Public bug reported:

Description:    KDE neon User Edition 5.14
Release:        18.04
(but also happens on fres install of ubuntu 18.04)


Application: x2goclient (x2goclient), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ff0f2520cc0 (LWP 4264))]

Thread 4 (Thread 0x7ff0c4e36700 (LWP 4272)):
[KCrash Handler]
#6  0x00007ff0f2105f1f in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#7  0x00007ff0f210720a in ?? () from /usr/lib/x86_64-linux-gnu/libssh.so.4
#8  0x00007ff0f20f1903 in ssh_channel_poll () from 
/usr/lib/x86_64-linux-gnu/libssh.so.4
#9  0x00005640f90836e1 in ?? ()
#10 0x00005640f9087b6f in ?? ()
#11 0x00007ff0ef672adb in QThreadPrivate::start (arg=0x5640fa26f650) at 
thread/qthread_unix.cpp:367
#12 0x00007ff0ef3ab6db in start_thread (arg=0x7ff0c4e36700) at 
pthread_create.c:463
#13 0x00007ff0eeb3388f in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7ff0d2215700 (LWP 4267)):
#0  0x00007ff0eb0527d9 in g_main_context_prepare () from 
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007ff0eb05336b in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff0eb05354c in g_main_context_iteration () from 
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff0ef89853b in QEventDispatcherGlib::processEvents 
(this=0x7ff0cc000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007ff0ef83c7fa in QEventLoop::exec (this=this@entry=0x7ff0d2214d30, 
flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#5  0x00007ff0ef667bba in QThread::exec (this=<optimized out>) at 
thread/qthread.cpp:525
#6  0x00007ff0e3085e45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007ff0ef672adb in QThreadPrivate::start (arg=0x7ff0e32fdd60) at 
thread/qthread_unix.cpp:367
#8  0x00007ff0ef3ab6db in start_thread (arg=0x7ff0d2215700) at 
pthread_create.c:463
#9  0x00007ff0eeb3388f in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7ff0e0135700 (LWP 4266)):
#0  0x00007ff0eeb26bf9 in __GI___poll (fds=0x7ff0e0134c68, nfds=1, timeout=-1) 
at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ff0ec968747 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007ff0ec96a36a in xcb_wait_for_event () from 
/usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007ff0e3587ed9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007ff0ef672adb in QThreadPrivate::start (arg=0x5640f9e02f70) at 
thread/qthread_unix.cpp:367
#5  0x00007ff0ef3ab6db in start_thread (arg=0x7ff0e0135700) at 
pthread_create.c:463
#6  0x00007ff0eeb3388f in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7ff0f2520cc0 (LWP 4264)):
#0  0x00007ff0ef3b19f3 in futex_wait_cancelable (private=<optimized out>, 
expected=0, futex_word=0x7ffc5008e2a8) at 
../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x5640f9df8898, 
cond=0x7ffc5008e280) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x7ffc5008e280, mutex=0x5640f9df8898) at 
pthread_cond_wait.c:655
#3  0x00007ff0ec968952 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#4  0x00007ff0ec96a06f in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#5  0x00007ff0ec96a1ef in xcb_wait_for_reply64 () from 
