X2Go Bug report logs - #249
Segmentation fault in x2goclient

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X-Loop: owner@bugs.x2go.org
Subject: Bug#249: Segfaults in x2goclient as well as in pyhoca-gui (both stable on Wheezy) when trying to connect to a nightly server on Ubuntu 14.04
Reply-To: Axel Beckert <abe@deuxchevaux.org>, 249@bugs.x2go.org
Resent-From: Axel Beckert <abe@deuxchevaux.org>
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Date: Thu, 8 May 2014 20:05:11 +0200
From: Axel Beckert <abe@deuxchevaux.org>
To: 249@bugs.x2go.org
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Organization: DeuxChevaux.org -- The Citroën 2CV Database
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Hi,

I just installed x2goserver (4.1.0.0-0~971~ubuntu14.04.1) on Ubuntu
14.04 Trusty and connected to it with x2goclient
(4.0.2.0-0x2go1+git20140410.586+wheezy.main.1) and later also with
pyhoca-gui (0.4.0.9-0x2go1+git20140108.1126+wheezy.main.1).

Both segfaulted while they worked fine when connecting to Wheezy
servers with x2goserver stable.

gdb Backtrace from pyhoca-gui:

Starting program: /usr/bin/python /usr/bin/pyhoca-gui -P xtaran@bluesky
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Xlib.protocol.request.QueryExtension
pyhoca-gui[8842] (PyHoca-GUI) WARN: the current release of PyHoca-GUI does not support client configuration
pyhoca-gui[8842] (PyHoca-GUI) NOTICE: opening default session profile xtaran@bluesky
pyhoca-gui[8842] (x2gosessregistry-pylib) NOTICE: registering X2Go session xtaran@bluesky...
pyhoca-gui[8842] (x2goclient-pylib) NOTICE: initializing X2Go session...
pyhoca-gui[8842] (x2gocontrolsession-pylib) NOTICE: connecting to [bluesky]:22

Program received signal SIGSEGV, Segmentation fault.
0x00000000004d3e9d in ?? ()
(gdb) bt
#0  0x00000000004d3e9d in ?? ()
#1  0x00000000004f3482 in PyErr_WarnEx ()
#2  0x00007fffe78b5b84 in ?? () from /usr/lib/python2.7/dist-packages/gobject/_gobject.so
#3  0x00007ffff11fb473 in g_logv () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ffff11fb622 in g_log () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ffff16c5b6f in g_signal_handler_disconnect () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#6  0x00007fffe5ab14d0 in ?? () from /usr/lib/x86_64-linux-gnu/gtk-2.0/2.10.0/immodules/im-uim.so
#7  0x00007ffff16ba638 in g_object_unref () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#8  0x00007ffff2db1fb1 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#9  0x00007ffff2db21e0 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#10 0x00007ffff16ba638 in g_object_unref () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#11 0x00007ffff3f81aa6 in wxWindow::~wxWindow() () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-2.8.so.0
#12 0x00007ffff441df53 in wxSplashScreenWindow::~wxSplashScreenWindow() () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_adv-2.8.so.0
#13 0x00007ffff4049dd6 in wxWindowBase::DestroyChildren() () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-2.8.so.0
#14 0x00007ffff3f81a32 in wxWindow::~wxWindow() () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-2.8.so.0
#15 0x00007ffff441d5b9 in wxSplashScreen::~wxSplashScreen() () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_adv-2.8.so.0
#16 0x00007ffff3fe0422 in wxAppBase::DeletePendingObjects() () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-2.8.so.0
#17 0x00007ffff3fe05cb in wxAppBase::ProcessIdle() () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-2.8.so.0
#18 0x00007ffff3f5adae in ?? () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-2.8.so.0
#19 0x00007ffff11f4355 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007ffff11f4688 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007ffff11f4a82 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007ffff2dc7797 in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#23 0x00007ffff3f6e268 in wxEventLoop::Run() () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-2.8.so.0
#24 0x00007ffff3fe033c in wxAppBase::MainLoop() () from /usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-2.8.so.0
#25 0x00007ffff5350497 in wxPyApp::MainLoop() () from /usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode/wx/_core_.so
#26 0x00007ffff537732c in ?? () from /usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode/wx/_core_.so
#27 0x00000000004ae547 in PyEval_EvalFrameEx ()
#28 0x00000000004b1ef8 in PyEval_EvalCodeEx ()
#29 0x00000000004b2a6c in ?? ()
#30 0x00000000004c4894 in ?? ()
#31 0x00000000004aab70 in PyEval_EvalFrameEx ()
#32 0x00000000004aad10 in PyEval_EvalFrameEx ()
#33 0x00000000004aad10 in PyEval_EvalFrameEx ()
#34 0x00000000004b1ef8 in PyEval_EvalCodeEx ()
#35 0x000000000053b343 in ?? ()
#36 0x000000000044cc58 in PyRun_FileExFlags ()
#37 0x000000000044d152 in PyRun_SimpleFileExFlags ()
#38 0x000000000044dd42 in Py_Main ()
#39 0x00007ffff6fb4ead in __libc_start_main (main=<optimized out>, argc=<optimized out>, ubp_av=<optimized out>, init=<optimized out>, 
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffdf08) at libc-start.c:244
#40 0x00000000004c78b9 in _start ()

