--source include/not_embedded.inc
--source include/have_debug_sync.inc
--source include/have_binlog_format_mixed_or_statement.inc
--source include/master-slave.inc

# MDEV-359: There was a server crash when the code first checks if semisync
# is enabled without lock, then if so takes the lock and tests again.
# If semisync was disabled in-between the first and the second test, an
# assert was incorrectly made that referenced a NULL pointer.
#
# This tests uses debug_sync to pause one thread at the critical point in
# the code, disable the semisync, and then continue the paused thread.

CREATE TABLE t1 (a INT) ENGINE=MyISAM;
SET GLOBAL rpl_semi_sync_master_enabled = ON;
--connection master1
SET DEBUG_SYNC = "rpl_semisync_master_commit_trx_before_lock SIGNAL m1_ready WAIT_FOR m1_cont";
--send
INSERT INTO t1 SELECT * FROM t1;
--connection master
SET DEBUG_SYNC= "now WAIT_FOR m1_ready";
SET GLOBAL rpl_semi_sync_master_enabled = OFF;
SET DEBUG_SYNC= "now SIGNAL m1_cont";
--connection master1
--reap

connection master;
DROP TABLE t1;
SET DEBUG_SYNC= "RESET";

--source include/rpl_end.inc