"Failed to show the preferences dialog" - panel disappeared

sugarcube · September 3, 2022, 9:05am

Xfce4 panel disappeared at some point of yesterday. When I click “panel” from system tools it returns a following error.

"[Dom0] Error

Failed to to show the preferences dialog
GDBus.Error:org.freedesktop.DBus.Error.Serviceunkown: The name is not activatable"

Any way to get it back working? Thanks.

adw · September 3, 2022, 9:45am

I’m not sure if this does the same thing as the button you clicked, but you could try typing xfce4-panel & in a dom0 terminal.

fsflover · September 5, 2022, 1:37pm

And in order to open this terminal, you could hit alt+F3 and print “terminal”.

See also: Panel is gone and Taskbar invisible.

deeplow · September 6, 2022, 4:19pm

I didn’t try clicking there, but I’ve had it crash on my. So I opened an issue about it:

github.com/QubesOS/qubes-issues

xfce-panel crashes

opened 02:39PM - 29 Aug 22 UTC

deeplow

T: bug C: desktop-linux-xfce4 P: default needs diagnosis

### Qubes OS release R4.1 ### Brief summary After some use, the `xfce4-pa…nel` crashed. This is the second time in two weeks that this happens. Basically the top bar disappears. ### Steps to reproduce I don't know how to reproduce it. ### Expected behavior The panel would not randomly crash ### Actual behavior <details><summary>journalctl</summary> ``` Aug 29 15:08:10 dom0 pkexec[101107]: pam_unix(polkit-1:session): session opened for user root by (uid=1000) Aug 29 15:08:10 dom0 audit[101107]: USER_START pid=101107 uid=1000 auid=1000 ses=1 msg='op=PAM:session_open grantors=pam_keyinit,pam_limits,pam_systemd,pam_unix acct="root" exe="/usr/bin/pk> Aug 29 15:08:10 dom0 kernel: audit: type=1105 audit(1661782090.534:930): pid=101107 uid=1000 auid=1000 ses=1 msg='op=PAM:session_open grantors=pam_keyinit,pam_limits,pam_systemd,pam_unix ac> Aug 29 15:08:10 dom0 pkexec[101107]: user: Executing command [USER=root] [TTY=unknown] [CWD=/] [COMMAND=/usr/sbin/xfpm-power-backlight-helper --set-brightness 212] Aug 29 15:08:10 dom0 pkexec[101112]: pam_unix(polkit-1:session): session opened for user root by (uid=1000) Aug 29 15:08:10 dom0 kernel: audit: type=1105 audit(1661782090.693:931): pid=101112 uid=1000 auid=1000 ses=1 msg='op=PAM:session_open grantors=pam_keyinit,pam_limits,pam_systemd,pam_unix ac> Aug 29 15:08:10 dom0 audit[101112]: USER_START pid=101112 uid=1000 auid=1000 ses=1 msg='op=PAM:session_open grantors=pam_keyinit,pam_limits,pam_systemd,pam_unix acct="root" exe="/usr/bin/pk> Aug 29 15:08:10 dom0 pkexec[101112]: user: Executing command [USER=root] [TTY=unknown] [CWD=/] [COMMAND=/usr/sbin/xfpm-power-backlight-helper --set-brightness 106] Aug 29 15:08:10 dom0 pkexec[101117]: pam_unix(polkit-1:session): session opened for user root by (uid=1000) Aug 29 15:08:10 dom0 kernel: audit: type=1105 audit(1661782090.860:932): pid=101117 uid=1000 auid=1000 ses=1 msg='op=PAM:session_open grantors=pam_keyinit,pam_limits,pam_systemd,pam_unix ac> Aug 29 15:08:10 dom0 audit[101117]: USER_START pid=101117 uid=1000 auid=1000 ses=1 msg='op=PAM:session_open grantors=pam_keyinit,pam_limits,pam_systemd,pam_unix acct="root" exe="/usr/bin/pk> Aug 29 15:08:10 dom0 pkexec[101117]: user: Executing command [USER=root] [TTY=unknown] [CWD=/] [COMMAND=/usr/sbin/xfpm-power-backlight-helper --set-brightness 0] Aug 29 15:11:02 dom0 audit[7301]: ANOM_ABEND auid=1000 uid=1000 gid=1001 ses=1 pid=7301 comm="xfce4-panel" exe="/usr/bin/xfce4-panel" sig=6 res=1 Aug 29 15:11:02 dom0 kernel: audit: type=1701 audit(1661782262.469:933): auid=1000 uid=1000 gid=1001 ses=1 pid=7301 comm="xfce4-panel" exe="/usr/bin/xfce4-panel" sig=6 res=1 Aug 29 15:11:02 dom0 systemd[1]: Created slice system-systemd\x2dcoredump.slice. Aug 29 15:11:02 dom0 audit: BPF prog-id=44 op=LOAD Aug 29 15:11:02 dom0 audit: BPF prog-id=45 op=LOAD Aug 29 15:11:02 dom0 audit: BPF prog-id=46 op=LOAD Aug 29 15:11:02 dom0 kernel: audit: type=1334 audit(1661782262.513:934): prog-id=44 op=LOAD Aug 29 15:11:02 dom0 kernel: audit: type=1334 audit(1661782262.513:935): prog-id=45 op=LOAD Aug 29 15:11:02 dom0 kernel: audit: type=1334 audit(1661782262.513:936): prog-id=46 op=LOAD Aug 29 15:11:02 dom0 systemd[1]: Started Process Core Dump (PID 101135/UID 0). Aug 29 15:11:02 dom0 audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-coredump@0-101135-0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=?