signal.signal() not triggering when using --onefile, and signal is being sent by kill

When signal.signal() is used in a program to register a signal handler and --onefile to compile, the signal handler does not get called when the program gets signaled by kill command. It does work in --standalone.

This bug is a possible duplicate of https://github.com/Nuitka/Nuitka/issues/2156 , however, the behavior I am getting is different than the behavior in that ticket.

Reproduction steps

create signal_debug.py test program:

# ./signal_debug.py
import signal
import sys
import time
from types import FrameType
from typing import Optional

def handle_signal(signal: int, frame: Optional[FrameType]):
    print(f"\n{signal} signal handled", flush=True)
    sys.exit(0)

signal.signal(signal.SIGINT, handle_signal)

while True:
    print(".", end="", flush=True)
    time.sleep(0.35)

create ./test.sh script:

#!/bin/bash
# ./test.sh
python3.11 -m venv .venv
./.venv/bin/python3 -m pip install nuitka==1.8.4
#./.venv/bin/python3 -m pip install Nuitka-develop.zip
./.venv/bin/python3 -m nuitka --version
./.venv/bin/python3 -m pip freeze
## show standalone execution
# compile
./.venv/bin/python3 -m nuitka --standalone signal_debug.py
# test binary
echo "Starting signal_debug.dist/signal_debug.bin"
./signal_debug.dist/signal_debug.bin &
SIGNAL_DEBUG_PID=$!
sleep 1
kill -s SIGINT $SIGNAL_DEBUG_PID
echo "kill -s SIGINT $SIGNAL_DEBUG_PID sent"
wait $SIGNAL_DEBUG_PID
echo "./signal_debug.dist/signal_debug.bin exited."
## show onefile execution
# compile
./.venv/bin/python3 -m nuitka --onefile signal_debug.py
# test binary
echo "Starting signal_debug.bin"
./signal_debug.bin &
SIGNAL_DEBUG_PID=$!
sleep 1
kill -s SIGINT $SIGNAL_DEBUG_PID
echo "kill -s SIGINT $SIGNAL_DEBUG_PID sent"
## does behavior change the second time?
#sleep 1
#kill -s SIGINT $SIGNAL_DEBUG_PID
#echo "kill -s SIGINT $SIGNAL_DEBUG_PID sent"
wait $SIGNAL_DEBUG_PID
echo "./signal_debug.bin exited."

standalone output

Starting signal_debug.dist/signal_debug.bin
...kill -s SIGINT 3419343 sent

2 signal handled
./signal_debug.dist/signal_debug.bin exited.

onefile output

Starting signal_debug.bin
...kill -s SIGINT 3419661 sent
.............../signal_debug.bin exited.

Environment Information

./.venv/bin/python3 -m nuitka --version

1.9rc5
Commercial: None
Python: 3.11.4 (main, Jun 13 2023, 16:07:53) [GCC 8.5.0 20210514 (Red Hat 8.5.0-16)]
Flavor: Unknown
Executable: /home/<redacted>/scratchpad/signal-reproducer/.venv/bin/python3
OS: Linux
Arch: x86_64
Distribution: Rhel (based on Fedora) 8.7
Version C compiler: /usr/bin/gcc (gcc).

installation method

python3.11 -m venv .venv
#./.venv/bin/python3 -m pip install nuitka==1.8.4
./.venv/bin/python3 -m pip install Nuitka-develop.zip

./.venv/bin/python3 -m pip freeze

Nuitka==1.8.4
ordered-set==4.1.0
zstandard==0.21.0

Additional testing

• behavior is same in 1.8.4 and develop branch (1.9rc5)
• behavior also occurs when using asyncio.get_event_loop().add_signal_handler(signal.SIGINT, ...)
• sending multiple SIGINT's does not help
• ctrl-c on the command line DOES work:

   ./signal_debug.bin
   ....^C
   2 signal handled
  

• behavior is same when using --onefile-child-grace-time=20000, but more dots appear before the program exits

  Starting signal_debug.bin
  ...kill -s SIGINT 3424398 sent
  ........................................................../signal_debug.bin exited.