[Python bindings] Python interpreter restarts (?) after first import of python_crun

[rijenkii]

Checked python versions -- 3.9.5, 3.8.6, 3.6.8.
Steps to reproduce:

git clone https://github.com/containers/crun
cd crun
python3 -m venv --copies --without-pip venv
./autogen.sh
./configure --prefix=$(readlink -f venv) --enable-shared --with-python-bindings
make install

cat <<EOF > test.py
import os
print(f"First,  {os.getpid() = }")
import python_crun
print(f"Second, {os.getpid() = }")
EOF
venv/bin/python test.py

Expected output:

First,  os.getpid() = 324613
Second, os.getpid() = 324613

Actual output:

First,  os.getpid() = 324613
First,  os.getpid() = 324613
Second, os.getpid() = 324613

[giuseppe]

It is a side effect of https://github.com/containers/crun/blob/main/src/libcrun/linux.c#L3881-L3891

It is required to avoid attacks like https://nvd.nist.gov/vuln/detail/CVE-2019-5736

[rijenkii]

So, not a bug, understood.
If I run into problems with this I will open a new issue, thanks.