#1272 - nxagent crashes on Ubuntu 16.04, making x2go server unusable

X2Go Bug report logs - #1272
nxagent crashes on Ubuntu 16.04, making x2go server unusable

Reported by: Maciej Puzio <maciej@work.swmed.edu>

Date: Wed, 14 Mar 2018 21:55:02 UTC

Severity: grave

Tags: fixed-upstream

Merged with 1269

Found in version 3.5.99.15

Fixed in version 3.5.99.16

Done: Stefan Baur <X2Go-ML-1@baur-itcs.de>

Bug is archived. No further changes may be made.

Forwarded to https://github.com/ArcticaProject/nx-libs/issues/677

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From: Maciej Puzio <maciej@work.swmed.edu>
To: submit@bugs.x2go.org
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Date: Wed, 14 Mar 2018 16:29:46 -0500
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Subject: nxagent crashes on Ubuntu 16.04, making x2go server unusable

Package: nxagent Version: 3.5.99.15-0~201803072246~ubuntu16.04.1 Severity: grave I originally submitted this post for bug 1269, but as this is a somewhat different issue of greater severity, I am creating a separate bug. Reason for grave severity: bug makes the package in question unusable, as it does the whole x2go server. Short description: Attempt of starting an x2go session causes the session window to briefly appear and then disappear. Server syslog shows a segfault: kernel: [ 3899.187248] nxagent[7306]: segfault at 0 ip 0000558c9d0045fb sp 00007ffdad91c1f0 error 4 in nxagent[558c9cf39000+432000] In my case, a routine system update (apt-get update && apt-get dist-upgrade) rendered a production server unusable, with no easy way to rollback the botched x2go update. The issue did not appear before the update. I recreated the issue on clean install of a vanilla Ubuntu 16.04 server running in a VM. I use this install as a basis for the description below. Versions - server: x2goserver: 4.1.0.0-0~1517~ubuntu16.04.1 (this is the newest server from x2go stable PPA for Ubuntu 16.04) nxagent: 3.5.99.15-0~201803072246~ubuntu16.04.1 uname -r: 4.4.0-116-generic lsb_release -d: Ubuntu 16.04.4 LTS Versions - client: x2goclient: 4.0.5.1-1 (this is the newest client from Ubuntu 16.04 repo) uname -r: 4.13.0-32-generic lsb_release -d: Ubuntu 16.04.3 LTS Steps to reproduce: 1. Install Ubuntu 16.04 server in a VM (from ubuntu-16.04.3-server-amd64.iso downloaded from ubuntu.com). 2. Update the system (apt-get update && apt-get dist-upgrade) and reboot. 3. Install x2go as described on https://wiki.x2go.org/doku.php/wiki:repositories:ubuntu All commands run as root (sudo su -) apt-add-repository ppa:x2go/stable apt-get update apt-get install x2goserver x2goserver-xsession --no-install-recommends 4. Install minimal XFCE desktop: apt-get install xfwm4 xfce4-panel xfce4-settings xfce4-session xfce4-terminal xfdesktop4 xfce4-taskmanager xfce4-appfinder xfce4-artwork --no-install-recommends 5. Attempt to connect with a x2go client from another machine: My x2goclient version: 4.0.5.1-1 Results: Messages on client side ---------------------------- NXPROXY - Version 3.5.0 Copyright (C) 2001, 2011 NoMachine. See http://www.nomachine.com/ for more information. Info: Proxy running in client mode with pid '16432'. Session: Starting session at 'Tue Mar 13 16:10:36 2018'. Info: Connecting to remote host 'localhost:37853'. Info: Connection to remote proxy 'localhost:37853' established. Info: Connection with remote proxy completed. Warning: Unrecognized session type 'unix-kde-depth_24'. Assuming agent session. Info: Using LAN link parameters 1536/24/1/0. Info: Using pack method '16m-jpeg-9' with session 'unix-kde-depth_24'. Info: Not using NX delta compression. Info: Not using ZLIB data compression. Info: Not using ZLIB stream compression. Info: Not using a persistent cache. Info: Forwarding X11 connections to display ':0'. Session: Session started at 'Tue Mar 13 16:10:36 2018'. Info: Established X server connection. Info: Using shared memory parameters 0/0K. Error: Failure reading from the peer proxy. Error: Connection with remote peer broken. Error: Please check the state of your network and retry. Session: Terminating session at 'Tue Mar 13 16:10:37 2018'. Session: Session terminated at 'Tue Mar 13 16:10:37 2018'. Info: Established X server connection. Info: Using shared memory parameters 0/0K. ---------------------------- Server syslog messages (with log level: debug) ---------------------------- Mar 13 16:03:59 nano systemd[1]: Started Session 5 of user testuser. Mar 13 16:03:59 nano x2golistsessions: executing external command ,,x2gopath'' with args: libexec Mar 13 16:03:59 nano x2golistsessions: executing external command ,,x2gopath'' with args: libexec Mar 13 16:03:59 nano x2golistsessions: x2golistsessions has been called with no option Mar 13 16:03:59 nano x2golistsessions: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessions,nano Mar 13 16:03:59 nano /usr/bin/x2gostartagent: x2gostartagent called with options: 1920x1150 lan 16m-jpeg-9 unix-kde-depth_24 us auto 1 D XFCE both Mar 13 16:03:59 nano /usr/lib/x2go/x2gogetrandomport: x2gogetrandomport called with options: Mar 13 16:03:59 nano /usr/lib/x2go/x2gogetrandomport: Full SSH port randomization requested. Mar 13 16:03:59 nano /usr/bin/x2gostartagent: client announced itself as "192.168.1.100" Mar 13 16:03:59 nano /usr/bin/x2gosessionlimit[7186]: x2gosessionlimit has been called Mar 13 16:03:59 nano /usr/bin/x2gosessionlimit[7186]: executing external command ,,x2golistsessions'' with args: --all-servers Mar 13 16:03:59 nano x2golistsessions: executing external command ,,x2gopath'' with args: libexec Mar 13 16:03:59 nano x2golistsessions: executing external command ,,x2gopath'' with args: libexec Mar 13 16:03:59 nano x2golistsessions: x2golistsessions has been called with options: --all-servers Mar 13 16:03:59 nano x2golistsessions: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessions_all Mar 13 16:03:59 nano x2gogetdisplays: executing external command ,,x2gopath'' with args: libexec Mar 13 16:03:59 nano x2gogetdisplays: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: getdisplays,nano Mar 13 16:03:59 nano x2gogetdisplays: db_getdisplays called, server: nano; return value: Mar 13 16:03:59 nano x2gogetports: executing external command ,,x2gopath'' with args: libexec Mar 13 16:03:59 nano x2gogetports: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: getports,nano Mar 13 16:04:00 nano x2gogetports: db_getports called, server: nano; return value: Mar 13 16:04:00 nano /usr/bin/x2gostartagent: initializing new session with ID testuser-50-1520975040_stDXFCE_dp24 Mar 13 16:04:00 nano x2goinsertsession: executing external command ,,x2gopath'' with args: libexec Mar 13 16:04:00 nano x2goinsertsession: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: insertsession,50,nano,testuser-50-1520975040_stDXFCE_dp24 Mar 13 16:04:00 nano x2goinsertsession: db_insertsession called, session ID: testuser-50-1520975040_stDXFCE_dp24, server: nano, session ID: testuser-50-1520975040_stDXFCE_dp24 Mar 13 16:04:00 nano x2gogetports: executing external command ,,x2gopath'' with args: libexec Mar 13 16:04:00 nano x2gogetports: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: getports,nano Mar 13 16:04:00 nano x2gogetports: db_getports called, server: nano; return value: Mar 13 16:04:00 nano x2goinsertport: executing external command ,,x2gopath'' with args: libexec Mar 13 16:04:00 nano x2goinsertport: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: insertport,nano,testuser-50-1520975040_stDXFCE_dp24,49992 Mar 13 16:04:00 nano x2goinsertport: db_insertport called, session ID: testuser-50-1520975040_stDXFCE_dp24, server: nano, SSH port: 49992 Mar 13 16:04:00 nano x2gogetports: executing external command ,,x2gopath'' with args: libexec Mar 13 16:04:00 nano x2gogetports: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: getports,nano Mar 13 16:04:00 nano x2gogetports: db_getports called, server: nano; return value: |49992| Mar 13 16:04:00 nano x2goinsertport: executing external command ,,x2gopath'' with args: libexec Mar 13 16:04:00 nano x2goinsertport: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: insertport,nano,testuser-50-1520975040_stDXFCE_dp24,49993 Mar 13 16:04:00 nano x2goinsertport: db_insertport called, session ID: testuser-50-1520975040_stDXFCE_dp24, server: nano, SSH port: 49993 Mar 13 16:04:00 nano x2gogetports: executing external command ,,x2gopath'' with args: libexec Mar 13 16:04:00 nano x2gogetports: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: getports,nano Mar 13 16:04:00 nano x2gogetports: db_getports called, server: nano; return value: |49992| |49993| Mar 13 16:04:00 nano x2goinsertport: executing external command ,,x2gopath'' with args: libexec Mar 13 16:04:00 nano x2goinsertport: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: insertport,nano,testuser-50-1520975040_stDXFCE_dp24,49994 Mar 13 16:04:01 nano x2goinsertport: db_insertport called, session ID: testuser-50-1520975040_stDXFCE_dp24, server: nano, SSH