Thanks Felix, sorry, apport didn't pop up. I backtraced it using gdb, in case it is not enough, please tell me how I can help. GNU gdb (GDB) 7.2-ubuntu Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". For bug reporting instructions, please see: ... Reading symbols from /usr/lib/virtualbox/VirtualBox...(no debugging symbols found)...done. (gdb) attach 1033 Attaching to program: /usr/lib/virtualbox/VirtualBox, process 1033 Reading symbols from /lib/libpthread.so.0...(no debugging symbols found)...done. [Thread debugging using libthread_db enabled] [New Thread 0x7f818b6c7700 (LWP 1111)] [New Thread 0x7f8174a9a700 (LWP 1063)] [New Thread 0x7f817529b700 (LWP 1062)] [New Thread 0x7f818c690700 (LWP 1061)] [New Thread 0x7f817eb96700 (LWP 1060)] [New Thread 0x7f817ec17700 (LWP 1059)] [New Thread 0x7f817ecd8700 (LWP 1058)] [New Thread 0x7f817ed09700 (LWP 1057)] [New Thread 0x7f8182fe8700 (LWP 1055)] [New Thread 0x7f818831f700 (LWP 1054)] [New Thread 0x7f8189d80700 (LWP 1053)] [New Thread 0x7f818a009700 (LWP 1050)] [New Thread 0x7f818af70700 (LWP 1049)] [New Thread 0x7f818b1fb700 (LWP 1048)] [New Thread 0x7f818b3c5700 (LWP 1047)] [New Thread 0x7f818b646700 (LWP 1046)] [New Thread 0x7f81a458c700 (LWP 1038)] [New Thread 0x7f81a45b7700 (LWP 1037)] Loaded symbols for /lib/libpthread.so.0 Reading symbols from /lib/libdl.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/libdl.so.2 Reading symbols from /usr/lib/libstdc++.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libstdc++.so.6 Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done. Loaded symbols for /lib/libc.so.6 Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done. Loaded symbols for /lib64/ld-linux-x86-64.so.2 Reading symbols from /lib/libm.so.6...(no debugging symbols found)...done. Loaded symbols for /lib/libm.so.6 Reading symbols from /lib/libgcc_s.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libgcc_s.so.1 Reading symbols from /usr/lib/virtualbox/VBoxRT.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxRT.so Reading symbols from /lib/libcrypt.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libcrypt.so.1 Reading symbols from /lib/libz.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libz.so.1 Reading symbols from /lib/librt.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/librt.so.1 Reading symbols from /lib/libcrypto.so.0.9.8...(no debugging symbols found)...done. Loaded symbols for /lib/libcrypto.so.0.9.8 Reading symbols from /usr/lib/libxml2.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libxml2.so.2 Reading symbols from /usr/lib/libcurl.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libcurl.so.4 Reading symbols from /usr/lib/libidn.so.11...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libidn.so.11 Reading symbols from /usr/lib/liblber-2.4.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/liblber-2.4.so.2 Reading symbols from /usr/lib/libldap_r-2.4.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libldap_r-2.4.so.2 Reading symbols from /usr/lib/libgssapi_krb5.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgssapi_krb5.so.2 Reading symbols from /lib/libssl.so.0.9.8...(no debugging symbols found)...done. Loaded symbols for /lib/libssl.so.0.9.8 Reading symbols from /lib/libresolv.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/libresolv.so.2 Reading symbols from /usr/lib/libsasl2.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libsasl2.so.2 Reading symbols from /usr/lib/libgnutls.so.26...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgnutls.so.26 Reading symbols from /lib/libgcrypt.so.11...(no debugging symbols found)...done. Loaded symbols for /lib/libgcrypt.so.11 Reading symbols from /usr/lib/libkrb5.so.3...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libkrb5.so.3 Reading symbols from /usr/lib/libk5crypto.so.3...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libk5crypto.so.3 Reading symbols from /lib/libcom_err.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/libcom_err.so.2 Reading symbols from /usr/lib/libkrb5support.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libkrb5support.so.0 Reading symbols from /usr/lib/libtasn1.so.3...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libtasn1.so.3 Reading symbols from /lib/libgpg-error.so.0...(no debugging symbols found)...done. Loaded symbols for /lib/libgpg-error.so.0 Reading symbols from /lib/libkeyutils.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libkeyutils.so.1 Reading symbols from /usr/lib/virtualbox/VirtualBox.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VirtualBox.so Reading symbols from /usr/lib/libXinerama.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXinerama.so.1 Reading symbols from /usr/lib/nvidia-current/libGL.