innodb.table_flags failed in buildbot with Operating system error number 2

innodb.table_flags '32k,xtradb'          w2 [ fail ]

        Test ended at 2017-10-06 14:25:35

CURRENT_TEST: innodb.table_flags

Server [mysqld.1 - pid: 28825, winpid: 28825, exit: 256] failed during test run

Server log from this test:

----------SERVER LOG START-----------

2017-10-06 14:24:28 140198879734016 [Note] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld (mysqld 10.1.29-MariaDB) starting as process 26834 ...

2017-10-06 14:24:28 140198879734016 [Warning] Could not increase number of max_open_files to more than 1024 (request: 4162)

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'SEQUENCE' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'partition' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] InnoDB:  innodb-page-size has been changed from the default value 16384 to 32768 .

innodb_open_files should not be greater than the open_files_limit.

2017-10-06 14:24:28 140198879734016 [Note] InnoDB: innodb_empty_free_list_algorithm has been changed to legacy because of small buffer pool size. In order to use backoff, increase buffer pool at least up to 20MB.

2017-10-06 14:24:28 140198879734016 [Note] InnoDB: Using mutexes to ref count buffer pool pages

2017-10-06 14:24:28 140198879734016 [Note] InnoDB: The InnoDB memory heap is disabled

2017-10-06 14:24:28 140198879734016 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

2017-10-06 14:24:28 140198879734016 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier

2017-10-06 14:24:28 140198879734016 [Note] InnoDB: Compressed tables use zlib 1.2.3

2017-10-06 14:24:28 140198879734016 [Note] InnoDB: Using Linux native AIO

2017-10-06 14:24:28 140198879734016 [Note] InnoDB: Using generic crc32 instructions

2017-10-06 14:24:28 140198879734016 [Note] InnoDB: Initializing buffer pool, size = 24.0M

2017-10-06 14:24:28 140198879734016 [Note] InnoDB: Completed initialization of buffer pool

2017-10-06 14:24:28 140198879734016 [Note] InnoDB: Highest supported file format is Barracuda.

2017-10-06 14:24:28 140198879734016 [Note] InnoDB: 128 rollback segment(s) are active.

2017-10-06 14:24:28 140198879734016 [Note] InnoDB: Waiting for purge to start

2017-10-06 14:24:28 140198879734016 [Note] InnoDB:  Percona XtraDB (http://www.percona.com) 5.6.36-82.2 started; log sequence number 3111409

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_SYS_DATAFILES' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_SYS_TABLESTATS' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_SYS_INDEXES' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'XTRADB_RSEG' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'CHANGED_PAGE_BITMAPS' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_FT_BEING_DELETED' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_LOCK_WAITS' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_TABLESPACES_ENCRYPTION' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'XTRADB_INTERNAL_HASH_TABLES' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_SYS_FIELDS' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_CMPMEM_RESET' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'FEEDBACK' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_CMP' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_FT_INDEX_TABLE' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_SYS_TABLESPACES' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_MUTEXES' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_CMP_RESET' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_FT_INDEX_CACHE' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_FT_DEFAULT_STOPWORD' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_SYS_COLUMNS' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_FT_CONFIG' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_CMP_PER_INDEX_RESET' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'XTRADB_READ_VIEW' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_SYS_SEMAPHORE_WAITS' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_CHANGED_PAGES' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_FT_DELETED' is disabled.

2017-10-06 14:24:28 140198879734016 [Note] Plugin 'INNODB_TABLESPACES_SCRUBBING' is disabled.

2017-10-06 14:24:28 140198879734016 [Warning] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: unknown variable 'loose-feedback-debug-startup-interval=20'

2017-10-06 14:24:28 140198879734016 [Warning] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: unknown variable 'loose-feedback-debug-first-interval=60'

2017-10-06 14:24:28 140198879734016 [Warning] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: unknown variable 'loose-feedback-debug-interval=60'

2017-10-06 14:24:28 140198879734016 [Warning] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: unknown option '--loose-pam-debug'

2017-10-06 14:24:28 140198879734016 [Warning] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: unknown variable 'loose-debug-sync-timeout=300'

2017-10-06 14:24:28 140198478345984 [Note] InnoDB: Dumping buffer pool(s) not yet started

2017-10-06 14:24:28 140198879734016 [Note] Server socket created on IP: '127.0.0.1'.

