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  1. MariaDB Server
  2. MDEV-29118

Assertion `lock_table_has(trx, index->table, LOCK_IX)' failed at lock0lock.cc:4972

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    Description

      I used my fuzzing tool to test MariaDB and found a transaction-related bug that make the crashes.

      Mariadb installation
      1) cd mariadb-10.8.3
      2) mkdir build; cd build
      3) cmake .. -DCMAKE_BUILD_TYPE=Debug
      4) make -j12 && sudo make install

      Setup the environment
      1) export ASAN_OPTIONS=detect_leaks=0
      2) /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql &
      3) /usr/local/mysql/bin/mysql -uroot -Dtestdb < mysql_bk.sql (attached) # set up the database

      Reproduce bug

      /usr/local/mysql/bin/mysql -uroot -Dtestdb # set up connection conn_0
      /usr/local/mysql/bin/mysql -uroot -Dtestdb # set up connection conn_1

      conn_0> START TRANSACTION;

      conn_0> delete from t_davsbd;

      conn_1> START TRANSACTION;

      conn_1> insert into t_iqij_c (wkey, pkey, c_svp9sc, c_anyvkb) values
      (115, 222000, ASCII('w_3pab'), null),
      (115, 223000, CHAR_LENGTH(
      case when ((select wkey from t_j4mbqd order by wkey limit 1 offset 34)
      in (select ref_0.pkey as c0 from t_davsbd as ref_0))
      then 'k0hpvb' else 'sss' end), null); --- this INSERT blocks

      conn_0> update t_j4mbqd set wkey = 190; --- this UPDATE make the above INSERT crash the maridb server

      conn_0> ROLLBACK;

      conn_1> ROLLBACK;

      I have simplified the content of the test case, and I hope this report can help you reproduce and fix the bug. In addition, I attached the failure report (which has its stack trace).

      Attachments

        1. bug_report.txt
          7 kB
          Zuming Jiang
        2. mysql_bk.sql
          6 kB
          Zuming Jiang

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              vlad.lesin Vladislav Lesin
              Zuming Jiang Zuming Jiang
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                Resolved:

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