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()".
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