Christian Heimes <[email protected]> added the comment:
The problem is in PyImport_ImportFrozenModuleObject -> unmarshal_frozen_code()
-> frozen_info.get_code() -> _Py_get_importlib__bootstrap_external_toplevel()
call chain.
PyImport_ImportFrozenModuleObject() expects unmarshal_frozen_code() to return a
strong reference to the code object. However a frozen_info struct with a
get_code() function returns a borrowed reference from deepfreeze.c's toplevel
code object.
# --- test.c
#include <Python.h>
int main(int argc, char *argv[])
{
for (int i=1; i <= 100; i++) {
Py_SetProgramName(L"./_testembed");
Py_Initialize();
Py_Finalize();
printf("Loop #%d: %zd refs, bootstrap refs: %zd\n", i, _Py_RefTotal,
Py_REFCNT(_Py_get_importlib__bootstrap_external_toplevel()));
}
}
# ---
$ gcc -IInclude -I. -o test test.c libpython3.11d.a -lm && ./test
Loop #1: -3 refs, bootstrap refs: 999999998
Loop #2: -8 refs, bootstrap refs: 999999997
Loop #3: -13 refs, bootstrap refs: 999999996
Loop #4: -18 refs, bootstrap refs: 999999995
Loop #5: -23 refs, bootstrap refs: 999999994
Loop #6: -28 refs, bootstrap refs: 999999993
Loop #7: -33 refs, bootstrap refs: 999999992
Loop #8: -38 refs, bootstrap refs: 999999991
Loop #9: -43 refs, bootstrap refs: 999999990
Loop #10: -48 refs, bootstrap refs: 999999989
After I changed unmarshal_frozen_code() to "return Py_NewRef(code);", the
reference count of the frozen bootstrap module stays stable, but total refcount
increases over time:
Loop #1: 10 refs, bootstrap refs: 999999999
Loop #2: 18 refs, bootstrap refs: 999999999
Loop #3: 26 refs, bootstrap refs: 999999999
Loop #4: 34 refs, bootstrap refs: 999999999
Loop #5: 42 refs, bootstrap refs: 999999999
Loop #6: 50 refs, bootstrap refs: 999999999
Loop #7: 58 refs, bootstrap refs: 999999999
Loop #8: 66 refs, bootstrap refs: 999999999
Loop #9: 74 refs, bootstrap refs: 999999999
----------
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Python tracker <[email protected]>
<https://bugs.python.org/issue46449>
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