FYI the QEMU change merged in the following pull request changed to
return an EPERM errno for the thread affinity syscalls:

commit 12f067cc14b90aef60b2b7d03e1df74cc50a0459
Merge: 84bdc58c06 035121d23a
Author: Peter Maydell <peter.mayd...@linaro.org>
Date:   Thu Mar 28 12:04:52 2019 +0000

    Merge remote-tracking branch 'remotes/otubo/tags/pull-seccomp-20190327' 
into staging
    
    pull-seccomp-20190327
    
    # gpg: Signature made Wed 27 Mar 2019 12:12:39 GMT
    # gpg:                using RSA key DF32E7C0F0FFF9A2
    # gpg: Good signature from "Eduardo Otubo (Senior Software Engineer) 
<ot...@redhat.com>" [full]
    # Primary key fingerprint: D67E 1B50 9374 86B4 0723  DBAB DF32 E7C0 F0FF 
F9A2
    
    * remotes/otubo/tags/pull-seccomp-20190327:
      seccomp: report more useful errors from seccomp
      seccomp: don't kill process for resource control syscalls
    
    Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>

IOW, mesa's usage of this syscalls will still be blocked, but it will no
longer kill the process.

** Changed in: qemu
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1815889

Title:
  qemu-system-x86_64 crashed with signal 31 in
  __pthread_setaffinity_new()

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