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/nvidia-current/libGL.so.1 Reading symbols from /usr/lib/virtualbox/VBoxVMM.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxVMM.so Reading symbols from /usr/lib/virtualbox/VBoxKeyboard.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxKeyboard.so Reading symbols from /usr/lib/libXcursor.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXcursor.so.1 Reading symbols from /usr/lib/libXext.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXext.so.6 Reading symbols from /usr/lib/libX11.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libX11.so.6 Reading symbols from /usr/lib/virtualbox/VBoxXPCOM.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxXPCOM.so Reading symbols from /usr/lib/libQtCore.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libQtCore.so.4 Reading symbols from /usr/lib/libQtGui.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libQtGui.so.4 Reading symbols from /usr/lib/libQtNetwork.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libQtNetwork.so.4 Reading symbols from /usr/lib/libQtOpenGL.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libQtOpenGL.so.4 Reading symbols from /usr/lib/libSDL-1.2.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libSDL-1.2.so.0 Reading symbols from /usr/lib/nvidia-current/tls/libnvidia-tls.so.270.29...(no debugging symbols found)...done. Loaded symbols for /usr/lib/nvidia-current/tls/libnvidia-tls.so.270.29 Reading symbols from /usr/lib/nvidia-current/libnvidia-glcore.so.270.29...(no debugging symbols found)...done. Loaded symbols for /usr/lib/nvidia-current/libnvidia-glcore.so.270.29 Reading symbols from /usr/lib/virtualbox/VBoxREM.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxREM.so Reading symbols from /usr/lib/libXrender.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXrender.so.1 Reading symbols from /usr/lib/libXfixes.so.3...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXfixes.so.3 Reading symbols from /usr/lib/libxcb.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libxcb.so.1 Reading symbols from /usr/lib/libgthread-2.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgthread-2.0.so.0 Reading symbols from /lib/libglib-2.0.so.0...(no debugging symbols found)...done. Loaded symbols for /lib/libglib-2.0.so.0 Reading symbols from /usr/lib/libfontconfig.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libfontconfig.so.1 Reading symbols from /usr/lib/libaudio.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libaudio.so.2 Reading symbols from /lib/libpng12.so.0...(no debugging symbols found)...done. Loaded symbols for /lib/libpng12.so.0 Reading symbols from /usr/lib/libfreetype.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libfreetype.so.6 Reading symbols from /usr/lib/libgobject-2.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgobject-2.0.so.0 Reading symbols from /usr/lib/libSM.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libSM.so.6 Reading symbols from /usr/lib/libICE.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libICE.so.6 Reading symbols from /usr/lib/libXi.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXi.so.6 Reading symbols from /usr/lib/libasound.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libasound.so.2 Reading symbols from /usr/lib/libXau.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXau.so.6 Reading symbols from /usr/lib/libXdmcp.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXdmcp.so.6 Reading symbols from /lib/libpcre.so.3...(no debugging symbols found)...done. Loaded symbols for /lib/libpcre.so.3 Reading symbols from /lib/libexpat.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libexpat.so.1 Reading symbols from /usr/lib/libXt.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXt.so.6 Reading symbols from /lib/libuuid.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libuuid.so.1 Reading symbols from /usr/lib/gconv/UTF-16.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/gconv/UTF-16.so Reading symbols from /usr/lib/libXrandr.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXrandr.so.2 Reading symbols from /usr/lib/kde4/plugins/gui_platform/libkde.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/gui_platform/libkde.so Reading symbols from /usr/lib/libkio.so.5...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libkio.so.5 Reading symbols from /usr/lib/libkdeui.so.5...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libkdeui.so.5 Reading symbols from /usr/lib/libkdecore.so.5...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libkdecore.so.5 Reading symbols from /usr/lib/libnepomuk.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libnepomuk.so.4 Reading symbols from /usr/lib/libnepomukutils.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libnepomukutils.so.4 Reading symbols from /usr/lib/libstreamanalyzer.