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  1. MariaDB Server
  2. MDEV-8282

crash in filesort() with simple ordered delete

Details

    Description

      Version: '10.1.5-MariaDB'  mariadb.org binary distribution
      		 
      [ERROR] mysqld got exception 0xc0000005 ;
      		 
      mysqld.exe!filesort()[filesort.cc:215]
      		 
      mysqld.exe!mysql_delete()[sql_delete.cc:507]
      		 
      mysqld.exe!mysql_execute_command()[sql_parse.cc:4041]
      		 
      mysqld.exe!mysql_parse()[sql_parse.cc:7178]
      		 
      mysqld.exe!dispatch_command()[sql_parse.cc:1473]
      		 
      mysqld.exe!do_command()[sql_parse.cc:1093]
      		 
      mysqld.exe!threadpool_process_request()[threadpool_common.cc:233]
      		 
      mysqld.exe!io_completion_callback()[threadpool_win.cc:568]

      How To Repeat:
      ---------------------
      Start server: mysqld.exe --no-defaults --console

      drop table if exists t1;
      		 
      create table t1(a int) engine=innodb;
      		 
      delete from t1 order by a;

      Attachments

        Activity

          Ascending order - Click to sort in descending order
          elenst Elena Stepanova added a comment -

          Thanks for the report and the test case.

          The problem was introduced with the following revision:

          commit 4938b822634b173c0d7ef882f721b553b223fadd
          		 
          Author: Sergei Petrunia <psergey@askmonty.org>
          		 
          Date:   Sun Apr 12 04:48:42 2015 +0300
          		 
           
          		 
              MDEV-7836: ANALYZE FORMAT=JSON should provide info about GROUP/ORDER BY
          		 
              
              Provide basic info about sorting/grouping done by the queries.

          elenst Elena Stepanova added a comment - Thanks for the report and the test case. The problem was introduced with the following revision: commit 4938b822634b173c0d7ef882f721b553b223fadd Author: Sergei Petrunia <psergey@askmonty.org> Date: Sun Apr 12 04:48:42 2015 +0300   MDEV-7836: ANALYZE FORMAT=JSON should provide info about GROUP/ORDER BY Provide basic info about sorting/grouping done by the queries.
          psergei Sergei Petrunia added a comment -

          It crashes because of the following scenario:

          • DELETE code sees no WHERE clause and decides to call h->delete_all_rows().
          • We remember that in the query plan
          • ha_innobase::delete_all_rows() returns HA_ERR_NOT_IMPLEMENTED
          • execution proceeds to do regular row-by-row deletion. That includes doing filesort.
            However, we didn't set up the QEP to support sorting, so we crash.
          psergei Sergei Petrunia added a comment - It crashes because of the following scenario: DELETE code sees no WHERE clause and decides to call h->delete_all_rows(). We remember that in the query plan ha_innobase::delete_all_rows() returns HA_ERR_NOT_IMPLEMENTED execution proceeds to do regular row-by-row deletion. That includes doing filesort. However, we didn't set up the QEP to support sorting, so we crash.

          People

            psergei Sergei Petrunia
            sbester1 sbester1
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            Dates

              Created:
              Updated:
              Resolved:

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