Saving file in libreoffice crashes gnome-shell session

[Jean Hausser]

Hi!
I freshly installed Ubuntu 18.04.4 LTS on a new laptop two weeks ago.
Since then, I have been unable to save files in Libreoffice (version 1:6.0.7-0ubuntu0.18.04.10).

What I expected expected to happen:
When I click 'Save as' in the File menu of Libreoffice, a file dialog pops up where I can specify a filename to save the document in. Upon hitting ENTER, I expect the dialog to vanish and the file to be saved under that name.

What happened instead:
As soon as I hit ENTER, I get logged out of the gnome-shell session (back to the login screen). No file is saved. I just repeated the bug three times to confirm.

Debugging information:
According to the syslog data, saving the file causes gnome-shell to segfault (see event at 11:11:34 below). I'm including some context before and after the segfault to help with the debugging:

Mar 2 11:11:02 NHolgersson org.gnome.Shell.desktop[1457]: message repeated 2 times: [ libinput error: client bug: timer event21 debounce short: offset negative (-2ms)]
Mar 2 11:11:18 NHolgersson org.gnome.Nautilus[1427]: func=xmlSecCheckVersionExt:file=xmlsec.c:line=188:obj=unknown:subj=unknown:error=19:invalid version:mode=abi compatible;expected minor version=2;real minor version=2;expected subminor version=25;real subminor version=26
Mar 2 11:11:21 NHolgersson soffice.bin[22707]: GtkDialog mapped without a transient parent. This is discouraged.
Mar 2 11:11:21 NHolgersson dbus-daemon[884]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.719' (uid=1000 pid=22707 comm="/usr/lib/libreoffice/program/soffice.bin --writer " label="libreoffice-soffice (complain)")
Mar 2 11:11:21 NHolgersson kernel: [55178.608920] audit: type=1400 audit(1583143881.573:132): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/home/jean/Downloads/README" pid=22707 comm="pool" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
Mar 2 11:11:21 NHolgersson kernel: [55178.609164] audit: type=1400 audit(1583143881.573:133): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/home/jean/Downloads/README" pid=22707 comm="pool" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
Mar 2 11:11:21 NHolgersson kernel: [55178.609857] audit: type=1400 audit(1583143881.573:134): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name=2F686F6D652F6A65616E2F446F776E6C6F6164732F44656E207376656E736B6120626F73746164736D61726B6E6164656E20617072696C2032303138 pid=22707 comm="pool" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
Mar 2 11:11:21 NHolgersson systemd[1]: Starting Hostname Service...
Mar 2 11:11:21 NHolgersson kernel: [55178.609860] audit: type=1400 audit(1583143881.573:135): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name=2F686F6D652F6A65616E2F446F776E6C6F6164732F44656E207376656E736B6120626F73746164736D61726B6E6164656E20617072696C2032303138 pid=22707 comm="pool" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
Mar 2 11:11:21 NHolgersson kernel: [55178.609862] audit: type=1400 audit(1583143881.577:136): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/home/jean/Downloads/android-x86-9.0-rc2.iso" pid=22707 comm="pool" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
Mar 2 11:11:21 NHolgersson dbus-daemon[884]: [system] Successfully activated service 'org.freedesktop.hostname1'
Mar 2 11:11:21 NHolgersson systemd[1]: Started Hostname Service.
Mar 2 11:11:34 NHolgersson kernel: [55191.104967] show_signal_msg: 1 callbacks suppressed
Mar 2 11:11:34 NHolgersson kernel: [55191.104968] gnome-shell[1457]: segfault at 0 ip 00007f3bb0601f6f sp 00007ffe4701e160 error 4 in libgnome-shell.so[7f3bb05e5000+248000]
Mar 2 11:11:34 NHolgersson evolution[7204]: Error reading events from display: Broken pipe
Mar 2 11:11:34 NHolgersson soffice.bin[22707]: Error reading events from display: Connection reset by peer

[Jean Hausser (jhausser)]

Found connection to Bug #1497832 reported by Michael Gratton on 2015-09-21:
This bug only occurs when 'Use Libreoffice Dialogs' is ticked off in the general preferences.
Thus, it seems to be a GTK3 issue.