SEGV during DROP generated column

origin/11.2, 11.2 2867894ac6ca23fc2f82cfad2dd510351f597325 2023-06-28T09:39:28+03:00

[rr 2046496 913936]230628 22:37:15 [rr 2046496 913939][ERROR] mysqld got signal 11 ;

Query (0x55756c010890): ALTER TABLE t1 DROP COLUMN IF EXISTS col_text_g, ALGORITHM = NOCOPY, LOCK = SHARED

[rr 2046496 935419]Status: KILL_TIMEOUT

Column definitions

   col_text_g GENERATED ALWAYS AS (SUBSTR(col_text,1,499))

                  <unknown to me, but PERSISTENT or VIRTUAL>

   col_text TEXT

Thread 3 received signal SIGSEGV, Segmentation fault.

[Switching to Thread 2046496.2065699]

ha_innobase::prepare_inplace_alter_table (this=<optimized out>, altered_table=<optimized out>, ha_alter_info=<optimized out>) at /data/Server/11.2A/storage/innobase/handler/handler0alter.cc:8411

8411                            dict_free_vc_templ(ctx->new_table->vc_templ);

(rr) bt

#0  ha_innobase::prepare_inplace_alter_table (this=<optimized out>, altered_table=<optimized out>, ha_alter_info=<optimized out>) at /data/Server/11.2A/storage/innobase/handler/handler0alter.cc:8411

#1  0x0000558cf20214ea in mysql_inplace_alter_table (target_mdl_request=0x41ea6cb9b560, if_exists=false, start_alter_id=@0x41ea6cb9ab40: 0, partial_alter=@0x41ea6cb9ab37: false, alter_ctx=0x41ea6cb9c750, 

    trigger_param=0x41ea6cb9b080, ddl_log_state=0x41ea6cb9aba0, ha_alter_info=0x41ea6cb9ac00, altered_table=0x41ea6cb9acc0, table=0x600810099fd8, table_list=0x55756c010a28, thd=0x55756c000c58)

    at /data/Server/11.2A/sql/sql_table.cc:7689

#2  mysql_alter_table (thd=thd@entry=0x55756c000c58, new_db=new_db@entry=0x55756c0055c0, new_name=new_name@entry=0x55756c005a10, create_info=create_info@entry=0x41ea6cb9d560, table_list=<optimized out>, 

    table_list@entry=0x55756c010a28, recreate_info=recreate_info@entry=0x41ea6cb9d450, alter_info=0x41ea6cb9d470, order_num=0, order=0x0, ignore=false, if_exists=false) at /data/Server/11.2A/sql/sql_table.cc:10846

#3  0x0000558cf2085e72 in Sql_cmd_alter_table::execute (this=<optimized out>, thd=0x55756c000c58) at /data/Server/11.2A/sql/structs.h:567

#4  0x0000558cf1f6b8a6 in mysql_execute_command (thd=0x55756c000c58, is_called_from_prepared_stmt=<optimized out>) at /data/Server/11.2A/sql/sql_parse.cc:5766

#5  0x0000558cf1f5be36 in mysql_parse (rawbuf=<optimized out>, length=<optimized out>, parser_state=<optimized out>, thd=0x55756c000c58) at /data/Server/11.2A/sql/sql_parse.cc:7774

#6  mysql_parse (thd=0x55756c000c58, rawbuf=<optimized out>, length=<optimized out>, parser_state=<optimized out>) at /data/Server/11.2A/sql/sql_parse.cc:7696

#7  0x0000558cf1f67d3a in dispatch_command (command=COM_QUERY, thd=0x55756c000c58, packet=<optimized out>, packet_length=<optimized out>, blocking=<optimized out>) at /data/Server/11.2A/sql/sql_class.h:1370

#8  0x0000558cf1f69c3e in do_command (thd=0x55756c000c58, blocking=blocking@entry=true) at /data/Server/11.2A/sql/sql_parse.cc:1405

#9  0x0000558cf2080f37 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x558cf47f07c8, put_in_cache=put_in_cache@entry=true) at /data/Server/11.2A/sql/sql_connect.cc:1416

#10 0x0000558cf208121d in handle_one_connection (arg=0x558cf47f07c8) at /data/Server/11.2A/sql/sql_connect.cc:1318

#11 0x000060080b484609 in start_thread (arg=<optimized out>) at pthread_create.c:477

#12 0x00007f64be82e293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

pluto:/data/results/1687979283/TBR-1983$ _RR_TRACE_DIR=./1/rr/ rr replay --mark-stdio

RQG

===

# git clone https://github.com/mleich1/rqg --branch <pick the right branch> RQG

#

# GIT_SHOW: HEAD -> master, origin/master, origin/HEAD 195e0fe57735ef889e10d823fc9c9b218994c6f5 2023-06-28T19:17:40+02:00

# rqg.pl  : Version 4.2.1 (2022-12)

#

# $RQG_HOME/rqg.pl \

# --grammar=conf/mariadb/table_stress_innodb_nocopy1.yy \

# --gendata=conf/mariadb/table_stress.zz \

# --gendata_sql=conf/mariadb/table_stress.sql \

# --reporters=RestartConsistency \

# --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 \

# --no_mask \

# --queries=10000000 \

# --seed=random \

# --reporters=None \

# --reporters=ErrorLog \

# --reporters=Deadlock \

# --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 \

# --mysqld=--plugin-load-add=provider_lzo.so \

# --mysqld=--plugin-load-add=provider_bzip2.so \

# --mysqld=--plugin-load-add=provider_lzma.so \

# --mysqld=--plugin-load-add=provider_snappy.so \

# --mysqld=--plugin-load-add=provider_lz4.so \

# --mysqld=--loose-innodb_compression_level=1 \

# --duration=300 \

# --mysqld=--loose-innodb_fatal_semaphore_wait_threshold=300 \

# --mysqld=--lock-wait-timeout=86400 \

# --mysqld=--innodb-lock-wait-timeout=50 \

# --mysqld=--loose-innodb_fast_shutdown=0 \

# --mysqld=--innodb_file_per_table=0 \

# --mysqld=--loose-innodb_read_only_compressed=OFF \

# --mysqld=--innodb_stats_persistent=on \

# --mysqld=--innodb_adaptive_hash_index=on \

# --mysqld=--innodb_random_read_ahead=OFF \

# --mysqld=--log-bin \

# --mysqld=--sync-binlog=1 \

# --mysqld=--loose-innodb_evict_tables_on_commit_debug=on \

# --mysqld=--loose-max-statement-time=30 \

# --threads=9 \

# --mysqld=--innodb-use-native-aio=0 \

# --mysqld=--loose-gdb \

# --mysqld=--loose-debug-gdb \

# --rr=Extended \

# --rr_options=--chaos --wait \

# --mysqld=--innodb_undo_log_truncate=OFF \

# --mysqld=--innodb_rollback_on_timeout=OFF \

# --mysqld=--innodb_page_size=16K \

# --mysqld=--innodb-buffer-pool-size=256M \

# <local settings>

Hitting the problem with the grammar

- table_stress_innodb_nocopy1.yy like used here is very rare

- table_stress_innodb_fk.yy is 5 times more frequent but the grammar fiddles with foreign

   keys which are error prone anyway