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  1. MariaDB Server
  2. MDEV-25761

Assertion `aggr != __null' failed in sub_select_postjoin_aggr

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      Description

      I used my fuzzing tool to test Mariadb , and found a bug that can result in an abortion.

      Mariadb installation:
      1) cd mariadb-10.5.9
      2) mkdir build; cd build
      3) cmake -DWITH_ASAN=ON -DWITH_ASAN_SCOPE=ON -DWITH_DEBUG=ON ../
      4) make -j8 && sudo make install

      How to Repeat:
      export ASAN_OPTIONS=detect_leaks=0
      /usr/local/mysql/bin/mysqld_safe &
      /usr/local/mysql/bin/mysql -uroot -p123456(your password)
      MariaDB> drop database if exists test_db;
      MariaDB> create database test_db;
      MariaDB> source fuzz.sql;

      I have simplified the content of fuzz.sql, and I hope fuzz.sql can help you reproduce the bug and fix it. In addition, I attach the abortion report (which has its stack trace).

      --fuzz.sql
      create table t_ykc (
      c_l2i8lmdew INTEGER NOT NULL,
      c_axhvkeda INTEGER ,
      primary key(c_l2i8lmdew),
      unique(c_l2i8lmdew)
      );
       
      create table t_c2lhzj as
      select
          ref_0.c_l2i8lmdew as c0,
          ref_0.c_l2i8lmdew as c2,
          ref_0.c_l2i8lmdew as c3
        from
          t_ykc as ref_0
        where ref_0.c_l2i8lmdew < ref_0.c_l2i8lmdew;
       
      alter table t_ykc rename column c_l2i8lmdew to c_o2btif85c;
       
      insert into t_ykc values
      ((55 << 94), (84 + 5)),
      ((65 / 16), 9),
      (31, 76);
       
      delete from t_ykc
      where
      t_ykc.c_o2btif85c = (
        select distinct
              t_ykc.c_o2btif85c as c0
            from
              (t_c2lhzj as ref_0
                cross join t_c2lhzj as ref_1
                )
          union all
          select distinct
              52 as c0
            from
              t_c2lhzj as ref_2
            where t_ykc.c_o2btif85c >= t_ykc.c_o2btif85c);
      

      abortion_report.txt

      This could be because you hit a bug. It is also possible that this binary
      or one of the libraries it was linked against is corrupt, improperly built,
      or misconfigured. This error can also be caused by malfunctioning hardware.
       
      To report this bug, see https://mariadb.com/kb/en/reporting-bugs
       
      We will try our best to scrape up some info that will hopefully help
      diagnose the problem, but since we have already crashed,
      something is definitely wrong and this may fail.
       
      Server version: 10.5.9-MariaDB
      key_buffer_size=134217728
      read_buffer_size=131072
      max_used_connections=2
      max_threads=153
      thread_count=2
      It is possible that mysqld could use up to
      key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467864 K  bytes of memory
      Hope that's ok; if not, decrease some variables in the equation.
       
