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(ITS#3932) regex/librewrite concurrency issue

Full_Name: Pierangelo Masarati
Version: HEAD/re23/re22
OS: Linux
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (
Submitted by: ando

There may be concurrent accesses to regex_t datum by librewrite; if regexec is
not thread safe (which I suppose is not) this may result in concurrency issues. 
I randomly experienced this with test039 on a 4 CPU machine; never experienced
it on single CPU machine.