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2019-09-02madvise: tolerate EINVAL and ENOSYSNick Mathewson
These errors can occur if we are built on a system with support for madvise(MADV_NOFORK) but then we are run on a system whose kernel does not support that flag. If the error is something that we don't tolerate at all, we now log it before crashing. Fixes bug 31570. I am calling this a bugfix on 0.4.1.1-alpha, where we actually started using the map_anon code.