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Fri Sep 7 23:16:05 CEST 2007 · https://mail.python.org/pipermail/python-dev/2007-September/074481.html

I think there's a way to enable heavier malloc debugging than the
normal --with-pydebug. You'll have to enable it manually by editing
Python.h I believe. Though it may already be on if you define
Py_DEBUG. (Is WITH_PYMALLOC always on?) Ther may also be a libmalloc
that enables heavier debugging; the malloc man page would have info.

On 9/7/07, Bill Janssen <janssen at parc.com> wrote:
> I've been expanding the SSL test suite, and found something like this
> cropping up, not always, but maybe 30% of the time.  So I run it under
> gdb, but the "szone_error" breakpoint never gets hit.  Any other
> malloc debugging tips I should know about?
>
> (gdb) info break
> Num Type           Disp Enb Address    What
> 1   breakpoint     keep y   0x900f2e56 <szone_error+6>
> (gdb) (gdb) run ./Lib/test/regrtest.py -R :4: -u all test_ssl
> Starting program: /local/python/trunk/src/python.exe ./Lib/test/regrtest.py -R :4: -u all test_ssl
> test_ssl
> [...]
> python.exe(22696,0xa000d000) malloc: *** error for object 0x650800: double free
> python.exe(22696,0xa000d000) malloc: *** set a breakpoint in szone_error to debug
> test test_ssl failed -- Traceback (most recent call last):
>   File "/local/python/trunk/src/Lib/test/test_ssl.py", line 304, in testSSL3
>     CERTFILE2, CERTFILE3)
>   File "/local/python/trunk/src/Lib/test/test_ssl.py", line 203, in serverParamsTest
>     raise test_support.TestFailed("Unexpected SSL error:  " + str(x))
> TestFailed: Unexpected SSL error:  (8, '_ssl.c:394: EOF occurred in violation of protocol')
>
> 1 test failed:
>     test_ssl
> [23436 refs]
>
> Program exited with code 01.
> (gdb)
>
> Bill
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-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)

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[Python-Dev] any tips on malloc debugging?