[Bug 1890170] [NEW] ImportError libstdc++.so.6 cannot allocate memory after importing PyQt5.Qt PyQt5.QtCore and cv2

[White_Rabbit]

Public bug reported:

I'm using an updated Lubuntu focal. Starting maybe last week (monday July 27th), if in python3 I do
from PyQt5 import Qt, QtCore
import cv2

I get
ImportError: /lib/x86_64-linux-gnu/libstdc++.so.6: cannot allocate memory in static TLS block

I noticed only now that the reverse (first import cv2, then Qt, QtCore)
seems to work correctly and displays no errors. I'm afraid I might not
be able to do the reverse in my real software...

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: python3 3.8.2-0ubuntu2
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: LXQt
Date: Mon Aug  3 17:49:20 2020
InstallationDate: Installed on 2020-07-15 (19 days ago)
InstallationMedia: Lubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: python3-defaults
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: python3-defaults (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1890170

Title:
  ImportError libstdc++.so.6 cannot allocate memory after importing
  PyQt5.Qt PyQt5.QtCore and cv2

Status in python3-defaults package in Ubuntu:
  New

Bug description:
  I'm using an updated Lubuntu focal. Starting maybe last week (monday July 27th), if in python3 I do
  from PyQt5 import Qt, QtCore
  import cv2

  I get
  ImportError: /lib/x86_64-linux-gnu/libstdc++.so.6: cannot allocate memory in static TLS block

  I noticed only now that the reverse (first import cv2, then Qt,
  QtCore) seems to work correctly and displays no errors. I'm afraid I
  might not be able to do the reverse in my real software...

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: python3 3.8.2-0ubuntu2
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.4
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: LXQt
  Date: Mon Aug  3 17:49:20 2020
  InstallationDate: Installed on 2020-07-15 (19 days ago)
  InstallationMedia: Lubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: python3-defaults
  UpgradeStatus: No upgrade log present (probably fresh install)

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