InnoDB fails to shut down purge workers, causing hang

CURRENT_TEST: innodb_fts.innodb_fts_plugin

2017-09-08 14:13:13 0 [Note] /mnt/buildbot/build/mariadb-10.3.2/sql/mysqld (root[root] @ localhost []): Normal shutdown

2017-09-08 14:13:13 0 [Note] InnoDB: FTS optimize thread exiting.

2017-09-08 14:13:13 0 [Note] Event Scheduler: Purging the queue. 0 events

2017-09-08 14:13:13 0 [Note] InnoDB: Starting shutdown...

2017-09-08 14:13:13 0 [Note] InnoDB: Dumping buffer pool(s) to /dev/shm/var_auto_Jb6A/2/mysqld.1/data/ib_buffer_pool

2017-09-08 14:13:13 0 [Note] InnoDB: Instance 0, restricted to 127 pages due to innodb_buf_pool_dump_pct=25

2017-09-08 14:13:13 0 [Note] InnoDB: Buffer pool(s) dump completed at 170908 14:13:13

2017-09-08 14:13:14 0 [Note] InnoDB: Shutdown completed; log sequence number 167888018

2017-09-08 14:13:14 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"

2017-09-08 14:13:14 0 [Note] /mnt/buildbot/build/mariadb-10.3.2/sql/mysqld: Shutdown complete

"2017-09-08 14:13:16 0 [Note] /mnt/buildbot/build/mariadb-10.3.2/sql/mysqld (mysqld 10.3.2-MariaDB-log) starting as process 5693 ...

2017-09-08 14:13:16 0 [Warning] Could not increase number of max_open_files to more than 1024 (request: 4162)

2017-09-08 14:13:16 0 [Note] Plugin 'partition' is disabled.

2017-09-08 14:13:16 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

2017-09-08 14:13:16 0 [Note] InnoDB: Uses event mutexes

2017-09-08 14:13:16 0 [Note] InnoDB: Compressed tables use zlib 1.2.3

2017-09-08 14:13:16 0 [Note] InnoDB: Using Linux native AIO

2017-09-08 14:13:16 0 [Note] InnoDB: Number of pools: 1

2017-09-08 14:13:16 0 [Note] InnoDB: Using generic crc32 instructions

2017-09-08 14:13:16 0 [Note] InnoDB: Initializing buffer pool, total size = 8M, instances = 1, chunk size = 8M

2017-09-08 14:13:16 0 [Note] InnoDB: Completed initialization of buffer pool

2017-09-08 14:13:16 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().

2017-09-08 14:13:16 0 [Note] InnoDB: 128 out of 128 rollback segments are active.

2017-09-08 14:13:16 0 [Note] InnoDB: Creating shared tablespace for temporary tables

2017-09-08 14:13:16 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...

2017-09-08 14:13:16 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.

2017-09-08 14:13:16 0 [Note] InnoDB: Waiting for purge to start

2017-09-08 14:13:16 0 [Note] InnoDB: 5.7.19 started; log sequence number 167888018

2017-09-08 14:13:16 0 [Note] Plugin 'SEQUENCE' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_SYS_DATAFILES' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_SYS_TABLESTATS' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_TABLESPACES_SCRUBBING' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_CMP' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_FT_DELETED' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_CMP_RESET' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_LOCK_WAITS' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_TABLESPACES_ENCRYPTION' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_CMPMEM_RESET' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'FEEDBACK' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_FT_INDEX_TABLE' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_CMP_PER_INDEX_RESET' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'user_variables' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_FT_INDEX_CACHE' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_FT_BEING_DELETED' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_FT_DEFAULT_STOPWORD' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_FT_CONFIG' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_SYS_TABLESPACES' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_MUTEXES' is disabled.

2017-09-08 14:13:16 0 [Note] Plugin 'INNODB_SYS_SEMAPHORE_WAITS' is disabled.

2017-09-08 14:13:16 0 [Warning] /mnt/buildbot/build/mariadb-10.3.2/sql/mysqld: unknown variable 'loose-feedback-debug-startup-interval=20'

2017-09-08 14:13:16 0 [Warning] /mnt/buildbot/build/mariadb-10.3.2/sql/mysqld: unknown variable 'loose-feedback-debug-first-interval=60'

2017-09-08 14:13:16 0 [Warning] /mnt/buildbot/build/mariadb-10.3.2/sql/mysqld: unknown variable 'loose-feedback-debug-interval=60'

2017-09-08 14:13:16 0 [Warning] /mnt/buildbot/build/mariadb-10.3.2/sql/mysqld: unknown option '--loose-pam-debug'

2017-09-08 14:13:16 0 [Warning] /mnt/buildbot/build/mariadb-10.3.2/sql/mysqld: unknown variable 'loose-debug-sync-timeout=300'

2017-09-08 14:13:16 0 [Note] InnoDB: Loading buffer pool(s) from /dev/shm/var_auto_Jb6A/2/mysqld.1/data/ib_buffer_pool

2017-09-08 14:13:16 0 [Note] InnoDB: Buffer pool(s) load completed at 170908 14:13:16

2017-09-08 14:13:16 0 [Note] Server socket created on IP: '127.0.0.1'.

2017-09-08 14:13:16 0 [Note] Reading of all Master_info entries succeded

2017-09-08 14:13:16 0 [Note] Added new Master_info '' to hash table

2017-09-08 14:13:16 0 [Note] /mnt/buildbot/build/mariadb-10.3.2/sql/mysqld: ready for connections.

Version: '10.3.2-MariaDB-log'  socket: '/mnt/buildbot/build/mariadb-10.3.2/mysql-test/var/tmp/2/mysqld.1.sock'  port: 16020  MariaDB Server

2017-09-08 14:13:16 0 [Note] /mnt/buildbot/build/mariadb-10.3.2/sql/mysqld (root[root] @ localhost []): Normal shutdown

2017-09-08 14:13:16 0 [Note] Event Scheduler: Purging the queue. 0 events

2017-09-08 14:13:16 0 [Note] InnoDB: FTS optimize thread exiting.

170908 14:14:16 [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: 10.3.2-MariaDB-log

key_buffer_size=1048576

read_buffer_size=131072

max_used_connections=1

max_threads=153

thread_count=3

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 63038 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

/mnt/buildbot/build/mariadb-10.3.2/sql/mysqld(my_print_stacktrace+0x2e)[0x55d16586fcee]

/mnt/buildbot/build/mariadb-10.3.2/sql/mysqld(handle_fatal_signal+0x307)[0x55d165308f67]

/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f123a020390]

/lib/x86_64-linux-gnu/libpthread.so.0(pthread_cond_wait+0xc0)[0x7f123a01c360]

/mnt/buildbot/build/mariadb-10.3.2/sql/mysqld(_Z11mysqld_mainiPPc+0x1232)[0x55d1650b0372]

/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f12395db830]

/mnt/buildbot/build/mariadb-10.3.2/sql/mysqld(_start+0x29)[0x55d1650a2b89]

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.