/usr/lib/x86_64-linux-gnu/libxcb.so.1
#6  0x00007ff0f17046a8 in _XReply () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#7  0x00007ff0f16fb092 in XQueryTree () from 
/usr/lib/x86_64-linux-gnu/libX11.so.6
#8  0x00005640f901f7e4 in ?? ()
#9  0x00005640f901fb28 in ?? ()
#10 0x00005640f905812e in ?? ()
#11 0x00005640f90e169c in ?? ()
#12 0x00007ff0ef86d565 in QMetaObject::activate 
(sender=sender@entry=0x5640f9febd10, signalOffset=<optimized out>, 
local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffc5008e730) 
at kernel/qobject.cpp:3771
#13 0x00007ff0ef86dc37 in QMetaObject::activate 
(sender=sender@entry=0x5640f9febd10, m=m@entry=0x7ff0efcc2da0 
<QTimer::staticMetaObject>, local_signal_index=local_signal_index@entry=0, 
argv=argv@entry=0x7ffc5008e730) at kernel/qobject.cpp:3633
#14 0x00007ff0ef87a337 in QTimer::timeout (this=this@entry=0x5640f9febd10, 
_t1=...) at .moc/moc_qtimer.cpp:200
#15 0x00007ff0ef87a698 in QTimer::timerEvent (this=0x5640f9febd10, e=<optimized 
out>) at kernel/qtimer.cpp:255
#16 0x00007ff0ef86e08b in QObject::event (this=0x5640f9febd10, e=<optimized 
out>) at kernel/qobject.cpp:1273
#17 0x00007ff0f0b64e1c in QApplicationPrivate::notify_helper(QObject*, QEvent*) 
() from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007ff0f0b6c3ef in QApplication::notify(QObject*, QEvent*) () from 
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007ff0ef83e4d8 in QCoreApplication::notifyInternal2 
(receiver=0x5640f9febd10, event=event@entry=0x7ffc5008ea30) at 
kernel/qcoreapplication.cpp:1048
#20 0x00007ff0ef8979ae in QCoreApplication::sendEvent (event=0x7ffc5008ea30, 
receiver=<optimized out>) at 
../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#21 QTimerInfoList::activateTimers (this=0x5640f9e42950) at 
kernel/qtimerinfo_unix.cpp:643
#22 0x00007ff0ef8981a9 in timerSourceDispatch (source=<optimized out>) at 
kernel/qeventdispatcher_glib.cpp:182
#23 idleTimerSourceDispatch (source=<optimized out>) at 
kernel/qeventdispatcher_glib.cpp:229
#24 0x00007ff0eb053287 in g_main_context_dispatch () from 
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007ff0eb0534c0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007ff0eb05354c in g_main_context_iteration () from 
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007ff0ef89853b in QEventDispatcherGlib::processEvents 
(this=0x5640f9e41cd0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#28 0x00007ff0e3613761 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#29 0x00007ff0ef83c7fa in QEventLoop::exec (this=this@entry=0x7ffc5008eca0, 
flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#30 0x00007ff0ef8459c0 in QCoreApplication::exec () at 
kernel/qcoreapplication.cpp:1336
#31 0x00005640f90b32f3 in ?? ()
#32 0x00005640f90dfe0d in ?? ()
#33 0x00005640f8fef4f2 in ?? ()
#34 0x00007ff0eea33b97 in __libc_start_main (main=0x5640f8fef330, argc=2, 
argv=0x7ffc5008efb8, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7ffc5008efa8) at ../csu/libc-start.c:310
#35 0x00005640f8fef5da in ?? ()

