Unfortunately, I didn't save the actual log file that contained the exceptions. They were overwritten by subsequent invocations of xpra. I was able to copy the error from the terminal history buffer though. And I'm unable to reproduce the error, so I think this is a very uncommon code path. None the less, it does appear to be a bug as the error callbacks should be able to be called with no arguments. Here is the scraped log lines:
2017-02-13 14:32:21,947 Warning: xpra start from an existing 'ubuntu' desktop session 2017-02-13 14:32:21,948 pulseaudio forwarding may not work 2017-02-13 14:32:21,948 try using a clean environment, a dedicated user, 2017-02-13 14:32:21,948 or turn off pulseaudio X.Org X Server 1.18.4 Release Date: 2016-07-19 X Protocol Version 11, Revision 0 Build Operating System: Linux 4.4.0-45-generic x86_64 Ubuntu Current Operating System: Linux crass-Ideapad-Z570 4.9.0-15-generic #16-Ubuntu SMP Fri Jan 20 15:31:12 UTC 2017 x86_64 Kernel command line: BOOT_IMAGE=/@/boot/vmlinuz-4.9.0-15-generic.efi.signed root=/dev/mapper/vgsystem-system ro rootflags=subvol=@ quiet splash vt.handoff=7 Build Date: 02 November 2016 10:06:55PM xorg-server 2:1.18.4-1ubuntu6.1 (For technical support please see http://www.ubuntu.com/support) Current version of pixman: 0.33.6 Before reporting problems, check http://wiki.x.org to make sure that you have the latest version. Markers: (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown. (++) Log file: "/run/user/1000/xpra/Xorg.:100.log", Time: Mon Feb 13 14:32:21 2017 (++) Using config file: "/etc/xpra/xorg.conf" (==) Using system config directory "/usr/share/X11/xorg.conf.d" 2017-02-13 14:32:22,038 created unix domain socket: /home/crass/.xpra/crass-Ideapad-Z570-100 2017-02-13 14:32:22,038 Warning: cannot create socket '/var/run/xpra/crass-Ideapad-Z570-100' 2017-02-13 14:32:22,038 [Errno 13] Permission denied 2017-02-13 14:32:22,039 user 'crass' is a member of groups: adm, cdrom, sudo, dip, plugdev, lpadmin, sambashare, wireshark 2017-02-13 14:32:22,039 (missing 'xpra' group membership?) 2017-02-13 14:32:22,039 permissions on directory /var/run/xpra: 0770 2017-02-13 14:32:22,039 ownership root:xpra 2017-02-13 14:32:22,779 serving html content from: /usr/share/xpra/www 2017-02-13 14:32:22,873 pulseaudio server started with pid 14267 E: [pulseaudio] pid.c: Daemon already running. 2017-02-13 14:32:23,315 GStreamer version 1.8.3 for Python 2.7.12 64-bit 2017-02-13 14:32:23,327 Warning: cannot forward notifications, the interface is already claimed 2017-02-13 14:32:23,327 if you do not have a dedicated dbus session for this xpra instance, 2017-02-13 14:32:23,327 use the 'notifications=no' option ... <snip> ... 2017-02-13 14:32:23,335 started command 'gnome-terminal' with pid 14283 2017-02-13 14:32:23,336 xpra X11 version 1.0.3-r15051 64-bit 2017-02-13 14:32:23,336 uid=1000 (crass), gid=1000 (crass) 2017-02-13 14:32:23,336 running with pid 14212 on Linux Ubuntu 16.10 yakkety 2017-02-13 14:32:23,336 connected to X11 display :100 2017-02-13 14:32:23,349 xpra is ready. 2017-02-13 14:32:23,518 Introspect error on :1.5:/org/gnome/Terminal: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name :1.5 was not provided by any .service files 2017-02-13 14:32:23,518 Executing introspect queue due to error 2017-02-13 14:32:23,519 Introspect error on :1.5:/org/gnome/Terminal/window/1: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name :1.5 was not provided by any .service files 2017-02-13 14:32:23,519 Executing introspect queue due to error 2017-02-13 14:32:23,520 Introspect error on :1.5:/org/gnome/Terminal/menus/appmenu: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name :1.5 was not provided by any .service files 2017-02-13 14:32:23,520 Executing introspect queue due to error Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 607, in msg_reply_handler *message.get_args_list())) File "/usr/lib/python2.7/dist-packages/xpra/dbus/gtk_menuactions.py", line 323, in actions_error error_cb() TypeError: app_actions_err() takes exactly 1 argument (0 given) 2017-02-13 14:32:23,523 Error: failed to query org.gtk.Actions at /org/gnome/Terminal: 2017-02-13 14:32:23,523 (DBusException(dbus.String(u'The name :1.5 was not provided by any .service files'),),) Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 607, in msg_reply_handler *message.get_args_list())) File "/usr/lib/python2.7/dist-packages/xpra/dbus/gtk_menuactions.py", line 323, in actions_error error_cb() TypeError: window_actions_err() takes exactly 1 argument (0 given) 2017-02-13 14:32:23,523 Error: failed to query org.gtk.Actions at /org/gnome/Terminal/window/1: 2017-02-13 14:32:23,524 (DBusException(dbus.String(u'The name :1.5 was not provided by any .service files'),),) 2017-02-13 14:32:23,524 Error: failed to query org.gtk.Menus at /org/gnome/Terminal/menus/appmenu: 2017-02-13 14:32:23,524 (DBusException(dbus.String(u'The name :1.5 was not provided by any .service files'),),) 2017-02-13 14:32:23,529 child 'gnome-terminal' with pid 14283 has terminated 2017-02-13 14:32:23,529 all children have exited and --exit-with-children was specified, exiting 2017-02-13 14:32:24,032 xpra is terminating. 2017-02-13 14:32:24,033 closing TCP socket 127.0.0.2:10000 2017-02-13 14:32:24,033 killing xvfb with pid 14216 2017-02-13 14:32:24,033 removing socket /home/crass/.xpra/crass-Ideapad-Z570-100 (II) Server terminated successfully (0). Closing log file.
Thanks for the report, this should be fixed in r15057 (r15058 for v1.0.x branch) and will be in the next update.
I believe this can happen if we start to query the dbus interface whilst the application is shutting down. We should deal with it more gracefully now, only the "regular" warnings will remain.
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1437