[POSSIBLE BUG] t5562.08 hangs consistently in 2.28.0 when run via Jenkins

["Randall S. Becker" <rsbecker@nexbridge.com>]

I have been working through figuring out why we are getting a consistent
hang on t5562.08  for 2.28.0 on the NonStop TNS/X platform (x86 big endian).
This did not happen in the -rc series changes and appears transient. My
investigation into this did not turn up anything useful other than the
circumstances.

When run from a shell, the test consistently passes regardless of options
used. Then only time this hangs is when we run through the git test suite
through Jenkins – so there is no valid input tty. Even redirecting stdin to
/dev/null does not cause an issue.

I am suspecting something in the test suite rather than git itself. We have
had similar issues with t5526 in the past – 2.20 timeframe as I recall.
Interrupting git-http-backend unwound the test and allowed us to continue
with the pipeline but I have no evidence of anything wrong there.

This will not stop our release of the NonStop builds of 2.28.0 since the
test passes in isolation. Curiously, this does not have an issue on the
TNS/E platform (itanium big endian) where we have seen more issues
historically.

Kind Regards,
Randall

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