2019-12-16 05:16:43 7f21f7360700  InnoDB: Assertion failure in thread 139783858161408 in file btr0pcur.cc line 432
InnoDB: Failing assertion: btr_page_get_prev(next_page, mtr) == buf_block_get_page_no(btr_pcur_get_block(cursor))
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to http://bugs.mysql.com.
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.6/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.
21:16:43 UTC - 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.
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.

key_buffer_size=8388608
read_buffer_size=131072
max_used_connections=1
max_threads=151
thread_count=1
connection_count=1
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 68109 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x2879060
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 = 7f21f735fe18 thread_stack 0x40000
/usr/sbin/mysqld(my_print_stacktrace+0x35)[0x8e82e5]
/usr/sbin/mysqld(handle_fatal_signal+0x494)[0x669714]
/lib64/libpthread.so.0(+0xf7e0)[0x7f2221b2d7e0]
/lib64/libc.so.6(gsignal+0x35)[0x7f22205cd495]
/lib64/libc.so.6(abort+0x175)[0x7f22205cec75]
/usr/sbin/mysqld[0xa94d83]
/usr/sbin/mysqld[0xa37514]
/usr/sbin/mysqld[0xa3a54b]
/usr/sbin/mysqld[0x99882c]
/usr/sbin/mysqld(_ZN7handler11ha_rnd_nextEPh+0x65)[0x5a8615]
/usr/sbin/mysqld(_Z13rr_sequentialP11READ_RECORD+0x1e)[0x81c8fe]
/usr/sbin/mysqld(_Z10sub_selectP4JOINP13st_join_tableb+0x179)[0x6c6989]
/usr/sbin/mysqld(_ZN4JOIN4execEv+0x3da)[0x6c59ea]
/usr/sbin/mysqld(_Z12mysql_selectP3THDP10TABLE_LISTjR4ListI4ItemEPS4_P10SQL_I_ListI8st_orderESB_S7_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x250)[0x70afc0]
/usr/sbin/mysqld(_Z13handle_selectP3THDP13select_resultm+0x19f)[0x70b85f]
/usr/sbin/mysqld[0x6e50bd]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x27ee)[0x6e8b3e]
/usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x370)[0x6eb540]
/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x112e)[0x6ec77e]
/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0xcf)[0x6b815f]
/usr/sbin/mysqld(handle_one_connection+0x47)[0x6b8287]
/usr/sbin/mysqld(pfs_spawn_thread+0x12d)[0x98409d]
/lib64/libpthread.so.0(+0x7aa1)[0x7f2221b25aa1]
/lib64/libc.so.6(clone+0x6d)[0x7f2220683bcd]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (7f21c8006c90): is an invalid pointer
Connection ID (thread ID): 2
Status: NOT_KILLED

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.
2019-12-16 05:16:44 28933 [Note] Plugin 'FEDERATED' is disabled.
2019-12-16 05:16:44 28933 [Note] InnoDB: Using atomics to ref count buffer pool pages
2019-12-16 05:16:44 28933 [Note] InnoDB: The InnoDB memory heap is disabled
2019-12-16 05:16:44 28933 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2019-12-16 05:16:44 28933 [Note] InnoDB: Memory barrier is not used
2019-12-16 05:16:44 28933 [Note] InnoDB: Compressed tables use zlib 1.2.11
2019-12-16 05:16:44 28933 [Note] InnoDB: Using Linux native AIO
2019-12-16 05:16:44 28933 [Note] InnoDB: Not using CPU crc32 instructions
2019-12-16 05:16:44 28933 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2019-12-16 05:16:44 28933 [Note] InnoDB: Completed initialization of buffer pool
2019-12-16 05:16:44 28933 [Note] InnoDB: Highest supported file format is Barracuda.
2019-12-16 05:16:44 28933 [Note] InnoDB: The log sequence numbers 905825208157 and 905825208157 in ibdata files do not match the log sequence number 905825347990 in the ib_logfiles!
2019-12-16 05:16:44 28933 [Note] InnoDB: Database was not shutdown normally!
2019-12-16 05:16:44 28933 [Note] InnoDB: Starting crash recovery.
2019-12-16 05:16:44 28933 [Note] InnoDB: Reading tablespace information from the .ibd files...
2019-12-16 05:16:44 28933 [Note] InnoDB: Restoring possible half-written data pages
2019-12-16 05:16:44 28933 [Note] InnoDB: from the doublewrite buffer...
2019-12-16 05:16:44 28933 [Note] InnoDB: 128 rollback segment(s) are active.
2019-12-16 05:16:44 28933 [Note] InnoDB: Waiting for purge to start
2019-12-16 05:16:44 28933 [Note] InnoDB: 5.6.45 started; log sequence number 905825347990
2019-12-16 05:16:44 28933 [Note] Server hostname (bind-address): '*'; port: 3306
2019-12-16 05:16:44 28933 [Note] IPv6 is available.
2019-12-16 05:16:44 28933 [Note]   - '::' resolves to '::';
2019-12-16 05:16:44 28933 [Note] Server socket created on IP: '::'.
2019-12-16 05:16:44 28933 [Note] Event Scheduler: Loaded 0 events
2019-12-16 05:16:44 28933 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.6.45'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MySQL Community Server (GPL)