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Add coredump test for deep python stacks
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‎tools/coredump/testdata/amd64/deep-python-call.json‎

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{
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"coredump-ref": "79a46c0367a921375076930fe211405a635c0985d1f631102d3dfeda7652d8a3",
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"threads": [
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{
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"lwp": 1236391,
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}

‎tools/coredump/testsources/python/deep_call.py‎

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#!/usr/bin/env python3
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"""Generate a deep Python call stack with interleaved Python/C frames.
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Each Python function call goes through CPython's C eval loop
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(_PyFunction_Vectorcall → _PyEval_Vector → _PyEval_EvalFrame →
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_PyEval_EvalFrameDefault → do_call_core), creating ~5 native frames
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between every Python frame. With 20 class.__call__ levels, this
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produces ~100 native frames interleaved with ~20 Python frames,
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requiring ~40 Python↔native unwinder transitions.
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On main (tail-call design), this exceeds the 29 tail call limit and
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truncates the stack. With the combined Python+native loop, the full
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stack is unwound.
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"""
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import os
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import signal
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import traceback
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class Level:
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"""Each subclass's __call__ invokes the next level via slot_tp_call."""
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pass
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# Generate 20 levels of classes that chain-call each other.
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# Each __call__ goes through CPython's slot_tp_call (C) which creates
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# native frames between the Python frames.
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NUM_LEVELS = 20
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def _make_levels():
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levels = []
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for i in range(NUM_LEVELS):
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levels.append(type(f'Level{i}', (Level,), {}))
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# Wire up: each level's __call__ invokes the next level
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for i in range(NUM_LEVELS - 1):
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next_cls = levels[i + 1]
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# Use a closure to capture next_cls
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def make_call(nxt):
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def __call__(self):
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return nxt()()
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return __call__
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levels[i].__call__ = make_call(next_cls)
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# Last level: print the stack and hang so we can capture a coredump
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def last_call(self):
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print(f"Reached level {NUM_LEVELS - 1}, PID={os.getpid()}", flush=True)
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print("Stack trace:", flush=True)
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traceback.print_stack()
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print(f"\nWaiting for coredump (kill -ILL {os.getpid()})...", flush=True)
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signal.pause()
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levels[-1].__call__ = last_call
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return levels
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def main():
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levels = _make_levels()
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levels[0]()()
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if __name__ == '__main__':
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main()

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