Package: x2goagent Version: 3.5.0.32
A segmentation fault makes impossible to connect two machines in Local Area Network. No firewalls of port limitations are in effect, and SSH works normally as per the default Ubuntu installation (packages "openssh-server" and "openssh-client"). While connecting, the server side consistently aborts with a segmentation fault. This happens when the client side selects the Display mode "Custom" or "Use whole display", however the connection stablishes correctly when the mode "Fullscreen" is chosen (although in this mode the whole server screen is stretched and it is almost impossible to see anything, see server & client configurations). Please, if there is any other document I should include, don't hesitate to ask for it. Note that the systems start from a clean state, so the Server and Client configurations for X2Go are as per the default values.
-------- Description of both systems --------
Server machine: * Ubuntu 14.04 server with minimal install of Xorg and Xfce * Kernel version 3.16.0-49, from package "linux-image-generic-lts-utopic" * X.Org X Server version 1.16.0, from package "xserver-xorg-lts-utopic" (1:7.7+7ubuntu2~trusty1) * Xfce 4.10.1 * The server has 6 screens configured with Xinerama, with a virtual desktop of 5760x5120. Below is included the output from "xrandr".
Client machine: * Linux Mint 17.2 KDE * Kernel version 3.16.0-49 * X.Org X Server version 1.15.1 from package "xserver-xorg" (1:7.7+1ubuntu8.1) * KDE 4.14.2 * This is a workstation desktop with 2 1920x1080 screens.
Server setup (from a clean state): # add-apt-repository ppa:x2go/stable # aptitude update # aptitude install x2goserver x2godesktopsharing sshfs x11-apps x11-session-utils x11-xfs-utils x2goserver-extensions x2goserver-xsession xbitmaps # adduser juan x2gouser # adduser juan x2godesktopsharing # sync ; shutdown -r now $ export DISPLAY=:0 ; x2godesktopsharing --activate-desktop-sharing
Client setup (from a clean state): # add-apt-repository ppa:x2go/stable # aptitude update # aptitude install x2goclient $ x2goclient --debug Session Host: <Server IP> Login: juan SSH port: 22 Session type: "Connect to local desktop" Settings Display: Custom (800x600) Set display DPI: 96 Xinerama extension: No Enable sound support: No Client side printing support: No
-------- Server xrandr output --------
$ xrandr Screen 0: minimum 320 x 200, current 5760 x 5120, maximum 16384 x 16384 DFP1 connected 1920x1080+0+2960 (normal left inverted right x axis y axis) 531mm x 299mm 1920x1080 60.0*+ 1680x1050 60.0 1400x1050 60.0 1600x900 60.0 1280x1024 60.0 1440x900 60.0 1280x960 60.0 1280x800 60.0 1152x864 60.0 1280x768 60.0 1280x720 60.0 1024x768 60.0 800x600 60.0 640x480 60.0 DFP2 disconnected (normal left inverted right x axis y axis) DFP3 disconnected (normal left inverted right x axis y axis) DFP4 disconnected (normal left inverted right x axis y axis) DFP5 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm 1920x1080 60.0*+ 1680x1050 60.0 1400x1050 60.0 1600x900 60.0 1280x1024 60.0 1440x900 60.0 1280x960 60.0 1280x800 60.0 1152x864 60.0 1280x768 60.0 1280x720 60.0 1024x768 60.0 800x600 60.0 640x480 60.0 DFP6 disconnected (normal left inverted right x axis y axis) DFP7 disconnected (normal left inverted right x axis y axis) DFP8 disconnected (normal left inverted right x axis y axis) DFP9 connected 3840x2160+1920+0 (normal left inverted right x axis y axis) 0mm x 0mm 3840x2160 30.0*+ 2560x1440 30.0 2048x1536 30.0 1800x1440 30.0 1856x1392 30.0 1792x1344 30.0 1920x1200 30.0 1920x1080 30.0 1600x1200 30.0 1680x1050 30.0 1400x1050 30.0 1600x900 30.0 1280x1024 30.0 1440x900 