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  1. MariaDB Server
  2. MDEV-29489

Assertion `lock_table_has(trx, index->table, LOCK_IX)' failed at lock0lock.cc:6025

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      I used my fuzzing tool to test MariaDB and found a transaction-related bug that make the crashes. This bug might be similar to the bug MDEV-29233 that I previously reported. But the file location of bug triggering and the stack trace are quite different from MDEV-29233. Based on my experience, it might be a different bug.

      Mariadb installation
      1) cd mariadb-10.10.1
      2) mkdir build; cd build
      3) cmake .. -DCMAKE_BUILD_TYPE=Debug -DWITH_ASAN=ON
      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_1> START TRANSACTION;
      conn_0> START TRANSACTION;
      conn_1> update t_yfrkzd set wkey = 80;
      conn_1> delete from t_yfrkzd
      where
      t_yfrkzd.c_n1makd between t_yfrkzd.c_n1makd and t_yfrkzd.wkey;
      conn_0> delete from t_ywo4_b
      where
      t_ywo4_b.c_hlsgr not in (
      select
      ref_0.pkey as c0
      from
      (t_yfrkzd as ref_0
      inner join (select
      ref_1.wkey as c0
      from
      t_yfrkzd as ref_1
      ) as subq_0
      on (ref_0.wkey = subq_0.c0 ))); --- this DELETE blocks
      conn_1> delete from t_yfrkzd
      where
      (t_yfrkzd.c_aob5e not in (
      select
      ref_1.c_k4lijb as c0
      from
      t_ywo4_b as ref_1)); --- this DELETE make the above DELETE crash the maridb server
      conn_1> ROLLBACK;
      conn_0> 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).

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              vlad.lesin Vladislav Lesin
              Zuming Jiang Zuming Jiang
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