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  1. MariaDB Server
  2. MDEV-15354

[Draft] Deadlock and long semaphore wait

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      https://api.travis-ci.org/v3/job/343174384/log.txt

      10.3 afc56a509cc7d3d651ca68ad826ca183da8dc7cc

      2018-02-19  2:21:33 0 [Warning] No argument was provided to --log-bin and neither --log-basename or --log-bin-index where used;  This may cause repliction to break when this server acts as a master and has its hostname changed! Please use '--log-basename=travis-job-2c04e288-c888-4f72-9854-d0be989b4aa8' or '--log-bin=mysql-bin' to avoid this problem.
      Version: '10.3.5-MariaDB-debug-log'  socket: '/home/travis/logs/vardir1_1/mysql.sock'  port: 19300  Source distribution
      2018-02-19  2:22:17 18 [Warning] Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT. Statement is unsafe because it uses a system function that may return a different value on the slave Statement: OPTIMIZE TABLE t2 /* QNO 407 CON_ID 18 */
      2018-02-19  2:29:56 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 140046538405632 has waited at ha_innodb.cc line 13024 for 241.00 seconds the semaphore:
      X-lock on RW-latch at 0x5580c8f59680 created in file dict0dict.cc line 1109
      a writer (thread id 140046885218048) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 4191
      2018-02-19  2:29:56 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 140046124443392 has waited at dict0dict.cc line 1003 for 241.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046538405632 has waited at ha_innodb.cc line 13024 for 241.00 seconds the semaphore:
      X-lock on RW-latch at 0x5580c8f59680 created in file dict0dict.cc line 1109
      a writer (thread id 140046885218048) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 4191
      --Thread 140046884914944 has waited at dict0dict.cc line 1162 for 153.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046537799424 has waited at dict0dict.cc line 1162 for 186.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046884308736 has waited at dict0dict.cc line 498 for 217.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046538102528 has waited at dict0dict.cc line 498 for 156.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046124443392 has waited at dict0dict.cc line 1003 for 241.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      InnoDB: ###### Starts InnoDB Monitor for 30 secs to print diagnostic info:
      InnoDB: Pending reads 0, writes 0
      =====================================
      2018-02-19 02:30:14 0x7f5f0c9f4700 INNODB MONITOR OUTPUT
      =====================================
      Per second averages calculated from the last 32 seconds
      -----------------
      BACKGROUND THREAD
      -----------------
      srv_master_thread loops: 58 srv_active, 0 srv_shutdown, 201 srv_idle
      srv_master_thread log flush and writes: 258
      ----------
      SEMAPHORES
      ----------
      -------------
      RW-LATCH INFO
      -------------
      RW-LOCK: 0x5580c8f59680  (1 waiters)
      Locked: thread 140046885218048 file row0mysql.cc line 4191  X-LOCK
      Total number of rw-locks 16528
      OS WAIT ARRAY INFO: reservation count 7392
      --Thread 140046538405632 has waited at ha_innodb.cc line 13024 for 259.00 seconds the semaphore:
      X-lock on RW-latch at 0x5580c8f59680 created in file dict0dict.cc line 1109
      a writer (thread id 140046885218048) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 4191
      --Thread 140046884914944 has waited at dict0dict.cc line 1162 for 171.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046537799424 has waited at dict0dict.cc line 1162 for 204.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046884308736 has waited at dict0dict.cc line 498 for 235.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046538102528 has waited at dict0dict.cc line 498 for 174.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046124443392 has waited at dict0dict.cc line 1003 for 259.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      OS WAIT ARRAY INFO: signal count 3547