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libstreamanalyzer.so.0 Reading symbols from /usr/lib/libQtXml.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libQtXml.so.4 Reading symbols from /usr/lib/libQtSvg.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libQtSvg.so.4 Reading symbols from /usr/lib/libsolid.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libsolid.so.4 Reading symbols from /lib/libacl.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libacl.so.1 Reading symbols from /lib/libattr.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libattr.so.1 Reading symbols from /usr/lib/libQtDBus.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libQtDBus.so.4 Reading symbols from /usr/lib/libattica.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libattica.so.0 Reading symbols from /usr/lib/libdbusmenu-qt.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libdbusmenu-qt.so.2 Reading symbols from /lib/libbz2.so.1.0...(no debugging symbols found)...done. Loaded symbols for /lib/libbz2.so.1.0 Reading symbols from /usr/lib/liblzma.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/liblzma.so.2 Reading symbols from /usr/lib/libsoprano.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libsoprano.so.4 Reading symbols from /usr/lib/libsopranoclient.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libsopranoclient.so.1 Reading symbols from /usr/lib/libnepomukquery.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libnepomukquery.so.4 Reading symbols from /usr/lib/libstreams.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libstreams.so.0 Reading symbols from /lib/libudev.so.0...(no debugging symbols found)...done. Loaded symbols for /lib/libudev.so.0 Reading symbols from /lib/libdbus-1.so.3...(no debugging symbols found)...done. Loaded symbols for /lib/libdbus-1.so.3 Reading symbols from /usr/lib/kde4/plugins/styles/oxygen.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/styles/oxygen.so Reading symbols from /usr/lib/liboxygenstyle.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/liboxygenstyle.so.4 Reading symbols from /usr/lib/virtualbox/components/VBoxXPCOMIPCC.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/components/VBoxXPCOMIPCC.so Reading symbols from /lib/libnss_compat.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/libnss_compat.so.2 Reading symbols from /lib/libnsl.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libnsl.so.1 Reading symbols from /lib/libnss_nis.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/libnss_nis.so.2 Reading symbols from /lib/libnss_files.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/libnss_files.so.2 Reading symbols from /usr/lib/virtualbox/components/VBoxSVCM.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/components/VBoxSVCM.so Reading symbols from /usr/lib/qt4/plugins/imageformats/libqgif.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/qt4/plugins/imageformats/libqgif.so Reading symbols from /usr/lib/qt4/plugins/imageformats/libqico.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/qt4/plugins/imageformats/libqico.so Reading symbols from /usr/lib/qt4/plugins/imageformats/libqjpeg.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/qt4/plugins/imageformats/libqjpeg.so Reading symbols from /usr/lib/libjpeg.so.62...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libjpeg.so.62 Reading symbols from /usr/lib/qt4/plugins/imageformats/libqmng.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/qt4/plugins/imageformats/libqmng.so Reading symbols from /usr/lib/libmng.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libmng.so.1 Reading symbols from /usr/lib/liblcms.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/liblcms.so.1 Reading symbols from /usr/lib/qt4/plugins/imageformats/libqsvg.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/qt4/plugins/imageformats/libqsvg.so Reading symbols from /usr/lib/qt4/plugins/imageformats/libqtiff.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/qt4/plugins/imageformats/libqtiff.so Reading symbols from /usr/lib/libtiff.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libtiff.so.4 Reading symbols from /usr/lib/kde4/plugins/imageformats/kimg_dds.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/imageformats/kimg_dds.so Reading symbols from /usr/lib/kde4/plugins/imageformats/kimg_eps.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/imageformats/kimg_eps.so Reading symbols from /usr/lib/kde4/plugins/imageformats/kimg_exr.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/imageformats/kimg_exr.so Reading symbols from /usr/lib/libIlmImf.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libIlmImf.so.6 Reading symbols from /usr/lib/libIex.