[Python-Dev] tp_dealloc (original) (raw)

Nick Coghlan ncoghlan at gmail.com
Wed Jun 2 14:33:19 CEST 2010

On 01/06/10 22:21, smarv at gmx.net wrote:

This said, there may be a bug somewhere, but what do you want us to look at? Do you have a case that we could reproduce and investigate?

-- Amaury Forgeot d'Arc Thank you, I'm not a C-Developer, but still I have one more detail: I call pydecRef( pyObj) of dll (version 3.1.1), ( which calls tpdealloc, which calls my freeMem() method)) No problem is reported here.

As Amaury has pointed out, there are a number of ways this could be bug in your extension module, or some other CPython extension you are using (most obviously, a Py_DECREF without a corresponding Py_INCREF, but there are probably other more exotic ways to manage it).

If you corrupt the reference count for a module global variable with an extra Py_DECREF call, then you may get an access violation at interpreter shutdown (i.e. in response to a Py_Finalize call) as the destruction of the module attempts to decrement the reference count of an object that was incorrectly deleted while it was still referenced.

Since the symptoms you have described so far exactly match the expected symptoms of a reference counting bug which may not have anything whatsoever to do with the interpreter core or the standard library, you're going to need a much better defined test case (written in C or Python) to convince us that our code is the problem.

Regards, Nick.

-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia

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