Public bug reported:

libxcb 1.10 has serious bug which prevents multi-threaded OpenGL applications 
from working.
It crashes app with message like:
../../src/xcb_conn.c:186: write_vec: Assertion `!c->out.queue_len' failed.
It is described on:
http://lists.freedesktop.org/archives/xcb/2013-December/009027.html
Please release upgrade to 1.11 version which as far as I know fixed this issues 
for Ubuntu 15.04.

Kubuntu 15.04

libxcb1:
  Zainstalowana: 1.10-2ubuntu1
  KandydujÄ…ca:   1.10-2ubuntu1
  Tabela wersji:
 *** 1.10-2ubuntu1 0
        500 http://pl.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status

** Affects: libxcb (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1491043

Title:
  libxcb 1.10 has important bug fixed in 1.11

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