I am using ubuntu 18.04 in docker environment and running swtbot tests using 
eclipse. I get the same error.
I updated my docker file to install libx11-6 but the problem still exists. The 
tests execution is aborted with the following error message

[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.
java: ../../src/xcb_io.c:259: poll_for_event: Assertion 
`!xcb_xlib_threads_sequence_lost' failed.

Is there any fix/workaround available for this bug?

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https://bugs.launchpad.net/bugs/1782984

Title:
  Assertion `!xcb_xlib_threads_sequence_lost' failed with multiple
  applications

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