root@bc6b29d0894d:/src/cpython# ./python -c $'import time;\nwhile True: time.sleep(1)' &
[1] 17106
root@bc6b29d0894d:/src/cpython# ./python -m pdb -p $!
OSError: [Errno 38] Function not implemented

The above exception was the direct cause of the following exception:

OSError: process_vm_readv failed for PID 17106 at address 0xaaaab1f8d038 (size 760, partial read 0 bytes): Function not implemented

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/src/cpython/Lib/runpy.py", line 198, in _run_module_as_main
    return _run_code(code, main_globals, None,
                     "__main__", mod_spec)
  File "/src/cpython/Lib/runpy.py", line 88, in _run_code
    exec(code, run_globals)
    ~~~~^^^^^^^^^^^^^^^^^^^
  File "/src/cpython/Lib/pdb.py", line 3609, in <module>
    pdb.main()
    ~~~~~~~~^^
  File "/src/cpython/Lib/pdb.py", line 3540, in main
    attach(opts.pid, opts.commands)
    ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/src/cpython/Lib/pdb.py", line 3424, in attach
    sys.remote_exec(pid, connect_script.name)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: Failed to read debug offsets structure from remote process

docker run -i --rm python:3.13 bash << 'EOF'  # the python version here is irrelevant, the image just has the right deps
newresolv=$(sed $'/nameserver/i\\\nnameserver 1.1.1.1' /etc/resolv.conf); echo "$newresolv" > /etc/resolv.conf  # resolv is wrong in my repro VM
mkdir src && cd src
git clone https://github.com/python/cpython.git --depth=10  # add --branch=3.14 to test 3.14
cd cpython
./configure --with-pydebug && make -j $(nproc)
./python -c $'import time;\nwhile True: time.sleep(1)' &
./python -m pdb -p $!
EOF