      RW-shared spins 0, rounds 1552, OS waits 714
      RW-excl spins 0, rounds 5919, OS waits 253
      RW-sx spins 3, rounds 9, OS waits 0
      Spin rounds per wait: 1552.00 RW-shared, 5919.00 RW-excl, 3.00 RW-sx
      ------------------------
      LATEST DETECTED DEADLOCK
      ------------------------
      2018-02-19 02:23:08 0x7f5f202c7700
      *** (1) TRANSACTION:
      TRANSACTION 23245, ACTIVE 0 sec inserting
      mysql tables in use 1, locked 1
      LOCK WAIT 4 lock struct(s), heap size 1160, 7 row lock(s), undo log entries 6
      MySQL thread id 33, OS thread handle 140046884914944, query id 6396 localhost 127.0.0.1 rqg Reading file
      LOAD DATA INFILE 'load_table10_int' REPLACE INTO TABLE table10_int /* QNO 726 CON_ID 17 */
      *** (1) WAITING FOR THIS LOCK TO BE GRANTED:
      RECORD LOCKS space id 72 page no 3 n bits 96 index PRIMARY of table `test`.`table10_int` trx id 23245 lock_mode X waiting
      Record lock, heap no 5 PHYSICAL RECORD: n_fields 7; compact format; info bits 0
       0: len 4; hex 80000004; asc     ;;
       1: len 7; hex 7fffffff0f423f; asc      B?;;
       2: len 6; hex 000000000000; asc       ;;
       3: len 7; hex 80000000000000; asc        ;;
       4: SQL NULL;
       5: SQL NULL;
       6: len 7; hex 5a8a350c00e256; asc Z 5   V;;
      *** (2) TRANSACTION:
      TRANSACTION 23232, ACTIVE 0 sec inserting
      mysql tables in use 1, locked 1
      7 lock struct(s), heap size 1160, 13 row lock(s), undo log entries 30
      MySQL thread id 29, OS thread handle 140046538405632, query id 6461 localhost 127.0.0.1 rqg Reading file
      LOAD DATA INFILE 'load_table10_int' IGNORE INTO TABLE table10_int /* QNO 1784 CON_ID 16 */
      *** (2) HOLDS THE LOCK(S):
      RECORD LOCKS space id 72 page no 3 n bits 88 index PRIMARY of table `test`.`table10_int` trx id 23232 lock mode S
      Record lock, heap no 5 PHYSICAL RECORD: n_fields 7; compact format; info bits 0
       0: len 4; hex 80000004; asc     ;;
       1: len 7; hex 7fffffff0f423f; asc      B?;;
       2: len 6; hex 000000000000; asc       ;;
       3: len 7; hex 80000000000000; asc        ;;
       4: SQL NULL;
       5: SQL NULL;
       6: len 7; hex 5a8a350c00e256; asc Z 5   V;;
      *** (2) WAITING FOR THIS LOCK TO BE GRANTED:
      RECORD LOCKS space id 72 page no 3 n bits 96 index PRIMARY of table `test`.`table10_int` trx id 23232 lock mode S waiting
      Record lock, heap no 2 PHYSICAL RECORD: n_fields 7; compact format; info bits 0
       0: len 4; hex 80000001; asc     ;;
       1: len 7; hex 7fffffff0f423f; asc      B?;;
       2: len 6; hex 000000005acd; asc     Z ;;
       3: len 7; hex 300000015805a3; asc 0   X  ;;
       4: SQL NULL;
       5: len 4; hex b2820000; asc     ;;
       6: len 7; hex 5a8a350c03272f; asc Z 5  '/;;
      *** WE ROLL BACK TRANSACTION (1)
      ------------
      TRANSACTIONS
      ------------
      Trx id counter 4089434
      Purge done for trx's n:o < 23635 undo n:o < 0 state: running but idle
      History list length 276
      Total number of lock structs in row lock hash table 5
      LIST OF TRANSACTIONS FOR EACH SESSION:
      ---TRANSACTION 421521862852104, not started
      0 lock struct(s), heap size 1160, 0 row lock(s)
      ---TRANSACTION 421521862845048, not started
      0 lock struct(s), heap size 1160, 0 row lock(s)
      ---TRANSACTION 421521862848576, not started
      0 lock struct(s), heap size 1160, 0 row lock(s)
      ---TRANSACTION 421521862843872, not started
      0 lock struct(s), heap size 1160, 0 row lock(s)
      ---TRANSACTION 421521862847400, not started
      0 lock struct(s), heap size 1160, 0 row lock(s)
      ---TRANSACTION 421521862842696, not started
      0 lock struct(s), heap size 1160, 0 row lock(s)
      ---TRANSACTION 421521862841520, not started
      0 lock struct(s), heap size 1160, 0 row lock(s)
      ---TRANSACTION 4089431, ACTIVE 0 sec dropping table
