Mar 26 09:22:17 ourwokstation /usr/bin/x2gostartagent[16213]: successfully started X2Go Agent session with ID agw-58-1553606535_stDMATE_dp32

Mar 26 09:22:19 ourwokstation /usr/bin/x2goruncommand[16676]: launching session with Xsession-x2go mechanism, using STARTUP="mate-session"

Mar 26 09:22:19 ourwokstation /usr/bin/x2goruncommand[16677]: dbus wrapper available as /usr/bin/dbus-run-session

Mar 26 09:22:24 ourwokstation gnome-keyring-daemon[16915]: couldn't access control socket: /run/user/1201/keyring/control: No such file or directory

Mar 26 09:22:24 ourwokstation mate-session[16692]: WARNING: keycode1 not existent

Mar 26 09:22:24 ourwokstation mate-session[16692]: WARNING: keycode2 not existent

Mar 26 09:22:30 ourwokstation mate-session[16692]: WARNING: Could not launch application 'dropbox.desktop': Unable to start application: Failed to execute child process “dropbox” (No such file or directory)

Mar 26 09:22:32 ourwokstation gnome-keyring-daemon[16915]: The SSH agent was already initialized

Mar 26 09:22:33 ourwokstation gnome-keyring-daemon[16915]: The PKCS#11 component was already initialized

Mar 26 09:22:33 ourwokstation pulseaudio[30825]: Invalid MIT-MAGIC-COOKIE-1 keyE: [pulseaudio] x11wrap.c: XOpenDisplay() failed

Mar 26 09:22:33 ourwokstation pulseaudio[30825]: E: [pulseaudio] module.c: Failed to load module "module-x11-publish" (argument: "display=:58"): initialization failed.

Mar 26 09:22:33 ourwokstation gnome-keyring-daemon[16915]: The Secret Service was already initialized

Mar 26 09:22:34 ourwokstation kernel: traps: x2goagent[16202] trap divide error ip:55c23629da1c sp:7ffe0df096e0 error:0 in nxagent[55c2361af000+319000]

Mar 26 09:22:34 ourwokstation systemd[1]: Started Process Core Dump (PID 17060/UID 0).

Mar 26 09:22:36 ourwokstation spice-vdagent[17111]: Cannot access vdagent virtio channel /dev/virtio-ports/com.redhat.spice.0

Mar 26 09:22:38 ourwokstation systemd-coredump[17061]: Process 16202 (x2goagent) of user 1201 dumped core.

#012#012Stack trace of thread 16202:#012#0  0x000055c23629da1c XkbAdjustGroup (nxagent)

#012#1  0x000055c23629daf5 XkbComputeDerivedState (nxagent)

#012#2  0x000055c236293ca6 ProcXkbLatchLockState (nxagent)

#012#3  0x000055c2361cfd18 Dispatch (nxagent)

#012#4  0x000055c2361b3821 main (nxagent)

#012#5  0x00007f64fdece413 __libc_start_main (libc.so.6)#012#6  0x000055c2361b3b5e _start (nxagent)

Mar 26 09:22:40 ourwokstation python3[17121]: detected unhandled Python exception in '/usr/bin/dnfdragora-updater'

Mar 26 09:22:41 ourwokstation systemd-logind[11665]: Session 25456 logged out. Waiting for processes to exit.

Mar 26 09:22:45 ourwokstation abrt-server[17301]: Package 'nxagent' isn't signed with proper key

Mar 26 09:22:46 ourwokstation abrt-server[17301]: 'post-create' on '/var/spool/abrt/ccpp-2019-03-26-09:22:39.879918-16202' exited with 1

Mar 26 09:22:46 ourwokstation abrt-server[17301]: Deleting problem directory '/var/spool/abrt/ccpp-2019-03-26-09:22:39.879918-16202'

Mar 26 09:22:46 ourwokstation abrt-server[17234]: Deleting problem directory Python3-2019-03-26-09:22:41-17121 (dup of Python3-2019-02-18-12:04:02-13003)

Mar 26 09:22:47 ourwokstation abrt-notification[17366]: Process 13003 (dnfdragora-updater) of user 1201 encountered an uncaught gi.repository.GLib.GError exception

Core was generated by `x2goagent -nolisten tcp -nolisten tcp -dpi 96 -D -auth /u/ourwokstation/agw/.Xauthori'.

Program terminated with signal SIGFPE, Arithmetic exception.

#0  0x000055c23629da1c in XkbAdjustGroup (group=<error reading variable: Division by zero>, ctrls=ctrls@entry=0x55c236e90810) at xkbUtils.c:688

688	xkbUtils.c: No such file or directory.