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libIex.so.6 Reading symbols from /usr/lib/libHalf.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libHalf.so.6 Reading symbols from /usr/lib/libImath.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libImath.so.6 Reading symbols from /usr/lib/libIlmThread.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libIlmThread.so.6 Reading symbols from /usr/lib/kde4/plugins/imageformats/kimg_jp2.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/imageformats/kimg_jp2.so Reading symbols from /usr/lib/libjasper.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libjasper.so.1 Reading symbols from /usr/lib/kde4/plugins/imageformats/kimg_pcx.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/imageformats/kimg_pcx.so Reading symbols from /usr/lib/kde4/plugins/imageformats/kimg_pic.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/imageformats/kimg_pic.so Reading symbols from /usr/lib/kde4/plugins/imageformats/kimg_psd.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/imageformats/kimg_psd.so Reading symbols from /usr/lib/kde4/plugins/imageformats/kimg_ras.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/imageformats/kimg_ras.so Reading symbols from /usr/lib/kde4/plugins/imageformats/kimg_rgb.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/imageformats/kimg_rgb.so Reading symbols from /usr/lib/kde4/plugins/imageformats/kimg_tga.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/imageformats/kimg_tga.so Reading symbols from /usr/lib/kde4/plugins/imageformats/kimg_xcf.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/imageformats/kimg_xcf.so Reading symbols from /usr/lib/kde4/plugins/imageformats/kimg_xview.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/kde4/plugins/imageformats/kimg_xview.so Reading symbols from /usr/lib/virtualbox/components/VBoxC.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/components/VBoxC.so Reading symbols from /usr/lib/virtualbox/ExtensionPacks/Oracle_VM_VirtualBox_Extension_Pack/linux.amd64/VBoxPuelMain.so...done. Loaded symbols for /usr/lib/virtualbox/ExtensionPacks/Oracle_VM_VirtualBox_Extension_Pack/linux.amd64/VBoxPuelMain.so Reading symbols from /usr/lib/qt4/plugins/menubar/libappmenu-qt.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/qt4/plugins/menubar/libappmenu-qt.so Reading symbols from /usr/lib/virtualbox/VBoxSharedClipboard.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxSharedClipboard.so Reading symbols from /usr/lib/virtualbox/VBoxSharedCrOpenGL.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxSharedCrOpenGL.so Reading symbols from /usr/lib/virtualbox/VBoxOGLhostcrutil.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxOGLhostcrutil.so Reading symbols from /usr/lib/virtualbox/VBoxOGLrenderspu.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxOGLrenderspu.so Reading symbols from /usr/lib/libXmu.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXmu.so.6 Reading symbols from /usr/lib/virtualbox/VBoxOGLhosterrorspu.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxOGLhosterrorspu.so Reading symbols from /usr/lib/virtualbox/VBoxGuestPropSvc.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxGuestPropSvc.so Reading symbols from /usr/lib/virtualbox/VBoxGuestControlSvc.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxGuestControlSvc.so Reading symbols from /usr/lib/virtualbox/VBoxDD.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxDD.so Reading symbols from /usr/lib/virtualbox/VBoxDDU.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxDDU.so Reading symbols from /usr/lib/virtualbox/VBoxDD2.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxDD2.so Reading symbols from /usr/lib/virtualbox/ExtensionPacks/Oracle_VM_VirtualBox_Extension_Pack/linux.amd64/VBoxEhciR3.so...done. Loaded symbols for /usr/lib/virtualbox/ExtensionPacks/Oracle_VM_VirtualBox_Extension_Pack/linux.amd64/VBoxEhciR3.so Reading symbols from /usr/lib/virtualbox/VBoxSharedFolders.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/virtualbox/VBoxSharedFolders.so Reading symbols from /usr/lib/libpulse.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libpulse.so.0 Reading symbols from /usr/lib/libpulsecommon-0.9.22.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libpulsecommon-0.9.22.so Reading symbols from /usr/lib/libxcb-atom.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libxcb-atom.so.1 Reading symbols from /lib/libwrap.so.0...(no debugging symbols found)...done. Loaded symbols for /lib/libwrap.so.0 Reading symbols from /usr/lib/libsndfile.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libsndfile.so.1 Reading symbols from /usr/lib/libFLAC.so.8...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libFLAC.so.8 Reading symbols from /usr/lib/libvorbisenc.