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Qt 5.8 GUI Application on vncviewer results in segmentation fault



  • I'm trying to run a Qt 5.8 GUI application in vncviewer and I'm getting a segmentation fault.

    System Configuration

    Qt 5.8

    Ubuntu 17.04

    vncserver

    Xvnc Free Edition 4.1.1 - built Feb 25 2015 23:02:21

    vncviewer

    TigerVNC Viewer 64-bit v1.7.0

    VNC xstartup script contents:

    #!/bin/sh
    
    export XKL_XMODMAP_DISABLE=1
    unset SESSION_MANAGER
    unset DBUS_SESSION_BUS_ADDRESS
    
    xfce4-panel &
    xfsettingsd &
    xfwm4 &
    xfdesktop &
    pcmanfm &
    xfce4-terminal &
    

    Error Message:

    $ ./MyApp 
    QXcbConnection: Failed to initialize XRandr
    Segmentation fault (core dumped)
    

    Core Dump
    Note: Had to change some paths, app names, and omissions for brevity.

    (gdb) run
    Starting program: $HOME/MyApp 
    [Thread debugging using libthread_db enabled]
    Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
    [New Thread 0x7fffe2023700 (LWP 5917)]
    QXcbConnection: Failed to initialize XRandr
    [New Thread 0x7fffd5cbc700 (LWP 5918)]
    ...
    [omitted for brevity]
    ...
    [New Thread 0x7fff6b32a700 (LWP 5945)]
    
    Thread 23 "Chrome_InProcGp" received signal SIGSEGV, Segmentation fault.
    [Switching to Thread 0x7fff8d7fa700 (LWP 5942)]
    0x00007ffff081abba in ?? () from /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    
    (gdb) bt
    #0  0x00007ffff081abba in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #1  0x00007ffff081b4bc in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #2  0x00007ffff1a51d54 in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #3  0x00007ffff1a54478 in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #4  0x00007ffff1a55589 in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #5  0x00007ffff1a4ffd0 in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #6  0x00007ffff1a5024e in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #7  0x00007ffff1a50969 in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #8  0x00007ffff1a51225 in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #9  0x00007ffff1a512f3 in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #10 0x00007ffff19f725d in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #11 0x00007ffff19a5dbe in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #12 0x00007ffff19a694d in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #13 0x00007ffff19a6c1b in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #14 0x00007ffff19a8559 in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #15 0x00007ffff19bb18a in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #16 0x00007ffff19d0c05 in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #17 0x00007ffff19d0de7 in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #18 0x00007ffff19cd76d in  () at /opt/Qt5.8.0/5.8/gcc_64/lib/libQt5WebEngineCore.so.5
    #19 0x00007ffff7bc06da in start_thread (arg=0x7fff8d7fa700) at pthread_create.c:456
    #20 0x00007fffef6aad7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105
    

    This only happens in vncviewer of remote desktop. On the local system it runs as expected.

    Please let me know if there are any workarounds.


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