x2go-DEBUG-../src/onmainwindow.cpp:5987> "Starting NX proxy, command: nxproxy 
-S 
nx/nx,options=/home/michaelc/.x2go/S-testmichael-63-1540426656_stDgnome-session-wrapper_dp24/options:63"
x2go-DEBUG-../src/sshprocess.cpp:157> Direct tunnel: waiting for connections on 
"localhost":39913
x2go-DEBUG-../src/onmainwindow.cpp:6459> Proxy wrote on stderr: "\nNXPROXY - 
Version 3.5.99.16\n\nCopyright (c) 2001, 2011 NoMachine 
(http://www.nomachine.com)\nCopyright (c) 2008-2014 Oleksandr Shneyder 
<o.shney...@phoca-gmbh.de>\nCopyright (c) 2014-2016 Ulrich Sibiller 
<ul...@gmx.de>\nCopyright (c) 2014-2016 Mihai Moldovan 
<io...@ionic.de>\nCopyright (c) 2011-2016 Mike Gabriel 
<mike.gabr...@das-netzwerkteam.de>\nCopyright (c) 2015-2016 Qindel Group 
(http://www.qindel.com)\n\nNXCOMP, NX protocol compression and NX extensions to 
this software\nare copyright of the aforementioned persons and 
companies.\n\nRedistribution and use of the present software is allowed 
according\nto terms specified in the file LICENSE.nxcomp which comes in 
the\nsource distribution.\n\nAll rights reserved.\n\nNOTE: This software has 
received contributions from various other\ncontributors, only the core 
maintainers and supporters are listed as\ncopyright holders. Please contact us, 
if you feel you should be listed\nas copyright holder, as well.\n\nNX protocol 
compression is derived from DXPC project.\n\nCopyright (c) 1995,1996 Brian 
Pane\nCopyright (c) 1996,1997 Zachary Vonler and Brian Pane\nCopyright (c) 1999 
Kevin Vigor and Brian Pane\nCopyright (c) 2000,2003 Gian Filippo Pinzari and 
Brian Pane\n\nAll rights reserved.\n\nSee 
https://github.com/ArcticaProject/nx-libs for more information.\n\nInfo: Proxy 
running in server mode with pid '4279'.\nSession: Starting session at 'Thu Oct 
25 11:17:38 2018'.\nInfo: Using errors file 
'/home/michaelc/.x2go/S-testmichael-63-1540426656_stDgnome-session-wrapper_dp24/sessions'.\nInfo:
 Using stats file '/home/michaelc/.x2go/S-63/stats'.\nLoop: WARNING! Overriding 
auxiliary X11 port with new value '1'.\nWarning: Overriding auxiliary X11 port 
with new value '1'.\nInfo: Using abstract X11 socket in kernel namespace for 
accessing DISPLAY=:0.\nInfo: Connecting to remote host 
'localhost:39913'.\nInfo: Connected to remote proxy on FD#5.\n"
x2go-DEBUG-../src/sshprocess.cpp:109> New TCP connection.
x2go-DEBUG-../src/sshprocess.cpp:114> New socket: 19
x2go-DEBUG-../src/sshmasterconnection.cpp:2066> Creating new channel.

