Hi, I was made aware of crashes in the last lxml release, which turned out to be due to the use of freelists for types that could be subtyped from Python code. I was able to work around them in lxml, however, the real problem is in Cython. There was supposed to be a safe guard for that case in the freelist code based on the object struct size, which increases for subtypes that have a __dict__. However, if the Python subtype uses an empty __slots__ declaration, the object struct size will not increase, thus passing the guard.
The correct fix is to also test if the type being instantiated lives on the heap and exclude it from the freelist if so. https://github.com/cython/cython/commit/d2aff824dd0900982a420ebaaa1dac6120a9d72e This, together with the buffer/memory view related bugs I fixed since the last release, suggest (at least to me) that we shouldn't wait all too long with the next bug fix release. >From my POV, all changes in current master are safe enough to go out. Stefan _______________________________________________ cython-devel mailing list cython-devel@python.org https://mail.python.org/mailman/listinfo/cython-devel