30.0 1280x960 30.0 1280x768 30.0 1280x720 30.0 1024x768 30.0 800x600 30.0 640x480 30.0 DFP10 disconnected (normal left inverted right x axis y axis) DFP11 disconnected (normal left inverted right x axis y axis) DFP12 disconnected (normal left inverted right x axis y axis) DFP13 connected 1920x1080+1920+2960 (normal left inverted right x axis y axis) 531mm x 299mm 1920x1080 60.0*+ 1680x1050 60.0 1400x1050 60.0 1600x900 60.0 1280x1024 60.0 1440x900 60.0 1280x960 60.0 1280x800 60.0 1152x864 60.0 1280x768 60.0 1280x720 60.0 1024x768 60.0 800x600 60.0 640x480 60.0 DFP14 disconnected (normal left inverted right x axis y axis) DFP15 disconnected (normal left inverted right x axis y axis) DFP16 disconnected (normal left inverted right x axis y axis) DFP17 connected 1920x1080+0+4040 (normal left inverted right x axis y axis) 531mm x 299mm 1920x1080 60.0*+ 1680x1050 60.0 1400x1050 60.0 1600x900 60.0 1280x1024 60.0 1440x900 60.0 1280x960 60.0 1280x800 60.0 1152x864 60.0 1280x768 60.0 1280x720 60.0 1024x768 60.0 800x600 60.0 640x480 60.0 DFP18 disconnected (normal left inverted right x axis y axis) DFP19 disconnected (normal left inverted right x axis y axis) DFP20 disconnected (normal left inverted right x axis y axis) DFP21 connected 1920x1080+1920+4040 (normal left inverted right x axis y axis) 531mm x 299mm 1920x1080 60.0*+ 1680x1050 60.0 1400x1050 60.0 1600x900 60.0 1280x1024 60.0 1440x900 60.0 1280x960 60.0 1280x800 60.0 1152x864 60.0 1280x768 60.0 1280x720 60.0 1024x768 60.0 800x600 60.0 640x480 60.0 DFP22 disconnected (normal left inverted right x axis y axis) DFP23 disconnected (normal left inverted right x axis y axis) DFP24 disconnected (normal left inverted right x axis y axis)
-------- Server log output --------
$ tail -f /var/log/syslog | grep -i x2go /usr/bin/x2golistdesktops[16853]: x2golistdesktops has been called without options /usr/bin/x2golistsessions[16863]: x2golistsessions has been called with options: x2goserver /usr/bin/x2gostartagent: x2gostartagent called with options: 800x600 adsl 16m-jpeg-9 unix-kde-depth_24 us pc105/us 0 S 1XSHADjuanXSHAD:0 /usr/bin/x2gostartagent: client announced itself as ,,172.16.0.146'' /usr/bin/x2gostartagent: shadow session requested: mode 1, user: juan, desktop: :0 /usr/bin/x2gosessionlimit[17006]: x2gosessionlimit has been called /usr/bin/x2golistsessions[17009]: x2golistsessions has been called with options: --all-servers /usr/lib/x2go/x2gogetdisplays[17026]: db_getdisplays called, server: MYHOST; return value: /usr/lib/x2go/x2gogetports[17035]: db_getports called, server: MYHOST; return value: /usr/lib/x2go/x2goinsertsession[17058]: db_insertsession called, session ID: juan-50-1442489867_stS1XSHADjuanXSHADPP0_dp24, server: MYHOST, session ID: juan-50-1442489867_stS1XSHADjuanXSHADPP0_dp24 /usr/lib/x2go/x2gogetports[17088]: db_getports called, server: MYHOST; return value: /usr/sbin/x2gocleansessions[1153]: juan-50-1442489867_stS1XSHADjuanXSHADPP0_dp24: state file for this session does not exist: /tmp/.x2go-juan/C-juan-50-1442489867_stS1XSHADjuanXSHADPP0_dp24/state (this can be ignored during session startups) /usr/lib/x2go/x2goinsertport[17111]: db_insertport called, session ID: juan-50-1442489867_stS1XSHADjuanXSHADPP0_dp24, server: MYHOST, SSH port: 30001 /usr/lib/x2go/x2gogetports[17120]: db_getports called, server: MYHOST; return value: |30001| /usr/lib/x2go/x2goinsertport[17134]: db_insertport called, session ID: juan-50-1442489867_stS1XSHADjuanXSHADPP0_dp24, server: MYHOST, SSH port: 30002 /usr/lib/x2go/x2gogetports[17164]: db_getports called, server: MYHOST; return value: |30001| |30002| /usr/lib/x2go/x2goinsertport[17178]: