[BUG]: Updating to 3.0.1 causes TSS initialization error on Import

[kehoecj]

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What version (or hash if on master) of pybind11 are you using?

3.0.1

Problem description

We have a python library using Pybind11 2.x. When we tried to upgrade to Pybind11 3.x, we now receive the following error when importing:

ImportError: thread_specific_storage constructor: could not initialize the TSS key!

We are running Python 3.12.12 on UBI 9. The library is large and we're not sure where to start looking for the issue.

Reproducible example code

N/A

Is this a regression? Put the last known working version here if it is.

Not a regression

[kehoecj]

What are some areas to look at in the code that may trigger this error?

[FlorianDeconinck]

Seeing similar error, not when importing but during runtime after a significant amount of MODULES were created.

Medium confidence it's pybind11, we are tracking down the source now, but I figured I'd mention it.

python: 3.12.12
os: MacOS or Cray OS 3.1.0-28