GH-99205: Mark new interpreters and threads as non-static (GH-99268)

1 files changed, 8 insertions, 0 deletions

diff --git a/Python/pystate.c b/Python/pystate.c
index dd6d6e9..df0f4e2 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -356,6 +356,7 @@ PyInterpreterState_New(void)
         interp = &runtime->_main_interpreter;
         assert(interp->id == 0);
         assert(interp->next == NULL);
+        assert(interp->_static);
 
         interpreters->main = interp;
     }
@@ -370,6 +371,9 @@ PyInterpreterState_New(void)
         // Set to _PyInterpreterState_INIT.
         memcpy(interp, &initial._main_interpreter,
                sizeof(*interp));
+        // We need to adjust any fields that are different from the initial
+        // interpreter (as defined in _PyInterpreterState_INIT):
+        interp->_static = false;
 
         if (id < 0) {
             /* overflow or Py_Initialize() not called yet! */
@@ -837,6 +841,7 @@ new_threadstate(PyInterpreterState *interp)
         assert(id == 1);
         used_newtstate = 0;
         tstate = &interp->_initial_thread;
+        assert(tstate->_static);
     }
     else {
         // Every valid interpreter must have at least one thread.
@@ -848,6 +853,9 @@ new_threadstate(PyInterpreterState *interp)
         memcpy(tstate,
                &initial._main_interpreter._initial_thread,
                sizeof(*tstate));
+        // We need to adjust any fields that are different from the initial
+        // thread (as defined in _PyThreadState_INIT):
+        tstate->_static = false;
     }
     interp->threads.head = tstate;