port: 49994 Mar 13 16:04:01 nano /usr/bin/x2gofeature: x2gofeature called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:01 nano /usr/share/x2go/x2gofeature.d/x2goserver.features: x2goserver.features called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:01 nano /usr/share/x2go/x2gofeature.d/x2goserver-x2goagent.features: x2goserver-x2goagent.features called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:01 nano /usr/share/x2go/x2gofeature.d/x2goserver-xsession.features: x2goserver-xsession.features called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:01 nano /usr/bin/x2gostartagent: started nxagent: NX_TEMP=/tmp x2goagent X2GO_NXAGENT_OPTIONS (' -nolisten tcp') NOLISTOPT ('-nolisten tcp') X2GODPIOPTION_ ('-dpi 96') XDMCPPOPT ('') -SESSION_TYPE ('-D') NOEXITPARAM ('') -auth "XAUTHORITY" ('"/home/testuser/.Xauthority"') agent_geometry ('-geometry 1920x1150') -name "SESSION_WINDOW_TITLE" ('"X2GO-testuser-50-1520975040_stDXFCE_dp24"') "NX_AGENT" ('":50"') 2>"SESSION_LOG" ('"/tmp/.x2go-testuser/C-testuser-50-1520975040_stDXFCE_dp24/session.log"') & Mar 13 16:04:01 nano /usr/bin/x2gostartagent: creating new session: testuser-50-1520975040_stDXFCE_dp24 69296b548dda88e17aa006bccb70a4e5 7306 192.168.1.100 49992 49993 49994 -1 -1 Mar 13 16:04:01 nano x2gocreatesession: executing external command ,,x2gopath'' with args: libexec Mar 13 16:04:01 nano x2gocreatesession: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: createsession,testuser-50-1520975040_stDXFCE_dp24,69296b548dda88e17aa006bccb70a4e5,7306,192.168.1.100,49992,49993,49994,-1,-1 Mar 13 16:04:01 nano x2gocreatesession: db_createsession called, session ID: testuser-50-1520975040_stDXFCE_dp24, cookie: 69296b548dda88e17aa006bccb70a4e5, client: 192.168.1.100, pid: 7306, graphics port: 49992, sound port: 49993, file sharing port: 49994. telekinesis ctrl port: -1, telekinesis data port: -1 Mar 13 16:04:01 nano /usr/bin/x2gostartagent: successfully started X2Go Agent session with ID testuser-50-1520975040_stDXFCE_dp24 Mar 13 16:04:01 nano /usr/bin/x2gofeature: x2gofeature called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:01 nano /usr/share/x2go/x2gofeature.d/x2goserver.features: x2goserver.features called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:01 nano /usr/share/x2go/x2gofeature.d/x2goserver-x2goagent.features: x2goserver-x2goagent.features called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:01 nano /usr/share/x2go/x2gofeature.d/x2goserver-xsession.features: x2goserver-xsession.features called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:01 nano /usr/bin/x2goruncommand: x2goruncommand called with options: 50 7306 testuser-50-1520975040_stDXFCE_dp24 49993 xfce4-session nosnd D Mar 13 16:04:01 nano /usr/bin/x2gofeature: x2gofeature called with options: X2GOAGENT_RANDRXINERAMA Mar 13 16:04:01 nano /usr/share/x2go/x2gofeature.d/x2goserver.features: x2goserver.features called with options: X2GOAGENT_RANDRXINERAMA Mar 13 16:04:01 nano /usr/share/x2go/x2gofeature.d/x2goserver-x2goagent.features: x2goserver-x2goagent.features called with options: X2GOAGENT_RANDRXINERAMA Mar 13 16:04:01 nano /usr/bin/x2gofeature: x2gofeature called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:01 nano /usr/share/x2go/x2gofeature.d/x2goserver.features: x2goserver.features called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:01 nano /usr/share/x2go/x2gofeature.d/x2goserver-x2goagent.features: x2goserver-x2goagent.features called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:01 nano /usr/share/x2go/x2gofeature.d/x2goserver-xsession.features: x2goserver-xsession.features called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:01 nano /usr/bin/x2goruncommand: running command /usr/bin/xfce4-session Mar 13 16:04:01 nano /usr/bin/x2gosetkeyboard: x2gosetkeyboard called with options: Mar 13 16:04:01 nano /usr/bin/x2gofeature: x2gofeature called with options: X2GO_XSESSION Mar 13 16:04:01 nano /usr/bin/x2gosetkeyboard: Setting X keyboard according to /home/testuser/.x2go/C-testuser-50-1520975040_stDXFCE_dp24/keyboard Mar 13 16:04:01 nano /usr/share/x2go/x2gofeature.d/x2goserver.features: x2goserver.features called with options: X2GO_XSESSION Mar 13 16:04:02 nano /usr/share/x2go/x2gofeature.d/x2goserver-x2goagent.features: x2goserver-x2goagent.features called with options: X2GO_XSESSION Mar 13 16:04:02 nano /usr/share/x2go/x2gofeature.d/x2goserver-xsession.features: x2goserver-xsession.features called with options: X2GO_XSESSION Mar 13 16:04:02 nano /usr/bin/x2goruncommand: launching session with Xsession-x2go mechanism, using STARTUP="xfce4-session" Mar 13 16:04:02 nano /usr/bin/x2goruncommand: dbus wrapper available as /usr/bin/dbus-run-session Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/20x11-common_process-args Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/30x11-common_xresources Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/35x11-common_xhost-local Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/40x11-common_xsessionrc Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/50x11-common_determine-startup Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/55xfce4-session Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/60x11-common_localhost Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/60x11-common_xdg_path Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/60xdg-user-dirs-update Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/65snappy Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/75dbus_dbus-launch Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/90x11-common_ssh-agent Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/95dbus_update-activation-env Mar 13 16:04:02 nano /etc/x2go/Xsession: executing /etc/x2go/Xsession.d/99x11-common_start Mar 13 16:04:02 nano kernel: [ 3899.187248] nxagent[7306]: segfault at 0 ip 0000558c9d0045fb sp 00007ffdad91c1f0 error 4 in nxagent[558c9cf39000+432000] Mar 13 16:04:02 nano /usr/bin/x2goruncommand: command /usr/bin/xfce4-session has finished Mar 13 16:04:02 nano /usr/bin/x2gofeature: x2gofeature called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:02 nano /usr/bin/x2gocmdexitmessage: x2gocmdexitmessage called with options: testuser-50-1520975040_stDXFCE_dp24 Mar 13 16:04:02 nano /usr/share/x2go/x2gofeature.d/x2goserver.features: x2goserver.features called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:02 nano /usr/bin/x2gocmdexitmessage: command output starts with: exec xfce4-session Loading profile from /etc/profile Loading profile from /home/testuser/.profile Activating service name='org.freedesktop.systemd1' Activated service 'org.freedesktop.systemd1' failed: Process org.freedesktop.systemd1 exited with status 1 Mar 13 16:04:02 nano /usr/share/x2go/x2gofeature.d/x2goserver-x2goagent.features: x2goserver-x2goagent.features called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:03 nano /usr/share/x2go/x2gofeature.d/x2goserver-xsession.features: x2goserver-xsession.features called with options: X2GO_RUN_EXTENSIONS Mar 13 16:04:03 nano /usr/bin/x2gofeature: x2gofeature called with options: X2GO_DESKTOPSHARING Mar 13 16:04:03 nano /usr/share/x2go/x2gofeature.d/x2goserver.features: x2goserver.features called with options: X2GO_DESKTOPSHARING Mar 13 16:04:03 nano /usr/share/x2go/x2gofeature.d/x2goserver-x2goagent.features: x2goserver-x2goagent.features called with options: X2GO_DESKTOPSHARING Mar 13 16:04:03 nano /usr/share/x2go/x2gofeature.d/x2goserver-xsession.features: x2goserver-xsession.features called with options: X2GO_DESKTOPSHARING Mar 13 16:04:03 nano x2gochangestatus: executing external command ,,x2gopath'' with args: libexec Mar 13 16:04:03 nano x2gochangestatus: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: changestatus,F,testuser-50-1520975040_stDXFCE_dp24 Mar 13 16:04:03 nano x2gochangestatus: db_changestatus called, session ID: testuser-50-1520975040_stDXFCE_dp24, new status: F Mar 13 16:04:03 nano x2goumount-session: executing external command ,,x2gopath'' with args: libexec Mar 13 16:04:03 nano x2goumount-session: x2goumount-session has been called with options: testuser-50-1520975040_stDXFCE_dp24 Mar 13 16:04:03 nano x2goumount-session: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: getdisplay,testuser-50-1520975040_stDXFCE_dp24 Mar 13 16:04:03 nano x2goumount-session: db_getdisplay called, session ID: testuser-50-1520975040_stDXFCE_dp24; return value: 50 Mar 13 16:04:03 nano x2goumount-session: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: getmounts,testuser-50-1520975040_stDXFCE_dp24 Mar 13 16:04:03 nano x2goumount-session: db_getmounts called, session ID: testuser-50-1520975040_stDXFCE_dp24; return value: ---------------------------- [my bug# 298]

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X2Go Bug report logs - #1272 nxagent crashes on Ubuntu 16.04, making x2go server unusable

X2Go Bug report logs - #1272
nxagent crashes on Ubuntu 16.04, making x2go server unusable