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  1. MariaDB Server
  2. MDEV-363

Server crashes in intern_plugin_lock on concurrent installing semisync plugin and setting rpl_semi_sync_master_enabled

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      Also filed as http://bugs.mysql.com/bug.php?id=65711

      #3  <signal handler called>
      #4  0x000000000061ddfb in intern_plugin_lock (lex=0x24a83e8, rc=0x248e6f0) at sql/sql_plugin.cc:924
      #5  0x0000000000622c1d in find_sys_var (thd=0x24a6110, str=0x25a8a28 "rpl_semi_sync_master_enabled", length=28) at sql/sql_plugin.cc:2650
      #6  0x0000000000759b5a in find_sys_var_null_base (thd=0x24a6110, tmp=0x7fb73224e830) at sql/sql_yacc.yy:416
      #7  0x000000000077c283 in MYSQLparse (yythd=0x24a6110) at sql/sql_yacc.yy:13586
      #8  0x000000000061a5a1 in parse_sql (thd=0x24a6110, parser_state=0x7fb732250500, creation_ctx=0x0) at sql/sql_parse.cc:7602
      #9  0x00000000006165b1 in mysql_parse (thd=0x24a6110, rawbuf=0x25a8958 "SET GLOBAL rpl_semi_sync_master_enabled = ON", length=44, parser_state=0x7fb732250500) at sql/sql_parse.cc:5691
      #10 0x0000000000609f73 in dispatch_command (command=COM_QUERY, thd=0x24a6110, packet=0x25a1141 "SET GLOBAL rpl_semi_sync_master_enabled = ON", packet_length=44) at sql/sql_parse.cc:1055
      #11 0x000000000060922a in do_command (thd=0x24a6110) at sql/sql_parse.cc:794
      #12 0x000000000070a4ef in do_handle_one_connection (thd_arg=0x24a6110) at sql/sql_connect.cc:1253
      #13 0x0000000000709eda in handle_one_connection (arg=0x24a6110) at sql/sql_connect.cc:1168
      #14 0x0000000000bffb0f in pfs_spawn_thread (arg=0x2629ad0) at storage/perfschema/pfs.cc:1015
      #15 0x00007fb73d8adefc in start_thread (arg=0x7fb732251700) at pthread_create.c:304
      #16 0x00007fb73cc2059d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
      

      bzr version-info

      revision-id: knielsen@knielsen-hq.org-20120622084255-u53u21xv3w7sqxms
      date: 2012-06-22 10:42:55 +0200
      build-date: 2012-06-22 17:46:40 +0400
      revno: 3456
      

      (also reproducible on current MySQL 5.5 and MySQL trunk).

      MTR test case
      (you might try to run it with --repeat=N
      if you are not getting the crash right away)

      --connect (con1,127.0.0.1,root,,test)
      --error 0,ER_UNKNOWN_SYSTEM_VARIABLE
      SET GLOBAL rpl_semi_sync_master_enabled = OFF;
      --error 0,ER_SP_DOES_NOT_EXIST
      UNINSTALL PLUGIN rpl_semi_sync_master;
      --send
      INSTALL PLUGIN rpl_semi_sync_master SONAME 'semisync_master.so';
      --connection default
      --error 0,ER_UNKNOWN_SYSTEM_VARIABLE
      SET GLOBAL rpl_semi_sync_master_enabled = ON;
      --connection con1
      --reap
      

      If you are still not getting the crash, try this RQG grammar

      cat semi.yy

      thread1:
      	SET GLOBAL rpl_semi_sync_master_enabled = on_off ;
      
      query:
      	INSTALL PLUGIN rpl_semi_sync_master SONAME 'semisync_master.so' | UNINSTALL PLUGIN rpl_semi_sync_master ;
      
      on_off:
      	ON | OFF ;
      

      Run it as

      perl runall.pl \
      --grammar=semi.yy \
      --queries=100M \
      --threads=2 \
      --duration=300 \
      --skip-gendata \
      --basedir=<your basedir> --vardir=<your vardir>
      

      Make sure the tests find the library all right
      and if not, additionally provide plugin-dir on the command line

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              • Assignee:
                svoj Sergey Vojtovich
                Reporter:
                elenst Elena Stepanova
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                • Created:
                  Updated:
                  Resolved:

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