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gh-136870: fix data races in instrumentation of bytecode (#136994)

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De-instrumenting code objects modifies the thread local bytecode for all threads as such, holding the critical section on the code object is not sufficient and leads to data races. Now, the de-instrumentation is now performed under a stop the world pause as such no thread races with executing the thread local bytecode while it is being de-instrumented.
This commit is contained in:
Kumar Aditya 2025-07-24 23:28:46 +05:30 • committed by GitHub
parent 245671555b
commit 9a6b60af40
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2 changed files with 13 additions and 8 deletions
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1
Misc/NEWS.d/next/Core_and_Builtins/2025-07-24-17-30-58.gh-issue-136870.ncx82J.rst Normal file
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@ -0,0 +1 @@
Fix data races while de-instrumenting bytecode of code objects running concurrently in threads.

20
Python/instrumentation.c
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@ -1190,9 +1190,10 @@ call_instrumentation_vector(
break;
}
else {
LOCK_CODE(code);
PyInterpreterState *interp = tstate->interp;
_PyEval_StopTheWorld(interp);
remove_tools(code, offset, event, 1 << tool);
UNLOCK_CODE();
_PyEval_StartTheWorld(interp);
}
}
}
@ -1381,9 +1382,10 @@ _Py_call_instrumentation_line(PyThreadState *tstate, _PyInterpreterFrame* frame,
}
else {
/* DISABLE */
LOCK_CODE(code);
PyInterpreterState *interp = tstate->interp;
_PyEval_StopTheWorld(interp);
remove_line_tools(code, i, 1 << tool);
UNLOCK_CODE();
_PyEval_StartTheWorld(interp);
}
} while (tools);
Py_DECREF(line_obj);
@ -1438,9 +1440,10 @@ _Py_call_instrumentation_instruction(PyThreadState *tstate, _PyInterpreterFrame*
}
else {
/* DISABLE */
LOCK_CODE(code);
PyInterpreterState *interp = tstate->interp;
_PyEval_StopTheWorld(interp);
remove_per_instruction_tools(code, offset, 1 << tool);
UNLOCK_CODE();
_PyEval_StartTheWorld(interp);
}
}
Py_DECREF(offset_obj);
@ -2995,9 +2998,10 @@ branch_handler_vectorcall(
// Orphaned NOT_TAKEN -- Jump removed by the compiler
return res;
}
LOCK_CODE(code);
PyInterpreterState *interp = _PyInterpreterState_GET();
_PyEval_StopTheWorld(interp);
remove_tools(code, offset, other_event, 1 << self->tool_id);
UNLOCK_CODE();
_PyEval_StartTheWorld(interp);
}
return res;
}