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a97c190d95
When the semisync slave is being stopped with STOP SLAVE just after the master was shut down it attempts to reconnect with the master anyway per a semisync routine. Instead of an expected error the io-thread segfauls in mysql_real_connect() execution at !mysql->options.extension->async_context check trying to reach the extension's member while mysql->options.extension is actually and correctly NULL. Apparently not-NULL check for mysql->options.extension was missed and it's deployed by the patch to fix this issue. As a bonus it also tackles an assert Thread 0x7f16c72148c0 (LWP 24639) 0x00007f16c53b3bf2 in __GI___assert_fail (assertion=0x55a686117558 "global_status_var.global_memory_used == 0", file=0x55a6861171e8 "/home/andrei/MDB/WTs/10.3-clean/sql/mysqld.cc", line=2201, function=0x55a68611fa80 <mysqld_exit(int)::__PRETTY_FUNCTION__> "void mysqld_exit(int)") at assert.c:101 in a new test of the patch. The reason of the assert was insufficient cleanup in Repl_semi_sync_slave::kill_connection() which has a branch where a MYSQL instance was left out unfred.
61 lines
1.5 KiB
Plaintext
61 lines
1.5 KiB
Plaintext
# MDEV-16812 Semisync slave io thread segfaults at STOP-SLAVE handling
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#
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# The test verifies that the semisync-enabled slave io thread
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# finishes off as specified in particular trying to connect even to a shut down
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# master for a semisync firewell routine.
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source include/not_embedded.inc;
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source include/have_debug.inc;
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source include/master-slave.inc;
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--connection master
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--let $sav_enabled_master=`SELECT @@GLOBAL.rpl_semi_sync_master_enabled `
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SET @@GLOBAL.rpl_semi_sync_master_enabled = 1;
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--connection slave
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source include/stop_slave.inc;
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--let $sav_enabled_slave=`SELECT @@GLOBAL.rpl_semi_sync_slave_enabled `
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SET @@GLOBAL. rpl_semi_sync_slave_enabled = 1;
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source include/start_slave.inc;
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--connection master
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CREATE TABLE t1 (a INT);
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INSERT INTO t1 SET a=1;
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--sync_slave_with_master
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connection master;
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--echo # Shutdown master
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--let $rpl_server_number=1
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source include/rpl_stop_server.inc;
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--connection slave
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--source include/stop_slave.inc
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#connection master;
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--echo # Restart master
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--let $rpl_server_number=1
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source include/rpl_start_server.inc;
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#
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# Clean up
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#
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--connection slave
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--source include/stop_slave.inc
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--source include/start_slave.inc
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--connection master
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SET @@GLOBAL.debug_dbug="";
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--eval SET @@GLOBAL. rpl_semi_sync_master_enabled = $sav_enabled_master
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--connection master
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DROP TABLE t1;
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--sync_slave_with_master
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source include/stop_slave.inc;
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--eval SET @@GLOBAL. rpl_semi_sync_slave_enabled = $sav_enabled_slave
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--let $rpl_only_running_threads= 1
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--source include/rpl_end.inc
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