db_insertport called, session ID: juan-50-1442489867_stS1XSHADjuanXSHADPP0_dp24, server: MYHOST, SSH port: 30003 /usr/bin/x2gostartagent: user ,,juan'' grants access to /tmp/.x2go-juan/C-juan-50-1442489867_stS1XSHADjuanXSHADPP0_dp24 for group ,,x2godesktopsharing'' /usr/bin/x2gofeature: x2gofeature called with options: X2GO_RUN_EXTENSIONS /usr/share/x2go/x2gofeature.d/x2godesktopsharing.features: x2godesktopsharing.features called with options: X2GO_RUN_EXTENSIONS /usr/share/x2go/x2gofeature.d/x2goserver-extensions.features: x2goserver-extensions.features called with options: X2GO_RUN_EXTENSIONS /usr/bin/x2goserver-run-extensions: x2goserver-run-extensions called with options: juan-50-1442489867_stS1XSHADjuanXSHADPP0_dp24 pre-start /usr/bin/x2gostartagent: successfully started X2Go agent session with ID juan-50-1442489867_stS1XSHADjuanXSHADPP0_dp24 /usr/bin/x2gofeature: x2gofeature called with options: X2GO_RUN_EXTENSIONS /usr/share/x2go/x2gofeature.d/x2godesktopsharing.features: x2godesktopsharing.features called with options: X2GO_RUN_EXTENSIONS /usr/share/x2go/x2gofeature.d/x2goserver-extensions.features: x2goserver-extensions.features called with options: X2GO_RUN_EXTENSIONS /usr/bin/x2goserver-run-extensions: x2goserver-run-extensions called with options: juan-50-1442489867_stS1XSHADjuanXSHADPP0_dp24 post-start /usr/lib/x2go/x2gocreatesession[17321]: db_createsession called, session ID: juan-50-1442489867_stS1XSHADjuanXSHADPP0_dp24, cookie: a7c2e20a3046d67e613fcffb9953279e, client: 172.16.0.146, pid: 17243, graphics port: 30001, sound port: 30002, file sharing port: 30003 /usr/bin/x2gostartagent: blocking creation of agent's keyboard file /tmp/.x2go-juan/C-juan-50-1442489867_stS1XSHADjuanXSHADPP0_dp24/keyboard as requested by session startup command kernel: [ 591.423830] x2goagent[17243]: segfault at 0 ip (null) sp 00007ffd23048e58 error 14 in nxagent[400000+555000]
-------- Client log output --------
$ x2goclient --debug x2go-INFO-1> "Starting X2Go Client..." x2go-WARNING-1> "English language requested, not loading translator." x2go-WARNING-1> "English language requested, not loading translator." Bus::open: Can not get ibus-daemon's address. IBusInputContext::createInputContext: no connection to ibus-daemon x2go-INFO-3> "Started X2Go Client." x2go-DEBUG-../src/onmainwindow.cpp:496> "$HOME=/home/juan" x2go-DEBUG-../src/onmainwindow.cpp:2179> Reading 1 sessions from config file. x2go-DEBUG-../src/sessionbutton.cpp:319> Creating QPixmap with session icon: ":/img/icons/128x128/x2gosession.png". x2go-DEBUG-../src/onmainwindow.cpp:2657> Creating QPixmap with session icon: '":/img/icons/128x128/x2gosession.png"'. x2go-INFO-8> "Starting connection to server: 172.16.0.143:22" x2go-DEBUG-../src/onmainwindow.cpp:2758> Starting new ssh connection to server:"172.16.0.143":"22" krbLogin: false x2go-DEBUG-../src/sshmasterconnection.cpp:168> SshMasterConnection, host "172.16.0.143"port 22user "juan"useproxy falseproxyserver ""proxyport 22 x2go-DEBUG-../src/sshmasterconnection.cpp:205> Starting SSH connection without Kerberos authentication. x2go-DEBUG-../src/sshmasterconnection.cpp:209> SshMasterConnection, instance SshMasterConnection(0x2524800) created. x2go-DEBUG-../src/sshmasterconnection.cpp:445> SshMasterConnection, instance SshMasterConnection(0x2524800) entering thread. x2go-DEBUG-../src/sshmasterconnection.cpp:481> libssh not initialized yet. Initializing. x2go-DEBUG-../src/sshmasterconnection.cpp:792> cserverAuth x2go-DEBUG-../src/sshmasterconnection.cpp:807> state: 1
x2go-DEBUG-../src/sshmasterconnection.cpp:966> Password authentication requested.
