this
# option cannot handle dynamic or non-broadcast interfaces correctly.
; bind interfaces only = yes

#### Debugging/Accounting ####

# This tells Samba to use a separate log file for each machine
# that connects
 log file = /var/log/samba/log.%m

# Cap the size of the individual log files (in KiB).
 max log size = 1000

# If you want Samba to only log through syslog then set the following
# parameter to 'yes'.
# syslog only = no

# We want Samba to log a minimum amount of information to syslog. Everything
# should go to /var/log/samba/log.{smbd,nmbd} instead. If you want to log
# through syslog you should set the following parameter to something higher.
 syslog = 0

# Do something sensible when Samba crashes: mail the admin a backtrace
 panic action = /usr/share/samba/panic-action %d

####### Authentication #######

# "security = user" is always a good idea. This will require a Unix account
# in this server for every user accessing the server. See
# /usr/share/doc/samba-doc/htmldocs/Samba3-HOWTO/ServerType.html
# in the samba-doc package for details.
 security = user

# You may wish to use password encryption. See the section on
# 'encrypt passwords' in the smb.conf(5) manpage before enabling.
 encrypt passwords = true

# If you are using encrypted passwords, Samba will need to know what
# password database type you are using.
; passdb backend = tdbsam

 obey pam restrictions = yes

# This boolean parameter controls whether Samba attempts to sync the Unix
# password with the SMB password when the encrypted SMB password in the
# passdb is changed.
 unix password sync = yes

# For Unix password sync to work on a Debian GNU/Linux system, the following
# parameters must be set (thanks to Ian Kahan <<email address hidden> for
# sending the correct chat script for the passwd program in Debian Sarge).
 passwd program = /usr/bin/passwd %u
 passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .

# This boolean controls whether PAM will be used for password changes
# when requested by an SMB client instead of the program listed in
# 'passwd program'. The default is 'no'.
 pam password change = yes

# This option controls how unsuccessful authentication attempts are mapped
# to anonymous connections
 map to guest = bad user

########## Domains ###########

# Is this machine able to authenticate users. Both PDC and BDC
# must have this setting enabled. If you are the BDC you must
# change the 'domain master' setting to no
#
; domain logons = yes
#
# The following setting only takes effect if 'domain logons' is set
# It specifies the location of the user's profile directory
# from the client point of view)
# The following required a [profiles] share to be setup on the
# samba server (see below)
; logon path = \\%N\profiles\%U
# Another common choice is storing the profile in the user's home directory
# (this is Samba's default)
# logon path = \\%N\%U\profile

# The following setting only takes effect if 'domain logons' is set
# It specifies the location of a user's home directory (from the client
# point of view)
; logon drive = H:
# logon home = \\%N\%U

# The following setting only takes effect if 'domain logons' is set
# It specifies the script to run during logon. The script must be stored
# in the [netlogon] share
# NOTE: Must be store in 'DOS' file format convention
; logon script = logon.cmd

# This allows Unix users to be created on the domain controller via the SAMR
# RPC pipe. The example command creates a user account with a disabled Unix
# password; please adapt to your needs
; add user script = /usr/sbin/adduser --quiet --disabled-password --gecos "" %u

# This allows machine accounts to be created on the domain controller via the
# SAMR RPC pipe.
# The following assumes a "machines" group exists on the system
; add machine script = /usr/sbin/useradd -g machines -c "%u machine account" -d /var/lib/samba -s /bin/false %u

# This allows Unix groups to be created on the domain controller via the SAMR
# RPC pipe.
; add group script = /usr/sbin/addgroup --force-badname %g

########## Printing ##########

# If you want to automatically load your printer list rather
# than setting them up individually then you'll need this
; load printers = yes

# lpr(ng) printing. You may wish to override the location of the
# printcap file
; printing = bsd
; printcap name = /etc/printcap

# CUPS printing. See also the cupsaddsmb(8) manpage in the
# cupsys-client package.
; printing = cups
 printcap name = cups

############ Misc ############

# Using the following line enables you to customise your configuration
# on a per machine basis. The %m gets replaced with the netbios name
# of the machine that is connecting
; include = /home/samba/etc/smb.conf.%m

# Most people will find that this option gives better performance.
# See smb.conf(5) and /usr/share/doc/samba-doc/htmldocs/Samba3-HOWTO/speed.html
# for details
# You may want to add the following on a Linux system:
# SO_RCVBUF=8192 SO_SNDBUF=8192
# socket options = TCP_NODELAY

# The following parameter is useful only if you have the linpopup package
# installed. The samba maintainer and the linpopup maintainer are
# working to ease installation and configuration of linpopup and samba.
; message command = /bin/sh -c '/usr/bin/linpopup "%f" "%m" %s; rm %s' &

# Domain Master specifies Samba to be the Domain Master Browser. If this
# machine will be configured as a BDC (a secondary logon server), you
# must set this to 'no'; otherwise, the default behavior is recommended.
# domain master = auto

# Some defaults for winbind (make sure you're not using the ranges
# for something else.)
; idmap uid = 10000-20000
; idmap gid = 10000-20000
; template shell = /bin/bash

