[FreeNX-kNX] Segfault when shadowing session

[Stepan Potocky]

  Hello,
I would like to ask you about help. I have Ubuntu 8.04 (32 bit) with
FreeNX server (0.7.3+svn612) with NXSERVER - Version 3.2.0-74-SVN OS
(GPL, using backend: 3.3.0). On a client side is MS Windows XP and
Nomachine's client (3.3.0-3). I am using gdm, Gnome without compiz.

It works fine with Unix desktop and Gnome. Unfortunately when I try to
Shadow desktop it doesn't work. Window with available sessions is
opened where I select my current session (on the server) and I hit
attach. After establishing connection and opening session window it is
closed and error message is written "The remote connection with the
remote server was shut down. Please check the state of your network
connection."
According to the log it is due to segmentation fault.

Can you help me and tell me what could be wrong or how to avoid it?


In node.conf file I only changed:
  ENABLE_SESSION_SHADOWING_AUTHORIZATION=0
  SESSION_LOG_CLEAN=0
and I enabled logging.

In my kern.log I found this:
Jan  7 17:32:40 solea kernel: [20169.045834] nxagent[13747]: segfault
at 0000002c eip 080e10d2 esp bf980540 error 6

This is part of nxserver.log:
NX> 148 Server capacity: not reached for user: .*
NX> 105 attachsession  --link="isdn" --backingstore="1"
--encryption="1" --cache="16M" --images="64M" --shmem="1" --shpix="1"
--strict="0" --composite="1" --media="0" --session="test"
--type="shadow" --client="winnt" --keyboard="pc102/en_US"
--id="B638F1811D647B41AEDFD0A959276161" --display="0"

Info: Using /etc/nxserver/nxacl to change session parameters or deny session.
[...]
NX> 1000 NXNODE - Version 3.2.0-74-SVN OS (GPL, using backend: 3.3.0)
NX> 700 Session id: solea-1002-3B0D9CF92F43AB9FA3F75B40E4559FA7
NX> 705 Session display: 1002
NX> 703 Session type: shadow
NX> 701 Proxy cookie: fff5c59b7fdb7bed1bf6cd4c2a8d3996
NX> 702 Proxy IP: 127.0.1.1
NX> 706 Agent cookie: fff5c59b7fdb7bed1bf6cd4c2a8d3996
NX> 704 Session cache: shadow
NX> 707 SSL tunneling: 1
NX> 1009 Session status: starting
NX> 710 Session status: running
NX> 1002 Commit
NX> 1006 Session status: running
NX> 105 bye
Bye
NX> 999 Bye
Info: Closing connection to slave with pid 12858.
NX> 1004 Error: NX Agent exited with exit status 1. To troubleshoot
set SESSION_LOG_CLEAN=0 in node.conf and investigate
"/home/pto/.nx/F-C-solea-1002-3B0D9CF92F43AB9FA3F75B40E4559FA7/session".
You might also want to try: ssh -X myserver; /usr/lib/nx/nxnode
--agent to test the basic functionality. Session log follows:
/usr/lib/nx/nxnode: line 569: 13747 Segmentation fault      (core
dumped) PATH="$PATH_BIN:$PATH" $COMMAND_NXAGENT $R -name "NX -
$user@$SERVER_NAME:$display - $session (GPL Edition)" -option
"$USER_FAKE_HOME/.nx/C-$sess_id/options" $B $FP $AGENT_EXTRA_OPTIONS_X
:$display 2>&3
NX> 1006 Session status: closed
[...]

And this is last few lines from
/home/pto/.nx/F-C-solea-1002-3B0D9CF92F43AB9FA3F75B40E4559FA7/session
file:
[...]
nxagentKeyboardProc: Using XKB extension.
nxagentXkbGetRules: XkbBaseDirectory [/usr/share/X11/xkb].
nxagentKeyboardProc: Using keyboard model [pc102] with layout [en_US].
nxagentKeyboardProc: XkbInitialMap [NULL]
nxagentKeyboardProc: Init XKB extension.
nxagentKeyboardProc: No current keyboard.
nxagentKeyboardProc: No keyboard, going to set rules and init device.
nxagentChangeKeyboardControl: Repeat delay was [65535] interval was [65535].
nxagentChangeKeyboardControl: Repeat delay is now [65535] interval is
now [65535].
nxagentChangeKeyboardControl: WARNING! Propagating changes to keyboard settings.
nxagentKeyboardProc: Called for [DEVICE_ON].
Warning: Parent process appears to be dead. Exiting keeper.

             Thank you very much
             Best regards
                   Stepan