[Bug 192490] [build] race condition with multiple instances of cleandir in subdirectories; results in failure like "rm: fts_read: No such file or directory"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192490

Garrett Cooper <ngie at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|Issue Resolved              |In Discussion
         Resolution|FIXED                       |---

--- Comment #8 from Garrett Cooper <ngie at FreeBSD.org> ---
Reopening the bug because in retrospect the underlying issue has not been
resolved -- it has been worked around with r268376.

There are actually two bugs:
1. (Cause) rm -Rf is being run on a path and a subdirectory concurrently.
2. (Effect) rm -Rf is failing because fts_read isn't properly filtering out
certain errors like EACCES, ENOENT and EPERM.

imp@ resolved 2. (but there are other issues that were introduced with the
commit as it ignores all errors with fts_* according to the rm(1) manpage).
ian@ is looking into 1.

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