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  1. MariaDB Server
  2. MDEV-37500

Assertion `n_sample_pages > 0 && n_sample_pages <= (index->stat_index_size <= 1 ? 1 : index->stat_index_size)' failed

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    • Can result in hang or crash

    Description

      Found this Assertion while testing MDEV-16168
      Please check if this issue is related to MDEV-16168

      Leads to :-

       
      # 2025-08-26T10:03:31 [2273331] | mariadbd: /data/Server/MDEV-16168/storage/innobase/dict/dict0stats.cc:953: std::__debug::vector<index_field_stats_t> btr_estimate_number_of_different_key_vals(dict_index_t*, trx_id_t): Assertion `n_sample_pages > 0 && n_sample_pages <= (index->stat_index_size <= 1 ? 1 : index->stat_index_size)' failed.
      

      Stacktrace

      # 2025-08-26T10:07:40 [2273331] | Thread 3 (Thread 2287488.2297752 (mariadbd)):
      # 2025-08-26T10:07:40 [2273331] | #0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=35129841100352) at ./nptl/pthread_kill.c:44
      # 2025-08-26T10:07:40 [2273331] | #1  __pthread_kill_internal (signo=6, threadid=35129841100352) at ./nptl/pthread_kill.c:78
      # 2025-08-26T10:07:40 [2273331] | #2  __GI___pthread_kill (threadid=35129841100352, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
      # 2025-08-26T10:07:40 [2273331] | #3  0x000000006fe16476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
      # 2025-08-26T10:07:40 [2273331] | #4  0x000000006fdfc7f3 in __GI_abort () at ./stdlib/abort.c:79
      # 2025-08-26T10:07:40 [2273331] | #5  0x000000006fdfc71b in __assert_fail_base (fmt=0x6ffb1130 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x561f4dd3a268 "n_sample_pages > 0 && n_sample_pages <= (index->stat_index_size <= 1 ? 1 : index->stat_index_size)", file=0x561f4dd37778 "/data/Server/MDEV-16168/storage/innobase/dict/dict0stats.cc", line=953, function=<optimized out>) at ./assert/assert.c:92
      # 2025-08-26T10:07:40 [2273331] | #6  0x000000006fe0de96 in __GI___assert_fail (assertion=0x561f4dd3a268 "n_sample_pages > 0 && n_sample_pages <= (index->stat_index_size <= 1 ? 1 : index->stat_index_size)", file=0x561f4dd37778 "/data/Server/MDEV-16168/storage/innobase/dict/dict0stats.cc", line=953, function=0x561f4dd3a1f8 "std::__debug::vector<index_field_stats_t> btr_estimate_number_of_different_key_vals(dict_index_t*, trx_id_t)") at ./assert/assert.c:101
      # 2025-08-26T10:07:40 [2273331] | #7  0x0000561f4d759caa in btr_estimate_number_of_different_key_vals (index=index@entry=0x3775500967f0, bulk_trx_id=0) at /data/Server/MDEV-16168/storage/innobase/dict/dict0stats.cc:953
      # 2025-08-26T10:07:40 [2273331] | #8  0x0000561f4d75b20b in dict_stats_update_transient_for_index (index=index@entry=0x3775500967f0) at /data/Server/MDEV-16168/storage/innobase/dict/dict0stats.cc:1192
      # 2025-08-26T10:07:40 [2273331] | #9  0x0000561f4d75b96f in dict_stats_update_transient (table=table@entry=0x377550066b50) at /data/Server/MDEV-16168/storage/innobase/dict/dict0stats.cc:1267
      # 2025-08-26T10:07:40 [2273331] | #10 0x0000561f4d75bc85 in dict_stats_update (table=table@entry=0x377550066b50, stats_upd_option=stats_upd_option@entry=DICT_STATS_RECALC_TRANSIENT) at /data/Server/MDEV-16168/storage/innobase/dict/dict0stats.cc:3813
