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gh-122697: Fix free-threading memory leaks at shutdown (#122703)

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We were not properly accounting for interpreter memory leaks at
shutdown and had two sources of leaks:

 * Objects that use deferred reference counting and were reachable via
   static types outlive the final GC. We now disable deferred reference
   counting on all objects if we are calling the GC due to interpreter
   shutdown.

 * `_PyMem_FreeDelayed` did not properly check for interpreter shutdown
   so we had some memory blocks that were enqueued to be freed, but
   never actually freed.

 * `_PyType_FinalizeIdPool` wasn't called at interpreter shutdown.
This commit is contained in:
Sam Gross 2024-08-08 12:48:17 -04:00 • committed by GitHub
parent 833eb106f5
commit 2d9d3a9f53
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5 changed files with 27 additions and 4 deletions
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4
Python/pylifecycle.c
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@ -28,6 +28,7 @@
#include "pycore_sliceobject.h" // _PySlice_Fini()
#include "pycore_sysmodule.h" // _PySys_ClearAuditHooks()
#include "pycore_traceback.h" // _Py_DumpTracebackThreads()
#include "pycore_typeid.h" // _PyType_FinalizeIdPool()
#include "pycore_typeobject.h" // _PyTypes_InitTypes()
#include "pycore_typevarobject.h" // _Py_clear_generic_types()
#include "pycore_unicodeobject.h" // _PyUnicode_InitTypes()
@ -1832,6 +1833,9 @@ finalize_interp_types(PyInterpreterState *interp)
_PyTypes_FiniTypes(interp);
_PyTypes_Fini(interp);
#ifdef Py_GIL_DISABLED
_PyType_FinalizeIdPool(interp);
#endif
_PyCode_Fini(interp);