2017-10-06 14:24:28 140198879734016 [Note] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: ready for connections.

Version: '10.1.29-MariaDB'  socket: '/mnt/buildbot/build/mariadb-10.1.29/mysql-test/var/tmp/2/mysqld.1.sock'  port: 16000  MariaDB Server

2017-10-06 14:24:28 140198878706432 [Note] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: Normal shutdown

2017-10-06 14:24:28 140198878706432 [Note] Event Scheduler: Purging the queue. 0 events

2017-10-06 14:24:28 140198541256448 [Note] InnoDB: FTS optimize thread exiting.

2017-10-06 14:24:28 140198878706432 [Note] InnoDB: Starting shutdown...

2017-10-06 14:24:29 140198878706432 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool

2017-10-06 14:24:31 140198878706432 [Note] InnoDB: Shutdown completed; log sequence number 3111419

2017-10-06 14:24:31 140198878706432 [Note] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: Shutdown complete

2017-10-06 14:24:32 139922942531840 [Note] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld (mysqld 10.1.29-MariaDB) starting as process 26926 ...

2017-10-06 14:24:32 139922942531840 [Warning] Could not increase number of max_open_files to more than 1024 (request: 4162)

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'SEQUENCE' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'partition' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] InnoDB:  innodb-page-size has been changed from the default value 16384 to 32768 .

innodb_open_files should not be greater than the open_files_limit.

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: innodb_empty_free_list_algorithm has been changed to legacy because of small buffer pool size. In order to use backoff, increase buffer pool at least up to 20MB.

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Using mutexes to ref count buffer pool pages

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: The InnoDB memory heap is disabled

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Compressed tables use zlib 1.2.3

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Using Linux native AIO

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Using generic crc32 instructions

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Initializing buffer pool, size = 24.0M

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Completed initialization of buffer pool

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: The first specified data file /mnt/buildbot/build/mariadb-10.1.29/mysql-test/var/2/tmp/table_flags/ibdata1 did not exist: a new database to be created!

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Setting file /mnt/buildbot/build/mariadb-10.1.29/mysql-test/var/2/tmp/table_flags/ibdata1 size to 10 MB

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Setting log file /mnt/buildbot/build/mariadb-10.1.29/mysql-test/var/2/tmp/table_flags/ib_logfile101 size to 5 MB

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Setting log file /mnt/buildbot/build/mariadb-10.1.29/mysql-test/var/2/tmp/table_flags/ib_logfile1 size to 5 MB

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Renaming log file /mnt/buildbot/build/mariadb-10.1.29/mysql-test/var/2/tmp/table_flags/ib_logfile101 to /mnt/buildbot/build/mariadb-10.1.29/mysql-test/var/2/tmp/table_flags/ib_logfile0

2017-10-06 14:24:32 139922942531840 [Warning] InnoDB: New log files created, LSN=74143

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Doublewrite buffer not found: creating new

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Doublewrite buffer created

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: 128 rollback segment(s) are active.

2017-10-06 14:24:32 139922942531840 [Warning] InnoDB: Creating foreign key constraint system tables.

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Foreign key constraint system tables created

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Creating tablespace and datafile system tables.

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Tablespace and datafile system tables created.

2017-10-06 14:24:32 139922942531840 [Note] InnoDB: Waiting for purge to start

2017-10-06 14:24:32 139922942531840 [Note] InnoDB:  Percona XtraDB (http://www.percona.com) 5.6.36-82.2 started; log sequence number 0

2017-10-06 14:24:32 139922543474432 [Note] InnoDB: Dumping buffer pool(s) not yet started