x2go-DEBUG-../src/sshmasterconnection.cpp:657> User authentication OK. x2go-DEBUG-../src/onmainwindow.cpp:2853> SSH connection established. x2go-DEBUG-../src/onmainwindow.cpp:3120> Continue normal X2Go session x2go-DEBUG-../src/sshprocess.cpp:199> Executing remote command via SshProcess object 0: "export HOSTNAME && x2golistdesktops" x2go-DEBUG-../src/sshprocess.cpp:204> Running masterCon->addChannelConnection(this, '"29152f86-e05f-4030-a84f-838b8eaa8953"', '"bash -c 'echo "X2GODATABEGIN:29152f86-e05f-4030-a84f-838b8eaa8953"; export PATH="/usr/local/bin:/usr/bin:/bin"; export HOSTNAME && x2golistdesktops; echo "X2GODATAEND:29152f86-e05f-4030-a84f-838b8eaa8"'); x2go-DEBUG-../src/sshmasterconnection.cpp:1284> Locking SSH channel connection MUTEX. x2go-DEBUG-../src/sshmasterconnection.cpp:1286> Passing new channel conenction object to channelConnections. x2go-DEBUG-../src/sshmasterconnection.cpp:1288> Unlocking SSH channel connection MUTEX. x2go-DEBUG-../src/sshmasterconnection.cpp:1476> Creating new channel.
x2go-DEBUG-../src/sshmasterconnection.cpp:1480> New channel:0x7f5f98012850
x2go-DEBUG-../src/sshmasterconnection.cpp:1511> Executing remote: "bash -c 'echo "X2GODATABEGIN:29152f86-e05f-4030-a84f-838b8eaa8953"; export PATH="/usr/local/bin:/usr/bin:/bin"; export HOSTNAME && x2golistdesktops; echo "X2GODATAEND:29152f86-e05f-4030-a84f-838b8eaa8953";'"
x2go-DEBUG-../src/sshmasterconnection.cpp:1534> New exec channel created.
x2go-DEBUG-../src/sshmasterconnection.cpp:1638> EOF on channel 0x7f5f98012850; SshProcess object: 0 x2go-DEBUG-../src/sshmasterconnection.cpp:1706> EOF sent. x2go-DEBUG-../src/sshmasterconnection.cpp:1710> Channel closed. x2go-DEBUG-../src/sshprocess.cpp:517> SSH finished: raw output (stdout): "X2GODATABEGIN:29152f86-e05f-4030-a84f-838b8eaa8953 juan@:0 X2GODATAEND:29152f86-e05f-4030-a84f-838b8eaa8953 " x2go-DEBUG-../src/sshprocess.cpp:528> SSH finished: true - "juan@:0 " (0). x2go-DEBUG-../src/onmainwindow.cpp:3458> "juan@:0 " x2go-DEBUG-../src/onmainwindow.cpp:3984> Executing remote command: "X2GODPI=96 x2gostartagent 800x600 adsl 16m-jpeg-9 unix-kde-depth_24 us pc105/us 0 S 1XSHADjuanXSHAD:0" x2go-DEBUG-../src/sshprocess.cpp:199> Executing remote command via SshProcess object 1: "X2GODPI=96 x2gostartagent 800x600 adsl 16m-jpeg-9 unix-kde-depth_24 us pc105/us 0 S 1XSHADjuanXSHAD:0" x2go-DEBUG-../src/sshprocess.cpp:204> Running masterCon->addChannelConnection(this, '"c7117732-1c6d-480b-a38c-a7d4b931978f"', '"bash -c 'echo "X2GODATABEGIN:c7117732-1c6d-480b-a38c-a7d4b931978f"; export PATH="/usr/local/bin:/usr/bin:/bin"; X2GODPI=96 x2gostartagent 800x600 adsl 16m-jpeg-9 unix-kde-depth_24 us pc105/us 0 S 1XSH"'); x2go-DEBUG-../src/sshmasterconnection.cpp:1284> Locking SSH channel connection MUTEX. x2go-DEBUG-../src/sshmasterconnection.cpp:1286> Passing new channel conenction object to channelConnections. x2go-DEBUG-../src/sshmasterconnection.cpp:1288> Unlocking SSH channel connection MUTEX. x2go-DEBUG-../src/sshmasterconnection.cpp:1476> Creating new channel.
