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Avoid unexpected panic in graceful manager (#29629)
There is a fundamental design problem of the "manager" and the "wait
group".
If nothing has started, the "Wait" just panics: sync: WaitGroup is
reused before previous Wait has returned
There is no clear solution besides a complete rewriting of the "manager"
If there are some mistakes in the app.ini, end users would just see the
"panic", but not the real error messages. A real case: #27643
This PR is just a quick fix for the annoying panic problem.
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