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gh-128717: Stop-the-world when setting the recursion limit (#128741)

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Peter Bierma 2025-01-12 08:04:30 -05:00 • committed by GitHub
parent ff39e3ff7b
commit f6c61bf2d7
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3 changed files with 19 additions and 0 deletions
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15
Lib/test/test_free_threading/test_races.py
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@ -270,6 +270,21 @@ class TestRaces(TestBase):
do_race(set_value, mutate)
def test_racing_recursion_limit(self):
def something_recursive():
def count(n):
if n > 0:
return count(n - 1) + 1
return 0
count(50)
def set_recursion_limit():
for limit in range(100, 200):
sys.setrecursionlimit(limit)
do_race(something_recursive, set_recursion_limit)
if __name__ == "__main__":
unittest.main()

2
Misc/NEWS.d/next/Core_and_Builtins/2025-01-11-12-39-17.gh-issue-128717.i65d06.rst Normal file
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@ -0,0 +1,2 @@
Fix a crash when setting the recursion limit while other threads are active
on the :term:`free threaded <free threading>` build.

2
Python/ceval.c
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@ -294,6 +294,7 @@ void
Py_SetRecursionLimit(int new_limit)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
_PyEval_StopTheWorld(interp);
interp->ceval.recursion_limit = new_limit;
_Py_FOR_EACH_TSTATE_BEGIN(interp, p) {
int depth = p->py_recursion_limit - p->py_recursion_remaining;
@ -301,6 +302,7 @@ Py_SetRecursionLimit(int new_limit)
p->py_recursion_remaining = new_limit - depth;
}
_Py_FOR_EACH_TSTATE_END(interp);
_PyEval_StartTheWorld(interp);
}
/* The function _Py_EnterRecursiveCallTstate() only calls _Py_CheckRecursiveCall()