(gdb) bt full

#0  0x000055c23629da1c in XkbAdjustGroup (group=<error reading variable: Division by zero>, ctrls=ctrls@entry=0x55c236e90810) at xkbUtils.c:688

        act = 0

#1  0x000055c23629daf5 in XkbComputeDerivedState (xkbi=0x55c236ea5c10) at xkbUtils.c:714

        state = 0x55c236ea5c22

        ctrls = 0x55c236e90810

        grp = <optimized out>

#2  0x000055c236293ca6 in ProcXkbLatchLockState (client=0x55c2372372d0) at xkb.c:560

        status = <optimized out>

        dev = 0x55c236e6f6b0

        oldState = {group = 0 '\000', locked_group = 0 '\000', base_group = 0, latched_group = 0, mods = 0 '\000', base_mods = 0 '\000', latched_mods = 0 '\000', locked_mods = 0 '\000', 

          compat_state = 0 '\000', grab_mods = 0 '\000', compat_grab_mods = 0 '\000', lookup_mods = 0 '\000', compat_lookup_mods = 0 '\000', ptr_buttons = 0}

        newState = 0x55c236ea5c22

        changed = <optimized out>

        stuff = <optimized out>

#3  0x000055c2361cfd18 in Dispatch () at NXdispatch.c:482

        clientReady = 0x55c236e8b060

        result = <optimized out>

        client = 0x55c2372372d0

        nready = <optimized out>

        icheck = 0x55c2365fe6d0 <checkForInput>

        start_tick = 0

        currentDispatch = <optimized out>

#4  0x000055c2361b3821 in main (argc=15, argv=0x7ffe0df09938, envp=<optimized out>) at main.c:353

        i = <optimized out>

        xauthfile = <optimized out>

        alwaysCheckForInput = {0, 1}

Core dump uploaded to:

https://storm.cis.fordham.edu/~rkudyba/core.x2goagent.1201.e138540091ef4dfe9b48bf1d40960567.16202.1553606554000000

rpm -q nx-libs

nx-libs-3.5.99.19-0.0build1.0.git20190325.3293.heuler.fc29.x86_64

rpm -q x2goserver

x2goserver-4.1.0.4-0.0x2go1.0.git20190114.1758.heuler.fc29.x86_64

On Mar 26, 2019, at 5:13 AM, Mihai Moldovan <ionic@ionic.de> wrote:

* On 3/25/19 2:10 PM, Ulrich Sibiller wrote:
For testing you could try without ssh-agent or with the one of the current openssh.

Sure, that's the quickest workaround... I just switched to no-agent auth for
testing.

Naturally, though, I wasn't able to reproduce the problem with the current
master version. Everything was working fine as far as the keyboard was concerned.

It might be related to that commit, but I don't know. ctrl->num_groups is
obviously zero in XkbAdjustGroup()/xkbUtils.c, but I have no idea what that
actually means. The code in question does look a bit shady (for instance, it
checks for group >= ctrls->num_groups and later might set group %=
ctrls->num_groups, which obviously is a bad idea if both group and
ctrls->num_groups is zero, but I have the suspicion that that should never have
been the case in the first place.

I don't know what "groups" are in this context neither.

I somehow doubt that commit caused the problem, though. If the clone mechanism
works fine, that change shouldn't cause any problems. There's probably no harm
in cloning the config, even though we later sync up using xmodmap (other than a
race condition, i.e., there MIGHT be a problem if we first sync up using xmodmap
and then nxagent changes the whole keyboard settings again).

Seems to be yet another weird problem that can only be reproduced with user
accounts from NIS, but I have no idea why that might be. As far as I remember,
Roberts home directories are not even coming via NFS so the home dir should be
available at the time nxagent/x2goagent starts and - in that case - tries to
block keyboard file creation by making a directory. However,
nx-libs-3.5.99.18-0.0build1.0.git20190208.3237.heuler.fc29.x86_64 is quite old
and I recently synced the master branch up with Arctica Project's master branch
again, which means that it has 3.5.99.19 + the last two commits on top of it.
Maybe it's worthwhile to retest with that.

I'm wary of releasing 3.5.99.19 to X2Go land, though, since I did notice a
different problem in my test of an XFCE session on a Devuan Unstable machine:
for some reason I didn't have xfce4-terminal installed and the default terminal
application was set to qterminal. That started up, but only worked for a few
seconds, after which it froze up. x2goagent/nxagent used 100 % of one CPU thread
at that point and even after killing qterminal it continued to do so for a few
minutes, after which it settled down with occasional 100 % CPU spikes (but it
does that without having ever started qterminal, too, so I won't worry about it.
My machine's test CPU is a pretty bad one - Intel Atom 1.8 GHs).

Hopefully that's not a general problem with Qt5 applications?

Mihai