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

[White_Rabbit]

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)

[Kai Kasurinen (kai-kasurinen)]

downgrading libmysqlclient21:amd64 from 8.0.21-0ubuntu0.20.04.3 to 8.0.19-0ubuntu5 fixes issue

[David Cousens (davidcousens-u)]

Same downgrad also fixed a build of GnuCash 4.1 on 20.04 throwing the same error

[White_Rabbit (radiocane)]

Indeed, downgrading libmysqlclient21 is an effective workaround. Thanks :)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Marc Deslauriers (mdeslaur)]

I think this is related:

$ readelf --dynamic libmysqlclient.so.21.1.19 | grep BIND
 0x000000000000001e (FLAGS) BIND_NOW

$ readelf --dynamic libmysqlclient.so.21.1.21 | grep BIND
 0x000000000000001e (FLAGS) BIND_NOW STATIC_TLS

[Marc Deslauriers (mdeslaur)]

Possibly related:
https://github.com/mysql/mysql-server/commit/735bd2a53834266c7256830c8d34672ea55fe17b

[Marc Deslauriers (mdeslaur)]

I'm pretty sure this is a dupe of #1889851. Marking as such.

[Egej Vencelj (even-gits)]

I have the same issue while running python-qgis. I don't know how (or IF) it is related, but here's the log never the less:

even@even-ThinkPad-P53:~$ qgis --version
QGIS 3.14.1-Pi 'Pi' (de08d6b71d)
even@even-ThinkPad-P53:~$ python3 --version
Python 3.8.2
even@even-ThinkPad-P53:~$ python3
Python 3.8.2 (default, Jul 16 2020, 14:00:26)
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import qgis
>>> from qgis import core
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/qgis/core/__init__.py", line 25, in <module>
    from qgis._core import *
ImportError: /lib/x86_64-linux-gnu/libstdc++.so.6: cannot allocate memory in static TLS block
>>>

[Rouzaud Denis (denis-rouzaud)]

from this answer https://stackoverflow.com/a/62520135/1548052, this "solved" the issue for me:
LD_PRELOAD=/lib/x86_64-linux-gnu/libstdc++.so.6 python3 …