# The following was the default behaviour in sarge,
# but samba upstream reverted the default because it might induce
# performance issues in large organizations.
# See Debian bug #368251 for some of the consequences of *not*
# having this setting and smb.conf(5) for details.
; winbind enum groups = yes
; winbind enum users = yes

# Setup usershare options to enable non-root users to share folders
# with the net usershare command.

# Maximum number of usershare. 0 (default) means that usershare is disabled.
; usershare max shares = 100

# Allow users who've been granted usershare privileges to create
# public shares, not just authenticated ones
 usershare allow guests = yes
 username map = /etc/samba/smbusers

#======================= Share Definitions =======================

# Un-comment the following (and tweak the other settings below to suit)
# to enable the default home directory shares. This will share each
# user's home directory as \\server\username
;[homes]
; comment = Home Directories
; browseable = no

# By default, the home directories are exported read-only. Change the
# next parameter to 'no' if you want to be able to write to them.
; read only = yes

# File creation mask is set to 0700 for security reasons. If you want to
# create files with group=rw permissions, set next parameter to 0775.
; create mask = 0700

# Directory creation mask is set to 0700 for security reasons. If you want to
# create dirs. with group=rw permissions, set next parameter to 0775.
; directory mask = 0700

# By default, \\server\username shares can be connected to by anyone
# with access to the samba server. Un-comment the following parameter
# to make sure that only "username" can connect to \\server\username
# This might need tweaking when using external authentication schemes
; valid users = %S

# Un-comment the following and create the netlogon directory for Domain Logons
# (you need to configure Samba to act as a domain controller too.)
;[netlogon]
; comment = Network Logon Service
; path = /home/samba/netlogon
; guest ok = yes
; read only = yes
; share modes = no

# Un-comment the following and create the profiles directory to store
# users profiles (see the "logon path" option above)
# (you need to configure Samba to act as a domain controller too.)
# The path below should be writable by all users so that their
# profile directory may be created the first time they log on
;[profiles]
; comment = Users profiles
; path = /home/samba/profiles
; guest ok = no
; browseable = no
; create mask = 0600
; directory mask = 0700

[printers]
 comment = All Printers
 browseable = no
 path = /var/spool/samba
 printable = yes
; guest ok = no
; read only = yes
 create mask = 0700

# Windows clients look for this share name as a source of downloadable
# printer drivers
[print$]
 comment = Printer Drivers
 path = /var/lib/samba/printers
; browseable = yes
 writeable = yes
 guest ok = yes
# Uncomment to allow remote administration of Windows print drivers.
# You may need to replace 'lpadmin' with the name of the group your
# admin users are members of.
# Please note that you also need to set appropriate Unix permissions
# to the drivers directory for these users to have write rights in it
; write list = root, @lpadmin

# A sample share for sharing your CD-ROM with others.
;[cdrom]
; comment = Samba server's CD-ROM
; read only = yes
; locking = no
; path = /cdrom
; guest ok = yes

# The next two parameters show how to auto-mount a CD-ROM when the
# cdrom share is accesed. For this to work /etc/fstab must contain
# an entry like this:
#
# /dev/scd0 /cdrom iso9660 defaults,noauto,ro,user 0 0
#
# The CD-ROM gets unmounted automatically after the connection to the
#
# If you don't want to use auto-mounting/unmounting make sure the CD
# is mounted on /cdrom
#
; preexec = /bin/mount /cdrom
; postexec = /bin/umount /cdrom

[disk-1]
 comment = Tumeric 1
 path = /media/disk-1
 writeable = yes
; browseable = yes
 guest ok = yes

[LACIE]
 comment = Tumeric Lacie
 path = /media/LACIE
 writeable = yes
; browseable = yes
 guest ok = yes

[Torrent.load]
 comment = Torrent.load
 path = /home/stephen/Documents/Torrent.load
 writeable = yes
; browseable = yes
 guest ok = yes

[Parkwood Library]
 comment = Parkwood Library
 path = /media/Parkwood Library
 writeable = yes
; browseable = yes
 guest ok = yes

[sc101a]
 path = /media/sc101a
 writeable = yes
; browseable = yes
 guest ok = yes

[sc101b]
 path = /media/sc101b
 writeable = yes
; browseable = yes
 guest ok = yes

[PodCasts]
 comment = PodCasts
 path = /media/disk/PodCasts
; writeable = No
; browseable = yes
 guest ok = yes

[Documents]
 path = /media/LACIE/Documents
 writeable = yes
; browseable = yes
 comment = Documents
 guest ok = yes

[Pictures]
 path = /media/LACIE/Pictures
 writeable = yes
; browseable = yes
 guest ok = yes
 comment = Parkwood Photo Library

[Odds & Ends]
 path = /media/LACIE/Odds & Ends
 writeable = yes
; browseable = yes
 guest ok = yes

[Audio Books]
 path = /media/Parkwood Library/Audio Books
 writeable = yes
; browseable = yes
 guest ok = yes

[Music]
 path = /media/Parkwood Library/Music
 writeable = yes
; browseable = yes
 guest ok = yes

[Videos]
 path = /media/Parkwood Library/Videos
 writeable = yes
; browseable = yes
 guest ok = yes