x2go-DEBUG-../src/sshmasterconnection.cpp:1480> New channel:0x7f5f98012850
x2go-DEBUG-../src/sshmasterconnection.cpp:1511> Executing remote: "bash -c 'echo "X2GODATABEGIN:c7117732-1c6d-480b-a38c-a7d4b931978f"; export PATH="/usr/local/bin:/usr/bin:/bin"; X2GODPI=96 x2gostartagent 800x600 adsl 16m-jpeg-9 unix-kde-depth_24 us pc105/us 0 S 1XSHADjuanXSHAD:0; echo "X2GODATAEND:c7117732-1c6d-480b-a38c-a7d4b931978f";'"
x2go-DEBUG-../src/sshmasterconnection.cpp:1534> New exec channel created.
x2go-DEBUG-../src/sshmasterconnection.cpp:1583> EOF on channel 0x7f5f98012850; SshProcess object: 1 x2go-DEBUG-../src/sshmasterconnection.cpp:1706> EOF sent. x2go-DEBUG-../src/sshmasterconnection.cpp:1710> Channel closed. x2go-DEBUG-../src/sshprocess.cpp:517> SSH finished: raw output (stdout): "X2GODATABEGIN:c7117732-1c6d-480b-a38c-a7d4b931978f 50 0f9c5949089bcd60268bf68aeddf1142 11536 juan-50-1442492330_stS1XSHADjuanXSHADPP0_dp24 30001 30002 30003 X2GODATAEND:c7117732-1c6d-480b-a38c-a7d4b931978f " x2go-DEBUG-../src/sshprocess.cpp:528> SSH finished: true - "50 0f9c5949089bcd60268bf68aeddf1142 11536 juan-50-1442492330_stS1XSHADjuanXSHADPP0_dp24 30001 30002 30003 " (1). x2go-DEBUG-../src/onmainwindow.cpp:4790> Agent output: "50 0f9c5949089bcd60268bf68aeddf1142 11536 juan-50-1442492330_stS1XSHADjuanXSHADPP0_dp24 30001 30002 30003 " x2go-DEBUG-../src/sshprocess.cpp:372> Starting tunnel via SshProcess object 2: "localhost":30001 -> "localhost":31001
x2go-DEBUG-../src/onmainwindow.cpp:5400> "Starting NX proxy, command: nxproxy -S nx/nx,options=/home/juan/.x2go/S-juan-50-1442492330_stS1XSHADjuanXSHADPP0_dp24/options:50" x2go-DEBUG-../src/sshprocess.cpp:157> Direct tunnel: waiting for connections on "localhost":31001 x2go-DEBUG-../src/onmainwindow.cpp:5734> Proxy wrote on stderr: " NXPROXY - Version 3.5.0
Copyright (C) 2001, 2010 NoMachine. See http://www.nomachine.com/ for more information.
