From 0adfa8482d369899e9963206a3307f423309e10c Mon Sep 17 00:00:00 2001 From: Brett Simmers Date: Mon, 4 Mar 2024 08:29:39 -0800 Subject: gh-115832: Fix instrumentation version mismatch during interpreter shutdown (#115856) A previous commit introduced a bug to `interpreter_clear()`: it set `interp->ceval.instrumentation_version` to 0, without making the corresponding change to `tstate->eval_breaker` (which holds a thread-local copy of the version). After this happens, Python code can still run due to object finalizers during a GC, and the version check in bytecodes.c will see a different result than the one in instrumentation.c causing an infinite loop. The fix itself is straightforward: clear `tstate->eval_breaker` when clearing `interp->ceval.instrumentation_version`. --- Lib/test/_test_monitoring_shutdown.py | 30 ++++++++++++++++++++++++++++++ Lib/test/test_monitoring.py | 12 +++++++++++- Python/instrumentation.c | 10 +++++++++- Python/pystate.c | 3 +++ 4 files changed, 53 insertions(+), 2 deletions(-) create mode 100644 Lib/test/_test_monitoring_shutdown.py diff --git a/Lib/test/_test_monitoring_shutdown.py b/Lib/test/_test_monitoring_shutdown.py new file mode 100644 index 0000000..3d0fbec --- /dev/null +++ b/Lib/test/_test_monitoring_shutdown.py @@ -0,0 +1,30 @@ +#!/usr/bin/env python3 + +# gh-115832: An object destructor running during the final GC of interpreter +# shutdown triggered an infinite loop in the instrumentation code. + +import sys + +class CallableCycle: + def __init__(self): + self._cycle = self + + def __del__(self): + pass + + def __call__(self, code, instruction_offset): + pass + +def tracefunc(frame, event, arg): + pass + +def main(): + tool_id = sys.monitoring.PROFILER_ID + event_id = sys.monitoring.events.PY_START + + sys.monitoring.use_tool_id(tool_id, "test profiler") + sys.monitoring.set_events(tool_id, event_id) + sys.monitoring.register_callback(tool_id, event_id, CallableCycle()) + +if __name__ == "__main__": + sys.exit(main()) diff --git a/Lib/test/test_monitoring.py b/Lib/test/test_monitoring.py index b027959..1e77eb6 100644 --- a/Lib/test/test_monitoring.py +++ b/Lib/test/test_monitoring.py @@ -9,7 +9,8 @@ import textwrap import types import unittest import asyncio -from test.support import requires_specialization +from test import support +from test.support import requires_specialization, script_helper PAIR = (0,1) @@ -1858,3 +1859,12 @@ class TestTier2Optimizer(CheckEvents): sys.monitoring.register_callback(TEST_TOOL, E.LINE, None) sys.monitoring.set_events(TEST_TOOL, 0) self.assertGreater(len(events), 250) + +class TestMonitoringAtShutdown(unittest.TestCase): + + def test_monitoring_live_at_shutdown(self): + # gh-115832: An object destructor running during the final GC of + # interpreter shutdown triggered an infinite loop in the + # instrumentation code. + script = support.findfile("_test_monitoring_shutdown.py") + script_helper.run_test_script(script) diff --git a/Python/instrumentation.c b/Python/instrumentation.c index 6f1bc2e..018cd66 100644 --- a/Python/instrumentation.c +++ b/Python/instrumentation.c @@ -891,8 +891,16 @@ static inline int most_significant_bit(uint8_t bits) { static uint32_t global_version(PyInterpreterState *interp) { - return (uint32_t)_Py_atomic_load_uintptr_relaxed( + uint32_t version = (uint32_t)_Py_atomic_load_uintptr_relaxed( &interp->ceval.instrumentation_version); +#ifdef Py_DEBUG + PyThreadState *tstate = _PyThreadState_GET(); + uint32_t thread_version = + (uint32_t)(_Py_atomic_load_uintptr_relaxed(&tstate->eval_breaker) & + ~_PY_EVAL_EVENTS_MASK); + assert(thread_version == version); +#endif + return version; } /* Atomically set the given version in the given location, without touching diff --git a/Python/pystate.c b/Python/pystate.c index a370fff..3d6394f 100644 --- a/Python/pystate.c +++ b/Python/pystate.c @@ -795,7 +795,10 @@ interpreter_clear(PyInterpreterState *interp, PyThreadState *tstate) Py_CLEAR(interp->audit_hooks); + // At this time, all the threads should be cleared so we don't need atomic + // operations for instrumentation_version or eval_breaker. interp->ceval.instrumentation_version = 0; + tstate->eval_breaker = 0; for (int i = 0; i < _PY_MONITORING_UNGROUPED_EVENTS; i++) { interp->monitors.tools[i] = 0; -- cgit v0.12 e='bug_2cf3d6942c'>bug_2cf3d6942c Tk is a free and open-source, cross-platform widget toolkit that provides a library of basic elements of GUI widgets for building a graphical user interface (GUI) in many programming languages.
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