> Aug 29 15:11:02 dom0 kernel: audit: type=1130 audit(1661782262.517:937): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-coredump@0-101135-0 comm="systemd" exe="/usr/lib/system> Aug 29 15:11:02 dom0 systemd-coredump[101136]: Process 7301 (xfce4-panel) of user 1000 dumped core. Stack trace of thread 7301: #0 0x00007120b39cc7d5 raise (libc.so.6 + 0x3c7d5) #1 0x00007120b39b594d abort (libc.so.6 + 0x2594d) #2 0x00007120b39b5769 __assert_fail_base.cold (libc.so.6 + 0x25769) #3 0x00007120b39c4e86 __assert_fail (libc.so.6 + 0x34e86) #4 0x00007120b4b0f9f3 poll_for_event (libX11.so.6 + 0x469f3) #5 0x00007120b4b0fa9d poll_for_response (libX11.so.6 + 0x46a9d) #6 0x00007120b4b0fd9a _XEventsQueued (libX11.so.6 + 0x46d9a) #7 0x00007120b4b01681 XPending (libX11.so.6 + 0x38681) #8 0x00007120b421ca83 gdk_event_source_check (libgdk-3.so.0 + 0x72a83) #9 0x00007120b3cf14b9 g_main_context_check (libglib-2.0.so.0 + 0x524b9) #10 0x00007120b3cf1a55 g_main_context_iterate.constprop.0 (libglib-2.0.so.0 + 0x52a55) #11 0x00007120b3cf1e33 g_main_loop_run (libglib-2.0.so.0 + 0x52e33) #12 0x00007120b451199d gtk_main (libgtk-3.so.0 + 0x25c99d) #13 0x00005a9cf8f209c7 main (xfce4-panel + 0x179c7) #14 0x00007120b39b7082 __libc_start_main (libc.so.6 + 0x27082) #15 0x00005a9cf8f20f9e _start (xfce4-panel + 0x17f9e) Stack trace of thread 7304: #0 0x00007120b3a8686f __poll (libc.so.6 + 0xf686f) #1 0x00007120b3cf1aae g_main_context_iterate.constprop.0 (libglib-2.0.so.0 + 0x52aae) #2 0x00007120b3cf1be3 g_main_context_iteration (libglib-2.0.so.0 + 0x52be3) #3 0x00007120b3cf1c31 glib_worker_main (libglib-2.0.so.0 + 0x52c31) #4 0x00007120b3d1b7f2 g_thread_proxy (libglib-2.0.so.0 + 0x7c7f2) #5 0x00007120b3843432 start_thread (libpthread.so.0 + 0x9432) #6 0x00007120b3a916d3 __clone (libc.so.6 + 0x1016d3) Stack trace of thread 7306: #0 0x00007120b3a8686f __poll (libc.so.6 + 0xf686f) #1 0x00007120b3cf1aae g_main_context_iterate.constprop.0 (libglib-2.0.so.0 + 0x52aae) #2 0x00007120b3cf1e33 g_main_loop_run (libglib-2.0.so.0 + 0x52e33) #3 0x00007120b3f456aa gdbus_shared_thread_func (libgio-2.0.so.0 + 0x1226aa) #4 0x00007120b3d1b7f2 g_thread_proxy (libglib-2.0.so.0 + 0x7c7f2) #5 0x00007120b3843432 start_thread (libpthread.so.0 + 0x9432) #6 0x00007120b3a916d3 __clone (libc.so.6 + 0x1016d3) Aug 29 15:11:02 dom0 audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-coredump@0-101135-0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? > Aug 29 15:11:02 dom0 kernel: audit: type=1131 audit(1661782262.920:938): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-coredump@0-101135-0 comm="systemd" exe="/usr/lib/system> Aug 29 15:11:02 dom0 systemd[1]: systemd-coredump@0-101135-0.service: Succeeded. ``` </details> <details><summary>`~/.xsession-errors` (error at the bottom seems related)</summary> ``` qube-1: Starting GUI qube-1: Starting AUDIO qube-1: Sending monitor layout 2022-08-29 15:07:35,247 icon-receiver: connected: qube-1 Stream uncork Stream device alsa_output.pci-0000_00_1f.3.analog-stereo resumed.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo.monitor resumed.^[[K Stream started.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo resumed.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo resumed.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo.monitor resumed.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo resumed.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo.monitor resumed.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo resumed.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo.monitor resumed.^[[K Stream cork Stream device alsa_output.pci-0000_00_1f.3.analog-stereo suspended.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo.monitor suspended.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo suspended.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo.monitor suspended.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo suspended.^[[KStream device alsa_output.pci-0000_00_1f.3.analog-stereo suspended.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo.monitor suspended.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo suspended.^[[K Stream device alsa_output.pci-0000_00_1f.3.analog-stereo.monitor suspended.^[[K [xcb] Unknown sequence number while processing queue [xcb] Most likely this is a multi-threaded client and XInitThreads has not been called [xcb] Aborting, sorry about that. xfce4-panel: xcb_io.c:260: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed. ``` </details>

datalove · October 9, 2022, 10:08am

I regularly have the problem.

deeplow · October 10, 2022, 8:40am

Yes. It has been happening to me semi-regularly. See the aboved-linked github discussion.

enmus · October 13, 2022, 8:17pm

If you wanted to let the world know you had it too, it is OK, but it should probably go to General discussion then. Since you posted it in a support forum and expecting some help, then you should give us more info and what would be your question.