      # 2025-08-26T10:07:40 [2273331] | #11 0x0000561f4d76e2fe in dict_stats_update_if_needed (table=table@entry=0x377550066b50, trx=...) at /data/Server/MDEV-16168/storage/innobase/dict/dict0stats_bg.cc:206
      # 2025-08-26T10:07:40 [2273331] | #12 0x0000561f4d58ef05 in row_insert_for_mysql (mysql_rec=mysql_rec@entry=0x1acf5004c4c8 "\377", prebuilt=0x1acf50055b70, ins_mode=<optimized out>) at /data/Server/MDEV-16168/storage/innobase/row/row0mysql.cc:1395
      # 2025-08-26T10:07:40 [2273331] | #13 0x0000561f4d3be23e in ha_innobase::write_row (this=0x1acf5004bcc8, record=0x1acf5004c4c8 "\377") at /data/Server/MDEV-16168/storage/innobase/handler/ha_innodb.cc:7846
      # 2025-08-26T10:07:40 [2273331] | #14 0x0000561f4d0330ea in handler::ha_write_row (this=0x1acf5004bcc8, buf=0x1acf5004c4c8 "\377") at /data/Server/MDEV-16168/sql/handler.cc:7762
      # 2025-08-26T10:07:40 [2273331] | #15 0x0000561f4cce4641 in write_record (thd=thd@entry=0x1acf50001a38, table=table@entry=0x1acf5004b858, info=info@entry=0x1ff34db30cb0, sink=sink@entry=0x0) at /data/Server/MDEV-16168/sql/sql_insert.cc:2310
      # 2025-08-26T10:07:40 [2273331] | #16 0x0000561f4ccec72d in mysql_insert (thd=thd@entry=0x1acf50001a38, table_list=0x1acf500143c0, fields=..., values_list=..., update_fields=..., update_values=..., duplic=DUP_ERROR, ignore=false, result=0x0) at /data/Server/MDEV-16168/sql/sql_insert.cc:1170
      # 2025-08-26T10:07:40 [2273331] | #17 0x0000561f4cd2fc31 in mysql_execute_command (thd=thd@entry=0x1acf50001a38, is_called_from_prepared_stmt=is_called_from_prepared_stmt@entry=false) at /data/Server/MDEV-16168/sql/sql_parse.cc:4634
      # 2025-08-26T10:07:40 [2273331] | #18 0x0000561f4cd357a0 in mysql_parse (thd=thd@entry=0x1acf50001a38, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x1ff34db31390) at /data/Server/MDEV-16168/sql/sql_parse.cc:8200
      # 2025-08-26T10:07:40 [2273331] | #19 0x0000561f4cd37d3b in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x1acf50001a38, packet=packet@entry=0x1acf5000bba9 " INSERT INTO t6 (col1,col2, col_int, col_string, col_text) VALUES ( NULL, NULL - 1, NULL, REPEAT(SUBSTR(CAST( NULL AS CHAR),1,1), 10), REPEAT(SUBSTR(CAST( NULL AS CHAR),1,1), @fill_amount) ) /* E_R Thread14 QNO 24 CON_ID 29 */ ", packet_length=packet_length@entry=227, blocking=blocking@entry=true) at /data/Server/MDEV-16168/sql/sql_parse.cc:1908
      # 2025-08-26T10:07:40 [2273331] | #20 0x0000561f4cd39be5 in do_command (thd=thd@entry=0x1acf50001a38, blocking=blocking@entry=true) at /data/Server/MDEV-16168/sql/sql_parse.cc:1421
      # 2025-08-26T10:07:40 [2273331] | #21 0x0000561f4ce91ff8 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x561f50a8f668, put_in_cache=put_in_cache@entry=true) at /data/Server/MDEV-16168/sql/sql_connect.cc:1386
      # 2025-08-26T10:07:40 [2273331] | #22 0x0000561f4ce9222d in handle_one_connection (arg=0x561f50a8f668) at /data/Server/MDEV-16168/sql/sql_connect.cc:1298
      # 2025-08-26T10:07:40 [2273331] | #23 0x000000006fe68ac3 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
      # 2025-08-26T10:07:40 [2273331] | #24 0x000000006fef9a04 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:100
      

      RR trace is present on pluto :
      /data/results/1756193489/TBR-2210

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              saahil Saahil Alam
              saahil Saahil Alam
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