gdb Backtrace from x2goclient:

Starting program: /usr/bin/x2goclient --session=xtaran@bluesky
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
x2go-INFO-1> "Starting x2goclient..."
x2go-WARNING-1> "Can't load translator: :/x2goclient_en_us"
x2go-WARNING-2> "Can't load translator: :/qt_en_US"
x2go-INFO-3> "Started  x2goclient."
x2go-INFO-8> "Starting connection to server: bluesky:22"
[New Thread 0x7fffe9288700 (LWP 16089)]

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff5b50b67 in QString::operator=(QString const&) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
(gdb) bt
#0  0x00007ffff5b50b67 in QString::operator=(QString const&) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#1  0x00000000004602d0 in ?? ()
#2  0x0000000000479486 in ?? ()
#3  0x000000000047bd20 in ?? ()
#4  0x00000000004e1906 in ?? ()
#5  0x00007ffff5c1754f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00000000004e31e0 in ?? ()
#7  0x00000000004b4eb2 in ?? ()
#8  0x00000000004e33be in ?? ()
#9  0x00007ffff5c16a2e in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#10 0x00007ffff647670c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#11 0x00007ffff647ab8a in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#12 0x00007ffff5c01b5e in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#13 0x00007ffff5c059e1 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#14 0x00007ffff5c300e3 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#15 0x00007ffff25ca355 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007ffff25ca688 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007ffff25ca744 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007ffff5c30276 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#19 0x00007ffff651783e in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#20 0x00007ffff5c008af in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#21 0x00007ffff5c00b38 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#22 0x00007ffff5c05cf8 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#23 0x00000000004d7073 in ?? ()
#24 0x00007ffff4d5dead in __libc_start_main (main=<optimized out>, argc=<optimized out>, ubp_av=<optimized out>, init=<optimized out>, 
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffdf18) at libc-start.c:244
#25 0x000000000041ba71 in ?? ()
#26 0x00007fffffffdf18 in ?? ()
#27 0x000000000000001c in ?? ()
#28 0x0000000000000002 in ?? ()
#29 0x00007fffffffe28c in ?? ()
#30 0x00007fffffffe2a0 in ?? ()
#31 0x0000000000000000 in ?? ()

The segfaults on the Wheezy based clients vanished when I downgraded
the packages on Ubuntu 14.04 from the nightly debs to the stable debs
(i.e. x2goserver downgraded from 4.1.0.0-0~971~ubuntu14.04.1 to
4.0.1.15-0~847~ubuntu14.04.1)

HTH.

		Kind regards, Axel
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