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  1. MariaDB Server
  2. MDEV-25766

Unused CTE lead to a crash in find_field_in_tables/find_order_in_list

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    Details

    • Type: Bug
    • Status: In Review (View Workflow)
    • Priority: Critical
    • Resolution: Unresolved
    • Affects Version/s: 10.2, 10.3, 10.4, 10.5, 10.5.9
    • Fix Version/s: 10.2, 10.3, 10.4, 10.5
    • Component/s: None
    • Labels:
    • Environment:
      Ubuntu 18.04
      MariaDB 10.5.9

      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_l2i8lidec INTEGER ,
      c_iv TEXT ,
      c_mp TEXT ,
      primary key(c_l2i8lidec),
      unique(c_l2i8lidec),
      check((t_ykc.c_l2i8lidec <= case when t_ykc.c_l2i8lidec in (
              t_ykc.c_l2i8lidec, t_ykc.c_l2i8lidec) then t_ykc.c_l2i8lidec else t_ykc.c_l2i8lidec end
            ) 
        or (t_ykc.c_iv like 'cfirh%e' AND t_ykc.c_l2i8lidec < t_ykc.c_l2i8lidec))
      );
       
      create view t_wk as 
      select  
          subq_0.c2 as c1, 
          subq_0.c4 as c2, 
          subq_0.c1 as c3, 
          subq_0.c4 as c4, 
          subq_0.c0 as c5, 
          11 as c6, 
          subq_0.c3 as c7, 
          (subq_0.c0 / subq_0.c1) as c8, 
          subq_0.c2 as c9, 
          (subq_0.c0 + subq_0.c3) as c10
        from 
          (select  
                ref_0.c_l2i8lidec as c0, 
                ref_0.c_l2i8lidec as c1, 
                ref_0.c_iv as c2, 
                ref_0.c_l2i8lidec as c3, 
                ref_0.c_l2i8lidec as c4, 
                ref_0.c_l2i8lidec as c5
              from 
                t_ykc as ref_0
              where ((select min(c_l2i8lidec) from t_ykc)
                     between ref_0.c_l2i8lidec and ref_0.c_l2i8lidec) 
                or (ref_0.c_l2i8lidec < ref_0.c_l2i8lidec)
              order by c0, c1, c2, c3, -c4, c5 asc) as subq_0
        where subq_0.c2 not like 'rpch%4go'
        order by c1, c2, c3, c4, c5, -c6, c7, c8, c9, c10 desc;
       
      WITH 
      jennifer_0 AS (select  
          subq_0.c4 as c6
        from 
          ((select  
                  11 as c4 
                from 
                  t_wk as ref_0
           ) as subq_0
            left outer join t_wk as ref_2
            on (11 <> 19))
      ) 
      select  
          subq_2.c2 as c4
        from 
          (select distinct 
                61 as c2
              from 
                t_ykc as ref_13
              ) as subq_2
      ;
      

      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: 0x62b00007e218
      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 = 0x7f26a2226600 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)[0x7f26c1a133c0]
      sql/protocol.h:0(Protocol_text)[0xe8530c]
      sql/sql_lex.cc:1164(Lex_input_stream::add_digest_token(unsigned int, YYSTYPE*))[0x1567533]
      sql/sql_parse.cc:8709(st_select_lex::add_cross_joined_table(TABLE_LIST*, TABLE_LIST*, bool))[0x17aeebc]
      ??:0(Lex_input_stream::body_utf8_append(char const*, char const*))[0x1564878]
      sql/sql_lex.cc:120(sp_expr_lex::case_stmt_action_when(bool))[0x155372f]
      sql_select.cc:0(change_cond_ref_to_const(THD*, I_List<COND_CMP>*, Item*, Item*, Item_bool_func2*, Item*, Item*))[0x1c45226]
      sql_select.cc:0(trace_table_dependencies(THD*, st_join_table*, unsigned int))[0x1c05a9e]
      ??:0(JOIN_CACHE::create_remaining_fields())[0x260f8eb]
      ??:0(JOIN_CACHE::create_remaining_fields())[0x260ee4d]
      ??:0(LEX::create_item_for_sp_var(Lex_ident_cli_st const*, sp_variable*))[0x15571b6]
      ??:0(select_create::abort_result_set())[0x1536385]
      sql/sql_insert.cc:5068(select_create::abort_result_set())[0x1534614]
      sql/sql_class.cc:2550(THD::make_string_literal_charset(Lex_string_with_metadata_st const&, charset_info_st const*))[0x1386f2f]
      sql/sql_cache.cc:4324(Query_cache::move_by_type(unsigned char**, Query_cache_block**, unsigned long*, Query_cache_block*))[0x133cf2d]
      ??: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)[0x7f26c1a07609]
      ??:0(clone)[0x7f26c0d79293]
       
      Trying to get some variables.
      Some pointers may be invalid and cause the dump to abort.
      Query (0x62b000085238): WITH
      jennifer_0 AS (select
          subq_0.c4 as c6
        from
          ((select
                  11 as c4
                from
                  t_wk as ref_0
           ) as subq_0
            left outer join t_wk as ref_2
            on (11 <> 19))
      )
      select
          subq_2.c2 as c4
        from
          (select distinct
                61 as c2
              from
                t_ykc as ref_13
              ) as subq_2
       
      Connection ID (thread ID): 637
      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:
              sanja Oleksandr Byelkin
              Reporter:
              Zuming Jiang Zuming Jiang
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                Dates

                Created:
                Updated: