Bill -

I will try again with valgrind without --track-origins=yes and post any
interesting findings. Re ThreadSanitizer, we have tried before without
success. The last time we tried, it didn't work because clang TSAN
didn't support exceptions. Perhaps that has changed? We really like the
sanitizers (we run ASAN and UBSAN in our CI loop), but our experience
has been that there is a significant period of scrubbing out false
positives and adding suppressions before meaningful signal can be
extracted. I'm happy to add it to the list of things to try though.

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https://bugs.launchpad.net/bugs/1640518

Title:
  MongoDB Memory corruption

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