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gh-120158: Fix inconsistent monitoring state when setting events too frequently (gh-141845)

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If we overflowed the global version counter (i.e., after 2*24 calls to
`_PyMonitoring_SetEvents`), we bailed out after setting global monitoring
events but before instrumenting code objects, which led to assertion errors
later on.

Also add a `time.sleep()` to `test_free_threading.test_monitoring` to avoid
overflowing the global version counter.
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Sam Gross 2025-11-23 10:07:17 -05:00 • committed by GitHub
parent 614a28b3da
commit e457d60daa
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3 changed files with 6 additions and 1 deletions
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3
Lib/test/test_free_threading/test_monitoring.py
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@ -73,6 +73,9 @@ def test_instrumentation(self):
break
self.during_threads()
# Sleep to avoid setting monitoring events too rapidly and
# overflowing the global version counter
time.sleep(0.0001)
self.after_test()

2
Misc/NEWS.d/next/Core_and_Builtins/2025-11-22-10-43-26.gh-issue-120158.41_rXd.rst Normal file
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@ -0,0 +1,2 @@
Fix inconsistent state when enabling or disabling monitoring events too many
times.

2
Python/instrumentation.c
View file

@ -2021,12 +2021,12 @@ _PyMonitoring_SetEvents(int tool_id, _PyMonitoringEventSet events)
if (existing_events == events) {
return 0;
}
set_events(&interp->monitors, tool_id, events);
uint32_t new_version = global_version(interp) + MONITORING_VERSION_INCREMENT;
if (new_version == 0) {
PyErr_Format(PyExc_OverflowError, "events set too many times");
return -1;
}
set_events(&interp->monitors, tool_id, events);
set_global_version(tstate, new_version);
#ifdef _Py_TIER2
_Py_Executors_InvalidateAll(interp, 1);