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libvorbisenc.so.2 Reading symbols from /usr/lib/libvorbis.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libvorbis.so.0 Reading symbols from /usr/lib/libogg.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libogg.so.0 Reading symbols from /usr/lib/alsa-lib/libasound_module_pcm_pulse.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/alsa-lib/libasound_module_pcm_pulse.so 0x00007f81a39a5003 in poll () from /lib/libc.so.6 (gdb) cont Continuing. Program received signal SIGSEGV, Segmentation fault. 0x00007f819cc41a63 in ?? () from /usr/lib/libQtGui.so.4 (gdb) backtrace full #0 0x00007f819cc41a63 in ?? () from /usr/lib/libQtGui.so.4 No symbol table info available. #1 0x00007f819cc474eb in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4 No symbol table info available. #2 0x00007f819cc6f272 in ?? () from /usr/lib/libQtGui.so.4 No symbol table info available. #3 0x00007f8199567c2d in g_main_context_dispatch () from /lib/libglib-2.0.so.0 No symbol table info available. #4 0x00007f8199568418 in ?? () from /lib/libglib-2.0.so.0 No symbol table info available. #5 0x00007f81995686a9 in g_main_context_iteration () from /lib/libglib-2.0.so.0 No symbol table info available. #6 0x00007f819d82da3f in QEventDispatcherGlib::processEvents(QFlags) () from /usr/lib/libQtCore.so.4 No symbol table info available. #7 0x00007f819cc6ef0e in ?? () from /usr/lib/libQtGui.so.4 No symbol table info available. #8 0x00007f819d801f02 in QEventLoop::processEvents(QFlags) () from /usr/lib/libQtCore.so.4 No symbol table info available. #9 0x00007f819d80213c in QEventLoop::exec(QFlags) () from /usr/lib/libQtCore.so.4 No symbol table info available. #10 0x00007f819d80654b in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4 No symbol table info available. #11 0x00007f819f114999 in TrustedMain () from /usr/lib/virtualbox/VirtualBox.so No symbol table info available. #12 0x00007f81a38eaefe in __libc_start_main () from /lib/libc.so.6 No symbol table info available. #13 0x00000000004011d9 in ?? () No symbol table info available. #14 0x00007fff8d7f36d8 in ?? () No symbol table info available. #15 0x000000000000001c in ?? () No symbol table info available. #16 0x0000000000000006 in ?? () No symbol table info available. #17 0x00007fff8d7f4aa7 in ?? () No symbol table info available. #18 0x00007fff8d7f4ac6 in ?? () No symbol table info available. #19 0x00007fff8d7f4ad0 in ?? () No symbol table info available. #20 0x00007fff8d7f4adf in ?? () No symbol table info available. #21 0x00007fff8d7f4ae9 in ?? () No symbol table info available. #22 0x00007fff8d7f4b0e in ?? () No symbol table info available. #23 0x0000000000000000 in ?? () No symbol table info available. (gdb) #0 0x00007f819cc41a63 in ?? () from /usr/lib/libQtGui.so.4 No symbol table info available. #1 0x00007f819cc474eb in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4 No symbol table info available. #2 0x00007f819cc6f272 in ?? () from /usr/lib/libQtGui.so.4 No symbol table info available. #3 0x00007f8199567c2d in g_main_context_dispatch () from /lib/libglib-2.0.so.0 No symbol table info available. #4 0x00007f8199568418 in ?? () from /lib/libglib-2.0.so.0 No symbol table info available. #5 0x00007f81995686a9 in g_main_context_iteration () from /lib/libglib-2.0.so.0 No symbol table info available. #6 0x00007f819d82da3f in QEventDispatcherGlib::processEvents(QFlags) () from /usr/lib/libQtCore.so.4 No symbol table info available. #7 0x00007f819cc6ef0e in ?? () from /usr/lib/libQtGui.so.4 No symbol table info available. #8 0x00007f819d801f02 in QEventLoop::processEvents(QFlags) () from /usr/lib/libQtCore.so.4 No symbol table info available. #9 0x00007f819d80213c in QEventLoop::exec(QFlags) () from /usr/lib/libQtCore.so.4 No symbol table info available. #10 0x00007f819d80654b in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4 No symbol table info available. #11 0x00007f819f114999 in TrustedMain () from /usr/lib/virtualbox/VirtualBox.so No symbol table info available. #12 0x00007f81a38eaefe in __libc_start_main () from /lib/libc.so.6 No symbol table info available. #13 0x00000000004011d9 in ?? () No symbol table info available. #14 0x00007fff8d7f36d8 in ?? () No symbol table info available. #15 0x000000000000001c in ?? () No symbol table info available. #16 0x0000000000000006 in ?? () No symbol table info available. #17 0x00007fff8d7f4aa7 in ?? () No symbol table info available. #18 0x00007fff8d7f4ac6 in ?? () No symbol table info available. #19 0x00007fff8d7f4ad0 in ?? () No symbol table info available. #20 0x00007fff8d7f4adf in ?? () No symbol table info available. #21 0x00007fff8d7f4ae9 in ?? () No symbol table info available. #22 0x00007fff8d7f4b0e in ?? () No symbol table info available. #23 0x0000000000000000 in ?? () No symbol table info available. (gdb)