[3.7] bpo-9263: _PyObject_Dump() detects freed memory (GH-10061) #10662
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_PyObject_Dump() now uses an heuristic to check if the object memory has been freed: log "<freed object>" in that case. The heuristic rely on the debug hooks on Python memory allocators which fills the memory with DEADBYTE (0xDB) when memory is deallocated. Use PYTHONMALLOC=debug to always enable these debug hooks. (cherry picked from commit 82af0b6)
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Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.6. |
Contributor
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Sorry, @vstinner, I could not cleanly backport this to |
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GH-10663 is a backport of this pull request to the 3.6 branch. |
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…GH-10663) * bpo-9263: _PyObject_Dump() detects freed memory (GH-10061) _PyObject_Dump() now uses an heuristic to check if the object memory has been freed: log "<freed object>" in that case. The heuristic rely on the debug hooks on Python memory allocators which fills the memory with DEADBYTE (0xDB) when memory is deallocated. Use PYTHONMALLOC=debug to always enable these debug hooks. (cherry picked from commit 82af0b6) * bpo-9263: Fix _PyObject_Dump() for freed object (#10661) If _PyObject_Dump() detects that the object is freed, don't try to dump it (exit immediately). Enhance also _PyObject_IsFreed(): it now detects if the pointer itself looks like freed memory. (cherry picked from commit 2cf5d32) (cherry picked from commit 95036ea)
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https://bugs.python.org/issue9263