      0 lock struct(s), heap size 1160, 0 row lock(s)
      MySQL thread id 32, OS thread handle 140046885218048, query id 11920 localhost 127.0.0.1 rqg Closing tables
      DROP DATABASE IF EXISTS testdb_N /* QNO 1278 CON_ID 19 */
      ---TRANSACTION 4089433, ACTIVE 0 sec
      1 lock struct(s), heap size 1160, 0 row lock(s)
      ---TRANSACTION 23634, ACTIVE 409 sec
      11 lock struct(s), heap size 1160, 36 row lock(s), undo log entries 31
      MySQL thread id 33, OS thread handle 140046884914944, query id 12000 localhost 127.0.0.1 rqg Opening tables
      SHOW CREATE TABLE t6 /* QNO 2170 CON_ID 17 */
      Trx read view will not see trx with id >= 23630, sees < 23371
      --------
      FILE I/O
      --------
      I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
      I/O thread 1 state: waiting for completed aio requests (log thread)
      I/O thread 2 state: waiting for completed aio requests (read thread)
      I/O thread 3 state: waiting for completed aio requests (read thread)
      I/O thread 4 state: waiting for completed aio requests (read thread)
      I/O thread 5 state: waiting for completed aio requests (read thread)
      I/O thread 6 state: waiting for completed aio requests (write thread)
      I/O thread 7 state: waiting for completed aio requests (write thread)
      I/O thread 8 state: waiting for completed aio requests (write thread)
      I/O thread 9 state: waiting for completed aio requests (write thread)
      Pending normal aio reads: [0, 0, 0, 0] , aio writes: [0, 0, 0, 0] ,
       ibuf aio reads:, log i/o's:, sync i/o's:
      Pending flushes (fsync) log: 0; buffer pool: 0
      209 OS file reads, 4473 OS file writes, 1754 OS fsyncs
      0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
      -------------------------------------
      INSERT BUFFER AND ADAPTIVE HASH INDEX
      -------------------------------------
      Ibuf: size 1, free list len 0, seg size 2, 0 merges
      merged operations:
       insert 0, delete mark 0, delete 0
      discarded operations:
       insert 0, delete mark 0, delete 0
      Hash table size 34679, node heap has 0 buffer(s)
      Hash table size 34679, node heap has 0 buffer(s)
      Hash table size 34679, node heap has 0 buffer(s)
      Hash table size 34679, node heap has 0 buffer(s)
      Hash table size 34679, node heap has 0 buffer(s)
      Hash table size 34679, node heap has 0 buffer(s)
      Hash table size 34679, node heap has 1 buffer(s)
      Hash table size 34679, node heap has 1 buffer(s)
      15745.32 hash searches/s, 0.00 non-hash searches/s
      ---
      LOG
      ---
      Log sequence number 2926363
      Log flushed up to   2926284
      Pages flushed up to 2922665
      Last checkpoint at  2914385
      0 pending log flushes, 0 pending chkp writes
      1240 log i/o's done, 0.00 log i/o's/second
      ----------------------
      BUFFER POOL AND MEMORY
      ----------------------
      InnoDB: ###### Diagnostic info printed to the standard error stream
      2018-02-19  2:30:27 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 140046538405632 has waited at ha_innodb.cc line 13024 for 272.00 seconds the semaphore:
      X-lock on RW-latch at 0x5580c8f59680 created in file dict0dict.cc line 1109
      a writer (thread id 140046885218048) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 4191
      2018-02-19  2:30:27 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 140046884308736 has waited at dict0dict.cc line 498 for 248.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      2018-02-19  2:30:27 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 140046124443392 has waited at dict0dict.cc line 1003 for 272.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046538405632 has waited at ha_innodb.cc line 13024 for 272.00 seconds the semaphore:
      X-lock on RW-latch at 0x5580c8f59680 created in file dict0dict.cc line 1109
      a writer (thread id 140046885218048) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 4191
