Fix test failure on test MW-86 and remove MW-360 test.
Merged from mysql-wsrep-bugs following: GCF-1058 MTR test galera.MW-86 fails on repeated runs Wait for the sync point sync.wsrep_apply_cb to be reached before executing the test and clearing the debug flag sync.wsrep_apply_cb. The race scenario: Intended behavior: node2: set sync.wsrep_apply_cb in order to start waiting in the background INSERT node1: INSERT start node2 (background): INSERT start node1: INSERT end node2: send signal to background INSERT: "stop waiting and continue executing" node2: clear sync.wsrep_apply_cb as no longer needed node2 (background): consume the signal node2 (background): INSERT end node2: DROP TABLE node2: check no pending signals are left - ok What happens occasionally (unexpected): node2: set sync.wsrep_apply_cb in order to start waiting in the background INSERT node1: INSERT start node2 (background): INSERT start node1: INSERT end // The background INSERT still has _not_ reached the place where it starts // waiting for the signal: // DBUG_EXECUTE_IF("sync.wsrep_apply_cb", "now wait_for..."); node2: send signal to background INSERT: "stop waiting and continue executing" node2: clear sync.wsrep_apply_cb as no longer needed // The background INSERT reaches DBUG_EXECUTE_IF("sync.wsrep_apply_cb", ...) // but sync.wsrep_apply_cb has already been cleared and the "wait" code is not // executed. The signal remains unconsumed. node2 (background): INSERT end node2: DROP TABLE node2: check no pending signals are left - failure, signal.wsrep_apply_cb is pending (not consumed) Remove MW-360 test case as it is not intended for MariaDB (uses MySQL GTID).
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