Thank you for the bug report. It seems like a fix worth cherrypicking
but could you maybe give an example of impact the issue has which is
user visible? It would help especially for a stable update to have a
testcase to verify the fix and to justify the importance. If it's not
impacting anyone in a visible fashion then maybe it's not such an issue

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https://bugs.launchpad.net/bugs/1966334

Title:
  GLVND: Set current thread state to NULL in teardown

Status in libglvnd package in Ubuntu:
  Confirmed

Bug description:
  A new fix has been merged into the libglvnd repo at
  https://gitlab.freedesktop.org/glvnd/libglvnd

  This change fixes an issue where if eglReleaseThread gets externally called 
after the EGL destructor, a  double free occurs due to the threadState that 
eglReleaseThread checks is not null being not null despite being freed by the 
destuctor.
  The change makes the threadState null in the destructor to fix this.

  Can this make it into the libs in 20.04 LTS?

  Source package where the issue is encountered:
  https://launchpad.net/ubuntu/+source/libglvnd/1.3.2-1~ubuntu0.20.04.2

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