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_SYS_DATAFILES' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_SYS_TABLESTATS' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_SYS_INDEXES' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'XTRADB_RSEG' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'CHANGED_PAGE_BITMAPS' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_FT_BEING_DELETED' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_LOCK_WAITS' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_TABLESPACES_ENCRYPTION' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'XTRADB_INTERNAL_HASH_TABLES' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_SYS_FIELDS' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_CMPMEM_RESET' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'FEEDBACK' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_CMP' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_FT_INDEX_TABLE' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_SYS_TABLESPACES' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_MUTEXES' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_CMP_RESET' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_FT_INDEX_CACHE' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_FT_DEFAULT_STOPWORD' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_SYS_COLUMNS' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_FT_CONFIG' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_CMP_PER_INDEX_RESET' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'XTRADB_READ_VIEW' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_SYS_SEMAPHORE_WAITS' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_CHANGED_PAGES' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_FT_DELETED' is disabled.

2017-10-06 14:24:32 139922942531840 [Note] Plugin 'INNODB_TABLESPACES_SCRUBBING' is disabled.

2017-10-06 14:24:32 139922942531840 [Warning] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: unknown variable 'loose-feedback-debug-startup-interval=20'

2017-10-06 14:24:32 139922942531840 [Warning] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: unknown variable 'loose-feedback-debug-first-interval=60'

2017-10-06 14:24:32 139922942531840 [Warning] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: unknown variable 'loose-feedback-debug-interval=60'

2017-10-06 14:24:32 139922942531840 [Warning] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: unknown option '--loose-pam-debug'

2017-10-06 14:24:32 139922942531840 [Warning] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: unknown variable 'loose-debug-sync-timeout=300'

2017-10-06 14:24:32 139922942531840 [Note] Server socket created on IP: '127.0.0.1'.

2017-10-06 14:24:32 139922942531840 [Note] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: ready for connections.

Version: '10.1.29-MariaDB'  socket: '/mnt/buildbot/build/mariadb-10.1.29/mysql-test/var/tmp/2/mysqld.1.sock'  port: 16000  MariaDB Server

2017-10-06 14:24:32 139922941504256 [Note] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld: Normal shutdown

2017-10-06 14:24:32 139922941504256 [Note] Event Scheduler: Purging the queue. 0 events

2017-10-06 14:24:32 139922614757120 [Note] InnoDB: FTS optimize thread exiting.

2017-10-06 14:24:32 139922941504256 [Note] InnoDB: Starting shutdown...

2017-10-06 14:24:33 139922941504256 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool

2017-10-06 14:25:33 140182751852800 [Note] /mnt/buildbot/build/mariadb-10.1.29/sql/mysqld (mysqld 10.1.29-MariaDB) starting as process 28826 ...

2017-10-06 14:25:33 140182751852800 [Warning] Could not increase number of max_open_files to more than 1024 (request: 4162)

2017-10-06 14:25:33 140182751852800 [Note] Plugin 'SEQUENCE' is disabled.

2017-10-06 14:25:33 140182751852800 [Note] Plugin 'partition' is disabled.

2017-10-06 14:25:33 140182751852800 [Note] InnoDB:  innodb-page-size has been changed from the default value 16384 to 32768 .

innodb_open_files should not be greater than the open_files_limit.

2017-10-06 14:25:33 140182751852800 [Note] InnoDB: innodb_empty_free_list_algorithm has been changed to legacy because of small buffer pool size. In order to use backoff, increase buffer pool at least up to 20MB.

2017-10-06 14:25:33 140182751852800 [Note] InnoDB: Using mutexes to ref count buffer pool pages

2017-10-06 14:25:33 140182751852800 [Note] InnoDB: The InnoDB memory heap is disabled

2017-10-06 14:25:33 140182751852800 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

2017-10-06 14:25:33 140182751852800 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier

2017-10-06 14:25:33 140182751852800 [Note] InnoDB: Compressed tables use zlib 1.2.3

2017-10-06 14:25:33 140182751852800 [Note] InnoDB: Using Linux native AIO

2017-10-06 14:25:33 140182751852800 [Note] InnoDB: Using generic crc32 instructions

2017-10-06 14:25:33 140182751852800 [Note] InnoDB: Initializing buffer pool, size = 24.0M

2017-10-06 14:25:33 140182751852800 [Note] InnoDB: Completed initialization of buffer pool

2017-10-06 14:25:33 140182751852800 [Note] InnoDB: Highest supported file format is Barracuda.