x2go-DEBUG-../src/sshmasterconnection.cpp:2083> New
channel:0x7ff0bc00d9d0

x2go-DEBUG-../src/sshmasterconnection.cpp:2089> Forwarding parameters: from 
remote ("localhost":38913) to local ("localhost":41452)
x2go-DEBUG-../src/sshmasterconnection.cpp:2126> Temporary session port after 
config file parse: 38913
x2go-DEBUG-../src/sshmasterconnection.cpp:2130> Temporary session host after 
config file parse: localhost
x2go-DEBUG-../src/sshmasterconnection.cpp:2160> New channel forwarded.

x2go-DEBUG-../src/onmainwindow.cpp:6459> Proxy wrote on stderr: "Loop: WARNING! 
Disabling NX delta compression.\nLoop: WARNING! Disabling use of NX persistent 
cache.\n"
x2go-DEBUG-../src/onmainwindow.cpp:6459> Proxy wrote on stderr: "Info: 
Connection with remote proxy completed.\nLoop: WARNING! Unrecognized session 
type 'unix-kde-depth_24'. Assuming agent session.\nWarning: Unrecognized 
session type 'unix-kde-depth_24'. Assuming agent session.\n"
x2go-DEBUG-../src/onmainwindow.cpp:6459> Proxy wrote on stderr: "Info: Using 
LAN link parameters 1536/24/1/0.\nInfo: Using pack method '256k-jpeg-9' with 
session 'unix-kde-depth_24'.\nInfo: Not using NX delta compression.\nInfo: Not 
using ZLIB data compression.\nInfo: Not using ZLIB stream compression.\nInfo: 
Not using a persistent cache.\nInfo: Forwarding X11 connections to display 
':0'.\nInfo: Forwarding auxiliary X11 connections to display ':0'.\nSession: 
Session started at 'Thu Oct 25 11:17:38 2018'.\n"
x2go-DEBUG-../src/onmainwindow.cpp:11462> "Searching proxy window: 
X2GO-testmichael-63-1540426656_stDgnome-session-wrapper_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:13074> "Searching window with title: 
X2GO-testmichael-63-1540426656_stDgnome-session-wrapper_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:11462> "Searching proxy window: 
X2GO-testmichael-63-1540426656_stDgnome-session-wrapper_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:13074> "Searching window with title: 
X2GO-testmichael-63-1540426656_stDgnome-session-wrapper_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:6459> Proxy wrote on stderr: "Info: 
Established X server connection.\n"
x2go-DEBUG-../src/sshprocess.cpp:199> Executing remote command via SshProcess 
object 3: "x2gobasepath"
x2go-DEBUG-../src/sshprocess.cpp:213> this=SshProcess(0x5640fa2cb6d0) Running 
masterCon->addChannelConnection(this, '"6bef4fe0-9a3d-49ef-95ef-d3e522c26fcb"', 
'"bash -l -c 'echo \"X2GODATABEGIN:6bef4fe0-9a3d-49ef-95ef-d3e522c26fcb\"; 
export PATH=\"/usr/local/bin:/usr/bin:/bin\";export TERM=\"dumb\"; 
x2gobasepath; echo \"X2GODATAEND:6bef4fe0-9a3d-49ef-95ef-d3e522c26f"');
x2go-DEBUG-../src/sshmasterconnection.cpp:1874> Locking SSH channel connection 
MUTEX.
x2go-DEBUG-../src/sshmasterconnection.cpp:1876> Passing new channel connection 
object to channelConnections.
x2go-DEBUG-../src/sshmasterconnection.cpp:1878> Unlocking SSH channel 
connection MUTEX.
x2go-DEBUG-../src/sshmasterconnection.cpp:2066> Creating new channel.

x2go-DEBUG-../src/sshmasterconnection.cpp:2083> New
channel:0x7ff0bc059080

x2go-DEBUG-../src/sshmasterconnection.cpp:2168> Executing remote: "bash
-l -c 'echo \"X2GODATABEGIN:6bef4fe0-9a3d-49ef-95ef-d3e522c26fcb\";
export PATH=\"/usr/local/bin:/usr/bin:/bin\";export TERM=\"dumb\";
x2gobasepath; echo \"X2GODATAEND:6bef4fe0-9a3d-49ef-95ef-
d3e522c26fcb\";'"

x2go-DEBUG-../src/onmainwindow.cpp:11462> "Searching proxy window: 
X2GO-testmichael-63-1540426656_stDgnome-session-wrapper_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:13074> "Searching window with title: 
X2GO-testmichael-63-1540426656_stDgnome-session-wrapper_dp24"
x2go-DEBUG-../src/sshmasterconnection.cpp:2191> New exec channel created.

QSocketNotifier: Invalid socket 6 and type 'Read', disabling...
QSocketNotifier: Invalid socket 23 and type 'Read', disabling...
QSocketNotifier: Invalid socket 21 and type 'Read', disabling...
QSocketNotifier: Invalid socket 27 and type 'Read', disabling...
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = x2goclient path = /usr/bin pid = 4264
KCrash: Arguments: /usr/bin/x2goclient --debug 
KCrash: Attempting to start /usr/lib/x86_64-linux-gnu/libexec/drkonqi from 
kdeinit
sock_file=/run/user/1098200003/kdeinit5__0
x2go-DEBUG-../src/onmainwindow.cpp:11462> "Searching proxy window: 
X2GO-testmichael-63-1540426656_stDgnome-session-wrapper_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:13074> "Searching window with title: 
X2GO-testmichael-63-1540426656_stDgnome-session-wrapper_dp24"

[1]+  Stopped                 x2goclient --debug
[michaelc@hammer ~]$ QSocketNotifier: Invalid socket 8 and type 'Read', 
disabling...
QSocketNotifier: Invalid socket 11 and type 'Read', disabling...

** Affects: x2goclient (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1799849

Title:
  segfault when starting new session

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