160816 09:36:29 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
160816  9:36:29 [Note] /usr/libexec/mysqld (mysqld 5.5.50-MariaDB) starting as process 3507 ...
160816  9:36:29 InnoDB: The InnoDB memory heap is disabled
160816  9:36:29 InnoDB: Mutexes and rw_locks use GCC atomic builtins
160816  9:36:29 InnoDB: Compressed tables use zlib 1.2.7
160816  9:36:29 InnoDB: Using Linux native AIO
160816  9:36:29 InnoDB: Initializing buffer pool, size = 128.0M
160816  9:36:29 InnoDB: Completed initialization of buffer pool
160816  9:36:29 InnoDB: highest supported file format is Barracuda.
InnoDB: Log scan progressed past the checkpoint lsn 18647449
160816  9:36:29  InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
InnoDB: Doing recovery: scanned up to log sequence number 18647459
160816  9:36:29  InnoDB: Waiting for the background threads to start
160816  9:36:29  InnoDB: Assertion failure in thread 140100604172032 in file trx0purge.c line 848
InnoDB: Failing assertion: purge_sys->purge_trx_no <= purge_sys->rseg->last_trx_no
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/5.5/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.
160816  9:36:29 [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 http://kb.askmonty.org/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: 5.5.50-MariaDB
key_buffer_size=134217728
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 = 466712 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0x0
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 0x48000
/usr/libexec/mysqld(my_print_stacktrace+0x3d)[0x7f6bd8163acd]
/usr/libexec/mysqld(handle_fatal_signal+0x515)[0x7f6bd7d77665]
/lib64/libpthread.so.0(+0xf100)[0x7f6bd74a6100]
/lib64/libc.so.6(gsignal+0x37)[0x7f6bd5c575f7]
/lib64/libc.so.6(abort+0x148)[0x7f6bd5c58ce8]
/usr/libexec/mysqld(+0x65b3df)[0x7f6bd7f323df]
/usr/libexec/mysqld(+0x65c019)[0x7f6bd7f33019]
/usr/libexec/mysqld(+0x75ea44)[0x7f6bd8035a44]
/usr/libexec/mysqld(+0x7537b5)[0x7f6bd802a7b5]
/usr/libexec/mysqld(+0x65e219)[0x7f6bd7f35219]
/usr/libexec/mysqld(+0x652186)[0x7f6bd7f29186]
/lib64/libpthread.so.0(+0x7dc5)[0x7f6bd749edc5]
/lib64/libc.so.6(clone+0x6d)[0x7f6bd5d18ced]
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.
160816 09:36:29 mysqld_safe mysqld from pid file /var/run/mariadb/mariadb.pid ended