Info: Proxy running in client mode with pid '3307'. Session: Starting session at 'Thu Sep 17 14:18:52 2015'. Info: Using abstract X11 socket in kernel namespace for accessing DISPLAY=:0. Info: Connecting to remote host 'localhost:31001'. Info: Connection to remote proxy 'localhost:31001' established. " x2go-DEBUG-../src/sshprocess.cpp:109> New TCP connection. x2go-DEBUG-../src/sshprocess.cpp:114> New socket: 15 x2go-DEBUG-../src/sshmasterconnection.cpp:1476> Creating new channel.
x2go-DEBUG-../src/sshmasterconnection.cpp:1480> New channel:0x7f5f98011070
x2go-DEBUG-../src/sshmasterconnection.cpp:1486> Forwarding new channel, local port: 55067
x2go-DEBUG-../src/sshmasterconnection.cpp:1504> New channel forwarded.
x2go-DEBUG-../src/onmainwindow.cpp:5734> Proxy wrote on stderr: "Info: Connection with remote proxy completed. " x2go-DEBUG-../src/onmainwindow.cpp:5734> Proxy wrote on stderr: "Warning: Unrecognized session type 'unix-kde-depth_24'. Assuming agent session. " x2go-DEBUG-../src/onmainwindow.cpp:5734> Proxy wrote on stderr: "Info: Using ADSL link parameters 512/24/1/0. Info: Using cache parameters 4/4096KB/8192KB/8192KB. Info: Using pack method '16m-jpeg-9' with session 'unix-kde-depth_24'. Info: Using ZLIB data compression 1/1/32. Info: Using ZLIB stream compression 4/4. Info: No suitable cache file found. Info: Forwarding X11 connections to display ':0'. " x2go-DEBUG-../src/onmainwindow.cpp:5734> Proxy wrote on stderr: "Session: Session started at 'Thu Sep 17 14:18:52 2015'. Info: Established X server connection. " x2go-DEBUG-../src/onmainwindow.cpp:5734> Proxy wrote on stderr: "Info: Using shared memory parameters 0/0K. " x2go-DEBUG-../src/sshmasterconnection.cpp:1583> EOF on channel 0x7f5f98011070; SshProcess object: 2 x2go-DEBUG-../src/sshmasterconnection.cpp:1706> EOF sent. x2go-DEBUG-../src/sshmasterconnection.cpp:1710> Channel closed. x2go-DEBUG-../src/onmainwindow.cpp:5734> Proxy wrote on stderr: "Error: Failure reading from the peer proxy. Error: Connection with remote peer broken. " x2go-DEBUG-../src/onmainwindow.cpp:5734> Proxy wrote on stderr: "Error: Please check the state of your network and retry. Session: Terminating session at 'Thu Sep 17 14:18:53 2015'. Session: Session terminated at 'Thu Sep 17 14:18:53 2015'. " x2go-DEBUG-../src/onmainwindow.cpp:5591> Deleting Proxy. x2go-DEBUG-../src/onmainwindow.cpp:5640> Waiting for proxy to exit. x2go-DEBUG-../src/onmainwindow.cpp:5665> Deleting SSH connection instance. x2go-DEBUG-../src/sshmasterconnection.cpp:711> SshMasterConnection, instance SshMasterConnection(0x2524800) waiting for thread to finish. x2go-DEBUG-../src/sshmasterconnection.cpp:1395> Disconnecting ...
x2go-DEBUG-../src/sshmasterconnection.cpp:1406> Deleting channel connections.
x2go-DEBUG-../src/sshmasterconnection.cpp:1414> Disconnecting session.
x2go-DEBUG-../src/sshmasterconnection.cpp:1420> Deleting sockets.
x2go-DEBUG-../src/sshmasterconnection.cpp:1427> All channels closed and session disconnected. Quiting session loop.
x2go-DEBUG-../src/sshmasterconnection.cpp:715> SshMasterConnection, instance SshMasterConnection(0x2524800) thread finished. x2go-DEBUG-../src/sshprocess.cpp:52> SshProcess destructor called. x2go-DEBUG-../src/sshprocess.cpp:52> SshProcess destructor called. x2go-DEBUG-../src/sshprocess.cpp:52> SshProcess destructor called. x2go-DEBUG-../src/sshmasterconnection.cpp:722> SshMasterConnection, instance SshMasterConnection(0x2524800) finished destructor. x2go-DEBUG-../src/onmainwindow.cpp:5667> Deleted SSH connection instance. x2go-DEBUG-../src/onmainwindow.cpp:5717> Finished proxy.