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Author martin.panter
Recipients Jeffrey.Walton, alex, alexandre.vassalotti, christian.heimes, deadshort, dmalcolm, donmez, fweimer, gregory.p.smith, jcea, jwilk, loewis, mark.dickinson, martin.panter, matejcik, nnorwitz, pitrou, python-dev, serhiy.storchaka, vstinner, xiang.zhang, ztane
Date 2016-07-24.00:10:29
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1469319029.58.0.453893802721.issue1621@psf.upfronthosting.co.za>
In-reply-to
Content 
The error message comes from Undefined Behaviour Sanitizer, which was added to newer versions of GCC and Clang. Currently I am compiling with

./configure --with-pydebug CC="gcc -fsanitize=undefined -fno-sanitize=alignment -fno-sanitize=shift"

https://gcc.gnu.org/onlinedocs/gcc/Instrumentation-Options.html#index-fsanitize_003dundefined-962

I thought it is worth adding a test for the impossible __length_hint__() value. Since the test iterator returns no elements, there will not be a MemoryError, but if overflow detection is enabled (such as UB Sanitizer or -ftrapv), it is guaranteed to exercise the overflow path and would be detected.
History
Date User Action Args
2016-07-24 00:10:29martin.pantersetrecipients: + martin.panter, loewis, nnorwitz, gregory.p.smith, jcea, mark.dickinson, pitrou, vstinner, christian.heimes, alexandre.vassalotti, donmez, matejcik, jwilk, alex, dmalcolm, python-dev, deadshort, serhiy.storchaka, ztane, fweimer, Jeffrey.Walton, xiang.zhang
2016-07-24 00:10:29martin.pantersetmessageid: <1469319029.58.0.453893802721.issue1621@psf.upfronthosting.co.za>
2016-07-24 00:10:29martin.panterlinkissue1621 messages
2016-07-24 00:10:29martin.pantercreate