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(ITS#6954) pcache crashes when bind-caching is enable

Full_Name: Ralf Haferkamp
Version: 2.4.25/HEAD
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (
Submitted by: ralf

The pcache overlay can crash slapd when bind-caching ("pcacheBind" in
slapd.conf) is enabled. It turned out to be a race condition with the
consistency checker background task. The task might free and (expired) cached
query while it is still being referenced by a bind operation currently in
progress. Fix is coming.