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  1. MariaDB Server
  2. MDEV-26979

heap-use-after-free or SIGSEGV when accessing INNODB_SYS_TABLESTATS during DDL

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      Bad effect detected by [~elenst] and easy reproduced after hint of [~marko].
      origin/10.6 3ab358f0f1c852c71a539bb2b18b3cf828cc0007 2021-11-04T10:22:06+01:00
       
      In case something like
         SELECT * FROM information_schema.innodb_sys_tablestats ;
      gets frequent executed within some average test running a lot DDL
      than the following might show up
       
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 55483][rr 1428002 55487]==1428002==ERROR: AddressSanitizer: heap-use-after-free on address 0x618000078955 at pc 0x55df0e4f1f7a bp 0x7f882ec63b30 sp 0x7f882ec63b20
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 55490][rr 1428002 55492]READ of size 1 at 0x618000078955 thread T30
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 55996]2021-11-05  6:52:55 32 [Note] InnoDB: Online DDL : Start reading clustered index of the table and create temporary files
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 61951]    #0 0x55df0e4f1f79 in dict_sys_t::find(dict_table_t const*) /data/Server/10.6I/storage/innobase/include/dict0dict.h:1513
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 61965]    #1 0x55df0e4f2160 in dict_sys_t::allow_eviction(dict_table_t*) (/data/Server_bin/10.6I_asan/bin/mariadbd+0x28e3160)
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 61975]    #2 0x55df0e4d0eef in i_s_sys_tables_fill_table_stats /data/Server/10.6I/storage/innobase/handler/i_s.cc:5129
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 61993]    #3 0x55df0d4d1d99 in get_schema_tables_result(JOIN*, enum_schema_table_state) /data/Server/10.6I/sql/sql_show.cc:8842
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62032]    #4 0x55df0d3b25e0 in JOIN::exec_inner() /data/Server/10.6I/sql/sql_select.cc:4694
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62034]    #5 0x55df0d3b05c5 in JOIN::exec() /data/Server/10.6I/sql/sql_select.cc:4515
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62042]    #6 0x55df0d3b41c6 in mysql_select(THD*, TABLE_LIST*, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) /data/Server/10.6I/sql/sql_select.cc:4994
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62044]    #7 0x55df0d38928e in handle_select(THD*, LEX*, select_result*, unsigned long) /data/Server/10.6I/sql/sql_select.cc:545
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62078]    #8 0x55df0d303e25 in execute_sqlcom_select /data/Server/10.6I/sql/sql_parse.cc:6256
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62080]    #9 0x55df0d2f2b38 in mysql_execute_command(THD*, bool) /data/Server/10.6I/sql/sql_parse.cc:3946
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62082]    #10 0x55df0d30de8b in mysql_parse(THD*, char*, unsigned int, Parser_state*) /data/Server/10.6I/sql/sql_parse.cc:8030
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62084]    #11 0x55df0d2e6108 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /data/Server/10.6I/sql/sql_parse.cc:1896
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62086]    #12 0x55df0d2e34e0 in do_command(THD*, bool) /data/Server/10.6I/sql/sql_parse.cc:1404
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62092]    #13 0x55df0d6e2f32 in do_handle_one_connection(CONNECT*, bool) /data/Server/10.6I/sql/sql_connect.cc:1418
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62102]    #14 0x55df0d6e27c3 in handle_one_connection /data/Server/10.6I/sql/sql_connect.cc:1312
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62110]    #15 0x7f8863a0f608 in start_thread /build/glibc-eX1tMB/glibc-2.31/nptl/pthread_create.c:477
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62112]    #16 0x7f88635e2292 in __clone (/lib/x86_64-linux-gnu/libc.so.6+0x122292)
      ....
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 62554]SUMMARY: AddressSanitizer: heap-use-after-free /data/Server/10.6I/storage/innobase/include/dict0dict.h:1513 in dict_sys_t::find(dict_table_t const*)
      # 2021-11-05T06:55:57 [1426338] | Query (0x62b000214238): SELECT * FROM information_schema.innodb_sys_tablestats
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 78184]
      # 2021-11-05T06:55:57 [1426338] | Connection ID (thread ID): 33
      # 2021-11-05T06:55:57 [1426338] | [rr 1428002 78186]Status: KILL_TIMEOUT
       
      sdp:/data/Results/1636120301/TBR-1218/dev/shm/vardir/1636120301/56/1/rr
       
      RQG
      -------
      # git clone https://github.com/mleich1/rqg --branch experimental RQG
      #
      # GIT_SHOW: HEAD -> experimental, origin/experimental fe8ba343b097bcb54fe31445e5d5699546b53e66 2021-11-03T20:19:53+01:00
      # rqg.pl  : Version 3.4 (2021-09)
      #
      # $RQG_HOME/rqg.pl \
      # --grammar=conf/runtime/alter_online.yy \
      # --gendata=conf/runtime/alter_online.zz \
      # --mysqld=--loose-innodb_lock_schedule_algorithm=fcfs \
      # --mysqld=--loose-idle_write_transaction_timeout=0 \
      # --mysqld=--loose-idle_transaction_timeout=0 \
      # --mysqld=--loose-idle_readonly_transaction_timeout=0 \
      # --mysqld=--connect_timeout=60 \
      # --mysqld=--interactive_timeout=28800 \
      # --mysqld=--slave_net_timeout=60 \
      # --mysqld=--net_read_timeout=30 \
      # --mysqld=--net_write_timeout=60 \
      # --mysqld=--loose-table_lock_wait_timeout=50 \
      # --mysqld=--wait_timeout=28800 \
      # --mysqld=--lock-wait-timeout=86400 \
      # --mysqld=--innodb-lock-wait-timeout=50 \
      # --no-mask \
      # --queries=10000000 \
      # --redefine=ElenaMarko.yy \
      # --seed=random \
      # --reporters=Backtrace \
      # --reporters=ErrorLog \
      # --reporters=Deadlock1 \
      # --validators=None \
      # --mysqld=--log_output=none \
      # --mysqld=--log_bin_trust_function_creators=1 \
      # --mysqld=--loose-debug_assert_on_not_freed_memory=0 \
      # --engine=InnoDB \
      # --restart_timeout=240 \
      # --mysqld=--plugin-load-add=file_key_management.so \
      # --mysqld=--loose-file-key-management-filename=$RQG_HOME/conf/mariadb/encryption_keys.txt \
      # --duration=300 \
      # --mysqld=--loose-innodb_fatal_semaphore_wait_threshold=300 \
      # --mysqld=--loose-innodb_read_only_compressed=OFF \
      # --mysqld=--loose-innodb-sync-debug \
      # --mysqld=--innodb_stats_persistent=off \
      # --mysqld=--innodb_adaptive_hash_index=on \
      # --mysqld=--loose-innodb_evict_tables_on_commit_debug=off \
      # --mysqld=--loose-max-statement-time=30 \
      # --threads=33 \
      # --mysqld=--innodb-use-native-aio=0 \
      # --rr=Extended \
      # --rr_options=--wait \
      # --mysqld=--innodb_undo_tablespaces=3 \
      # --mysqld=--innodb_undo_log_truncate=ON \
      # --mysqld=--innodb_page_size=8K \
      # --mysqld=--innodb-buffer-pool-size=256M \
      # --no_mask \
      # <certain local settings>
       
      ElenaMarko.yy contains
      query_add:
          SELECT * FROM information_schema.innodb_sys_tablestats ;
      
      

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            Assignee:
            marko Marko Mäkelä
            Reporter:
            mleich Matthias Leich
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              Dates

              Created:
              Updated:
              Resolved:

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