Chun-Hung Hsiao created MESOS-9098:
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Summary: `os::clone` returns `Failed to clone: Success` on error.
Key: MESOS-9098
URL: https://issues.apache.org/jira/browse/MESOS-9098
Project: Mesos
Issue Type: Improvement
Components: stout
Affects Versions: 1.7.0
Reporter: Chun-Hung Hsiao
{{os::clone}} in stout is implemented in a way that when {{::clone}} fails, it
would call {{::munmap}} to free the allocated stack memory, which would
overwrite {{errno}}, causing it to return an {{Failed to clone: Success}} error:
[https://github.com/apache/mesos/blob/master/3rdparty/stout/include/stout/os/linux.hpp#L165]
We should preserve {{errno}} before calling {{::munmap}}, and return
{{::munmap}}'s {{errno}} only if {{::clone}}'s {{errno}} is not zero.
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