      Thread pointer: 0x62b0003aa218
      Attempting backtrace. You can use the following information to find out
      where mysqld died. If you see no messages after this, something went
      terribly wrong...
      stack_bottom = 0x7f5164121600 thread_stack 0x5fc00
      /usr/local/mysql/bin/mariadbd(__interceptor_backtrace+0x5b)[0x917bfb]
      :0(mi_state_info_read)[0x6ad5ad8]
      sql/sql_yacc.cc:46457(MYSQLparse(THD*))[0x2beef02]
      sigaction.c:0(__restore_rt)[0x7f518fcf13c0]
      sql/sql_parse.cc:0(execute_sqlcom_select(THD*, TABLE_LIST*))[0x17847aa]
      sql/sql_lex.cc:11194(LEX::stmt_alter_procedure_start(sp_name*))[0x1656121]
      sql/sql_parse.cc:6294(execute_sqlcom_select(THD*, TABLE_LIST*))[0x17877dd]
      ??:0(Item_func_trim_oracle::Item_func_trim_oracle(THD*, Item*, Item*))[0x1687930]
      sql/item_cmpfunc.h:3452(Item_func_cursor_isopen)[0x167fc53]
      sql/sql_explain.h:350(Explain_union)[0x1676897]
      sql/sql_select.cc:9737(best_extension_by_limited_search(JOIN*, unsigned long long, unsigned int, double, double, unsigned int, unsigned int, unsigned int))[0x1c19a34]
      ??:0(cmp_item_int::cmp(Item*))[0x33658c1]
      ??:0(Item_func_in::mark_as_condition_AND_part(TABLE_LIST*))[0x32f5c99]
      ??:0(Item_cond_and::val_int())[0x33080b9]
      sql/field.cc:5397(Field_timestamp::val_str(String*, String*))[0x2e73cef]
      sql/field.h:3309(Field_timestamp_hires::size_of() const)[0x2f4f45a]
      ??:0(Field_time0::get_date(st_mysql_time*, date_mode_t))[0x2e96d3a]
      sql_show.cc:0(show_create_view(THD*, TABLE_LIST*, String*))[0x1cca61c]
      ??:0(Rotate_log_event::do_update_pos(rpl_group_info*))[0x3b1d4b5]
      ??:0(Load_log_event::do_apply_event(st_net*, rpl_group_info*, bool))[0x3b136ce]
      ??:0(THD::THD(unsigned long long, bool))[0x1355914]
      ??:0(Query_cache::store_query(THD*, TABLE_LIST*))[0x1308593]
      ??:0(Query_cache::lock_and_suspend())[0x12f7243]
      ??:0(Query_cache::is_cacheable(THD*, LEX*, TABLE_LIST*, unsigned char*))[0x130cd19]
      ??:0(st_select_lex_unit::cleanup())[0x2023c1d]
      ??:0(st_select_lex_unit::cleanup())[0x202215d]
      maria/ma_write.c:402(maria_write)[0x46e90f3]
      nptl/pthread_create.c:478(start_thread)[0x7f518fce5609]
      ??:0(clone)[0x7f518f057293]
       
      Trying to get some variables.
      Some pointers may be invalid and cause the dump to abort.
      Query (0x62b0003b1238): delete from t_ykc
      where
      t_ykc.c_o2btif85c = (
        select distinct
              t_ykc.c_o2btif85c as c0
            from
              (t_c2lhzj as ref_0
                cross join t_c2lhzj as ref_1
                )
          union all
          select distinct
              52 as c0
            from
              t_c2lhzj as ref_2
            where t_ykc.c_o2btif85c >= t_ykc.c_o2btif85c)
       
      Connection ID (thread ID): 171
      Status: NOT_KILLED
       
      Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materialized=on,condition_pushdown_for_subquery=on,rowid_filter=on,condition_pushdown_from_having=on,not_null_range_scan=off
       
      The manual page at https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mysqld/ contains
      information that should help you find out what is causing the crash.
      Writing a core file...
      Working directory at /usr/local/mysql/data
      Resource Limits:
      Limit                     Soft Limit           Hard Limit           Units
      Max cpu time              unlimited            unlimited            seconds
      Max file size             unlimited            unlimited            bytes
      Max data size             unlimited            unlimited            bytes
      Max stack size            8388608              unlimited            bytes
      Max core file size        0                    0                    bytes
      Max resident set          unlimited            unlimited            bytes
      Max processes             79624                79624                processes
      Max open files            1048576              1048576              files
      Max locked memory         67108864             67108864             bytes
      Max address space         unlimited            unlimited            bytes
      Max file locks            unlimited            unlimited            locks
      Max pending signals       79624                79624                signals
      Max msgqueue size         819200               819200               bytes
      Max nice priority         0                    0
      Max realtime priority     0                    0
      Max realtime timeout      unlimited            unlimited            us
      Core pattern: core
      
      

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              Assignee:
              psergei Sergei Petrunia
              Reporter:
              Zuming Jiang Zuming Jiang
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                Created:
                Updated:

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