      --Thread 140046210385664 has waited at dict0dict.cc line 7195 for 13.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046884914944 has waited at dict0dict.cc line 1162 for 184.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046537799424 has waited at dict0dict.cc line 1162 for 217.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046884308736 has waited at dict0dict.cc line 498 for 248.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046538102528 has waited at dict0dict.cc line 498 for 187.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046124443392 has waited at dict0dict.cc line 1003 for 272.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      InnoDB: ###### Starts InnoDB Monitor for 30 secs to print diagnostic info:
      InnoDB: Pending reads 0, writes 0
      InnoDB: ###### Diagnostic info printed to the standard error stream
      2018-02-19  2:30:58 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 140046538405632 has waited at ha_innodb.cc line 13024 for 303.00 seconds the semaphore:
      X-lock on RW-latch at 0x5580c8f59680 created in file dict0dict.cc line 1109
      a writer (thread id 140046885218048) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 4191
      2018-02-19  2:30:58 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 140046537799424 has waited at dict0dict.cc line 1162 for 248.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      2018-02-19  2:30:58 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 140046884308736 has waited at dict0dict.cc line 498 for 279.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      2018-02-19  2:30:58 0 [Warning] InnoDB: A long semaphore wait:
      --Thread 140046124443392 has waited at dict0dict.cc line 1003 for 303.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046538405632 has waited at ha_innodb.cc line 13024 for 303.00 seconds the semaphore:
      X-lock on RW-latch at 0x5580c8f59680 created in file dict0dict.cc line 1109
      a writer (thread id 140046885218048) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: 0
      Last time write locked in file row0mysql.cc line 4191
      --Thread 140046210385664 has waited at dict0dict.cc line 7195 for 44.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046884914944 has waited at dict0dict.cc line 1162 for 215.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046537799424 has waited at dict0dict.cc line 1162 for 248.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046884308736 has waited at dict0dict.cc line 498 for 279.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046538102528 has waited at dict0dict.cc line 498 for 218.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      --Thread 140046124443392 has waited at dict0dict.cc line 1003 for 303.00 seconds the semaphore:
      Mutex at 0x5580c8f59730, Mutex DICT_SYS created dict0dict.cc:1098, lock var 2
      Last time reserved in file /home/travis/src/storage/innobase/row/row0mysql.cc line 2331
      InnoDB: ###### Starts InnoDB Monitor for 30 secs to print diagnostic info:
      InnoDB: Pending reads 0, writes 0
      InnoDB: ###### Diagnostic info printed to the standard error stream
      Status information:
      Current dir: /home/travis/logs/vardir1_1/data/
      Running threads: 12  Cached threads: 1  Stack size: 299008
      Key caches:
      default
      Buffer_size:     134217728
      Block_size:           1024
      Division_limit:        100
      Age_threshold:         300
      Partitions:              0
      blocks used:             8
      not flushed:             0
      w_requests:            504
      writes:                358
      r_requests:           1178
      reads:                  68
      handler status:
      read_key:         1283
      read_next:         125
      read_rnd             0
      read_first:         45
      write:            1000
      delete             150
      update:            219
      Table status:
      Opened tables:       1151
      Open tables:            0
      Open files:            29
      Open streams:           0