2017-10-06 14:25:33 140182751852800 [Note] InnoDB: The log sequence number 0 in ibdata file do not match the log sequence number 3103469 in the ib_logfiles!

2017-10-06 14:25:33 140182751852800 [ERROR] InnoDB: Attempted to open a previously opened tablespace. Previous tablespace test/tc uses space ID: 2 at filepath: ./test/tc.ibd. Cannot open tablespace mysql/innodb_index_stats which uses space ID: 2 at filepath: ./mysql/innodb_index_stats.ibd

2017-10-06 14:25:33 7f7ed720b900  InnoDB: Operating system error number 2 in a file operation.

InnoDB: The error means the system cannot find the path specified.

InnoDB: If you are installing InnoDB, remember that you must create

InnoDB: directories yourself, InnoDB does not create them.

InnoDB: Error: could not open single-table tablespace file ./mysql/innodb_index_stats.ibd

InnoDB: We do not continue the crash recovery, because the table may become

InnoDB: corrupt if we cannot apply the log records in the InnoDB log to it.

InnoDB: To fix the problem and start mysqld:

InnoDB: 1) If there is a permission problem in the file and mysqld cannot

InnoDB: open the file, you should modify the permissions.

InnoDB: 2) If the table is not needed, or you can restore it from a backup,

InnoDB: then you can remove the .ibd file, and InnoDB will do a normal

InnoDB: crash recovery and ignore that table.

InnoDB: 3) If the file system or the disk is broken, and you cannot remove

InnoDB: the .ibd file, you can set innodb_force_recovery > 0 in my.cnf

InnoDB: and force InnoDB to continue crash recovery here.

171006 14:25:33 [ERROR] mysqld got signal 6 ;

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: 10.1.29-MariaDB

key_buffer_size=1048576

read_buffer_size=131072

max_used_connections=0

max_threads=153

thread_count=0

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 62911 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 0x48400

/mnt/buildbot/build/mariadb-10.1.29/sql/mysqld(my_print_stacktrace+0x2e)[0x5586ef31443e]

/mnt/buildbot/build/mariadb-10.1.29/sql/mysqld(handle_fatal_signal+0x2f5)[0x5586eee5cf35]

/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f7ed5ad0390]

/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x38)[0x7f7ed50a0428]

/lib/x86_64-linux-gnu/libc.so.6(abort+0x16a)[0x7f7ed50a202a]

/mnt/buildbot/build/mariadb-10.1.29/sql/mysqld(+0x96edfe)[0x5586ef22bdfe]

/mnt/buildbot/build/mariadb-10.1.29/sql/mysqld(+0x8172df)[0x5586ef0d42df]

/mnt/buildbot/build/mariadb-10.1.29/sql/mysqld(+0x8a4c9d)[0x5586ef161c9d]

/mnt/buildbot/build/mariadb-10.1.29/sql/mysqld(+0x7bc8b2)[0x5586ef0798b2]

/mnt/buildbot/build/mariadb-10.1.29/sql/mysqld(_Z24ha_initialize_handlertonP13st_plugin_int+0x64)[0x5586eee5f6e4]

/mnt/buildbot/build/mariadb-10.1.29/sql/mysqld(+0x41f5d5)[0x5586eecdc5d5]

/mnt/buildbot/build/mariadb-10.1.29/sql/mysqld(_Z11plugin_initPiPPci+0x7ca)[0x5586eecdcf6a]

/mnt/buildbot/build/mariadb-10.1.29/sql/mysqld(+0x3774d0)[0x5586eec344d0]

/mnt/buildbot/build/mariadb-10.1.29/sql/mysqld(_Z11mysqld_mainiPPc+0x1b09)[0x5586eec37fb9]

/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f7ed508b830]

/mnt/buildbot/build/mariadb-10.1.29/sql/mysqld(_start+0x29)[0x5586eec2bb99]

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

----------SERVER LOG END-------------

mysqltest failed but provided no output