** Also affects: libx11 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1782984
Title:
PCManFM freezes with Assertion `!xcb_xlib_threads_sequence_lost'
failed when clicking on a file or folder in 18.04
Status in libx11 package in Ubuntu:
New
Status in pcmanfm package in Ubuntu:
Triaged
Bug description:
STEPS TO REPRODUCE
==================
The bug seems to occur when clicking on a file or folder. It is random and
difficult to provide clear steps to reproduce. It is, however, a common
situation.
EXPECTED RESULTS
================
pcmanfm works without problem.
ACTUAL RESULTS
==============
All pcmanfm windows become unresponsive, though background processes (e.g.
copying) may continue without problem. with the same error message in
~/.cache/lxsession/LXDE/run.log:
[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.
pcmanfm: xcb_io.c:259: poll_for_event: Assertion
`!xcb_xlib_threads_sequence_lost' failed.
** Message: 19:58:49.267: app.vala:130: pcmanfm exit with this type of exit: 6
** Message: 19:58:49.268: app.vala:148: Exit not normal, try to reload
(note the timestamp on the message will vary)
AFFECTED VERSIONS
=================
1.2.5-3ubuntu1
NOT 1.2.4-1ubuntu0.1
UPSTREAM BUG
============
https://sourceforge.net/p/pcmanfm/bugs/1089/
ADDITIONAL NOTES
================
Other GTK2 file managers (e.g. Thunar) and applications (e.g. GIMP, Leafpad)
seem to have the same problems. This is probably at least rooted in a GTK2 bug:
https://bugs.launchpad.net/ubuntu/+source/gtk+2.0/+bug/1808710
To further assert this, note that there is a SpaceFM file manager that
is available in GTK2 and GTK3. The GTK2 version displays the behavior.
The GTK3 version does not. Same with LibreOffice.
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