Bug #21602056 : CONCURRENT FLUSH PRIVILEGES + REVOKE/GRANT                 CRASHES IN WILD_CASE_COMPARE!
Bug #21602056 : CONCURRENT FLUSH PRIVILEGES + REVOKE/GRANT
                CRASHES IN WILD_CASE_COMPARE!

Description:- Executing FLUSH PRIVILEGES and REVOKE/
GRANT concurrently crashes the server.

Analysis:- Concurrent FLUSH PRIVILEGES and REVOKE/GRANT
might trigger a small time frame in which REVOKE/GRANT
fetches the "acl_proxy_user" information as a part of
"acl_check_proxy_grant_access()". Meanwhile FLUSH PRIVILEGES
deletes the old acl structures as a part of "acl_reload()".
After which REVOKE/GRANT tries to access the hostname in
"wild_case_compare()" which leads to a crash because of the
invalid memory access.

Fix:- Mutex lock on "acl_cache" is acquired before fetching
"acl_proxy_user" information in
"acl_check_proxy_grant_access()".

natsys/mariadb_10.2,natsys/mariadb_10.2,flynn1973/mariadb-aix,flynn1973/mariadb-aix,natsys/mariadb_10.2,flynn1973/mariadb-aix,ollie314/server,flynn1973/mariadb-aix,ollie314/server,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,ollie314/server,flynn1973/mariadb-aix,ollie314/server,ollie314/server,ollie314/server,ollie314/server,natsys/mariadb_10.2,ollie314/server,natsys/mariadb_10.2,flynn1973/mariadb-aix,natsys/mariadb_10.2,slanterns/server,flynn1973/mariadb-aix,ollie314/server,flynn1973/mariadb-aix,natsys/mariadb_10.2,flynn1973/mariadb-aix,flynn1973/mariadb-aix,ollie314/server,natsys/mariadb_10.2,flynn1973/mariadb-aix,ollie314/server