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Here's a patch with a unittest that reproduces the problem with fixes to stop using any end_fds. The max fd is only ever used in the absolute fallback situation where no way to get a list of open fd's is available. In that case it is obtained from sysconf() at the time it is needed rather than module load time as sysconf() is async-signal-safe.
I'm not worried about calling close() an additional time on EINTR in the single threaded child process prior to exec(). The most that will happen is one extra call with a different error if the fd is in a bad state from the previous one. That is better than any chance of one being left open.