Hi, any news on this?
I have the same issue on Ubuntu 18.04.3 LTS.
I have upgraded from 16.04 recently and started to have this error.
This bug also affects leafpad and probably meld.
meld has a fix or workaround but can't remenber what was the fix, i had to 
install the latest meld from source, that fixed the problem.

I would like to hear if someone found any workaround or is it a bug on
libX11?

https://github.com/mirror/libX11/blob/master/src/xcb_io.c#L259

Looks like google chrome freezes from time to time in a very similar way
but could be a tone of things, just for the record.

What can i do to help?

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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

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