[Python-Dev] segfault (double free?) when '''-string crosses line (original) (raw)

Neal Norwitz nnorwitz at gmail.com
Mon Apr 10 05:31:44 CEST 2006

On 4/9/06, Tim Peters <tim.peters at gmail.com> wrote:

[Guido] > On Linux, In HEAD 2.5, but only with the non-debug version, I get a > segfault when I do this: > > >>> ''' > ... '''

It rings a bell here only in that the front end had lots of allocate-versus-free mismatches between the PyObject and PyMem raw-memory APIs, and this kind of failure smells a lot like that.

http://python.org/sf/1467512 fixes the problem for me on linux. It converts all the PyMem_* APIs to PyObject_* APIs. Assigned to Guido until he changes that. :-)

There are several more places in the core that should probably use PyObject_* memory APIs since the alloced memory is small. 412 uses of PyMem_* in /.c. Most of those are in modules where it is probably appropriate. But PyFutureFeatures could really use PyObject_* given it's only 8 bytes. (Python/future.c and Python/compile.c).

Modules/_bsddb.c has a scary line: #define PyObject_Del PyMem_DEL

n

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