[Bug 1782984] Re: Assertion `!xcb_xlib_threads_sequence_lost' failed with multiple applications

[Ubuntu Foundations Team Bug Bot]

The attachment "This patch is not the fix. WARNING" seems to be a patch.
If it isn't, please remove the "patch" flag from the attachment, remove
the "patch" tag, and if you are a member of the ~ubuntu-reviewers,
unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by
~brian-murray, for any issues please contact him.]

** Tags added: patch

-- 
You received this bug notification because you are a member of Ubuntu
Sponsors Team, which is subscribed to a duplicate bug report (1754084).
https://bugs.launchpad.net/bugs/1782984

Title:
  Assertion `!xcb_xlib_threads_sequence_lost' failed with multiple
  applications

Status in libx11 package in Ubuntu:
  Confirmed
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libx11/+bug/1782984/+subscriptions