      Alarm status:
      Active alarms:   0
      Max used alarms: 0
      Next alarm time: 0
      Memory status:
      Non-mmapped space allocated from system: 35213312
      Number of free chunks:                   1266
      Number of fastbin blocks:                58
      Number of mmapped regions:               11
      Space in mmapped regions:                312356864
      Maximum total allocated space:           0
      Space available in freed fastbin blocks: 3648
      Total allocated space:                   25454464
      Total free space:                        9758848
      Top-most, releasable space:              15600
      Estimated memory (with thread stack):    351457280
      Global memory allocated by server:       281263424
      Memory allocated by threads:             792944
      Events status:
      LLA = Last Locked At  LUA = Last Unlocked At
      WOC = Waiting On Condition  DL = Data Locked
      Event scheduler status:
      State      : INITIALIZED
      Thread id  : 0
      LLA        : n/a:0
      LUA        : n/a:0
      WOC        : NO
      Workers    : 0
      Executed   : 0
      Data locked: NO
      Event queue status:
      Element count   : 0
      Data locked     : NO
      Attempting lock : NO
      LLA             : init_queue:140
      LUA             : init_queue:150
      WOC             : NO
      Next activation : never
      180219  2:33:28 [ERROR] mysqld got signal 11 ;
      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: 10.3.5-MariaDB-debug-log
      key_buffer_size=134217728
      read_buffer_size=131072
      max_used_connections=8
      max_threads=153
      thread_count=16
      It is possible that mysqld could use up to 
      key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467462 K  bytes of memory
      Hope that's ok; if not, decrease some variables in the equation.
      Thread pointer: 0x0
      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 = 0x0 thread_stack 0x49000
      /home/travis/server/bin/mysqld(my_print_stacktrace+0x40)[0x5580c67e8c4f]
      mysys/stacktrace.c:269(my_print_stacktrace)[0x5580c60159fb]
      /lib/x86_64-linux-gnu/libpthread.so.0(+0x10330)[0x7f5f38da9330]
      unix/syscall-template.S:81(__poll)[0x7f5f382a0c9d]
      sql/mysqld.cc:6674(handle_connections_sockets())[0x5580c5c349b1]
      sql/mysqld.cc:6147(mysqld_main(int, char**))[0x5580c5c33c77]
      sql/main.cc:26(main)[0x5580c5c28165]
      csu/libc-start.c:321(__libc_start_main)[0x7f5f381d1f45]
      /home/travis/server/bin/mysqld(+0x57e059)[0x5580c5c28059]
      The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
      information that should help you find out what is causing the crash.
      Writing a core file at /home/travis/logs/vardir1_1/data/
      Segmentation fault (core dumped)
      

      experimental 6b97ede2ef98c5ef90c2387528266f7fcde1685d

      perl /home/travis/rqg/runall-new.pl --duration=350 --threads=6 --seed=1519006890 --reporters=Backtrace,ErrorLog,Deadlock --validators=TransformerNoComparator --transformers=ExecuteAsCTE,ExecuteAsDeleteReturning,ExecuteAsExcept,ExecuteAsExecuteImmediate,ExecuteAsInsertSelect,ExecuteAsIntersect,ExecuteAsUnion,ExecuteAsUpdateDelete,ExecuteAsView,ExecuteAsPreparedTwice,ExecuteAsSPTwice --redefine=conf/mariadb/general-workarounds.yy --mysqld=--log_output=FILE --views --vcols --redefine=conf/mariadb/versioning.yy --redefine=conf/mariadb/alter_table.yy --redefine=conf/mariadb/bulk_insert.yy --redefine=conf/mariadb/sequences.yy --redefine=conf/mariadb/xa.yy --basedir=/home/travis/server --mysqld=--log_bin_trust_function_creators=1 --mysqld=--log-bin --mysqld=--max-statement-time=30 --mysqld=--loose-debug_assert_on_not_freed_memory=0 --grammar=conf/runtime/WL5004_sql.yy --gendata=conf/runtime/WL5004_data.zz --vardir=/home/travis/logs/vardir1_1
      

      Not reproducible so far.

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            elenst Elena Stepanova
            elenst Elena Stepanova
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