Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: libx11 (Ubuntu)
       Status: New => Confirmed

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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:
  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.

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