Author pitrou
Recipients Trundle, ncoghlan, neologix, pitrou, tim.peters
Date 2011-11-15.14:22:26
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In-reply-to <1321344699.51.0.923120188191.issue13390@psf.upfronthosting.co.za>
Content
> Valgrind does a much better job at this: it will also show you where
> the leaked blocks were allocated.
> OTOH, Valgrind is Linux-only and slow, but since I haven't used the
> '-R' option much, I don't know how usable this will be in practice
> (detecting memory leaks is one thing, identifying them is even
> better :-).

Yes, Valgrind is much more exhaustive and precise, but you have to build
Python --with-valgrind, to find the correct options to pass to Valgrind,
and also to parse the output. For example, OpenSSL seems to cause lots
of errors such as:

==20599== Conditional jump or move depends on uninitialised value(s)
==20599==    at 0xA2BB0B3: BN_div (in /usr/lib64/libcrypto.so.1.0.0)
==20599==    by 0xA2C125E: BN_nnmod (in /usr/lib64/libcrypto.so.1.0.0)
==20599==    by 0xA2C15CD: BN_mod_mul (in /usr/lib64/libcrypto.so.1.0.0)
==20599==    by 0xA2C37F0: BN_BLINDING_convert_ex
(in /usr/lib64/libcrypto.so.1.0.0)
==20599==    by 0xA2E15D6: ??? (in /usr/lib64/libcrypto.so.1.0.0)
==20599==    by 0x9FE6363: ssl3_get_client_key_exchange
(in /usr/lib64/libssl.so.1.0.0)
==20599==    by 0x9FE83A7: ssl3_accept (in /usr/lib64/libssl.so.1.0.0)
==20599==    by 0xF804190: PySSL_SSLdo_handshake (_ssl.c:390)
==20599==    by 0x47C0E9: PyEval_EvalFrameEx (ceval.c:3985)
==20599==    by 0x47CAC3: PyEval_EvalCodeEx (ceval.c:3376)
==20599==    by 0x47B3F1: PyEval_EvalFrameEx (ceval.c:4099)
==20599==    by 0x47C1DB: PyEval_EvalFrameEx (ceval.c:4089)

Right now this patch will allow to enrich the daily refleak runs (those
that send an e-mail to python-checkins). If someone finds a way to
sanitize Valgrind output, a daily Valgrind run would be cool as well.
History
Date User Action Args
2011-11-15 14:22:27pitrousetrecipients: + pitrou, tim.peters, ncoghlan, Trundle, neologix
2011-11-15 14:22:27pitroulinkissue13390 messages
2011-11-15 14:22:26pitroucreate