New submission from Mark Shannon <m...@hotpy.org>:

Running the buildbot for https://github.com/python/cpython/pull/26595
results in failures:
https://buildbot.python.org/all/#/builders/581/builds/63
Which claim that the address calculation in `LOAD_ATTR_MODULE` is out of bounds.

The tests pass with an added assert to verify that the address in question is 
in bounds. 

All failures seem to happen after a fork, which seems to be a longstanding 
weakness of the address sanitizer.

I'd like to merge https://github.com/python/cpython/pull/26595. I'd also like 
to keep the buildbots working. Dichotomy.

----------
messages: 395403
nosy: Mark.Shannon, pablogsal
priority: normal
severity: normal
status: open
title: Likely false positive for address sanitizer after fork

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44363>
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