key_buffer_size=268435456
read_buffer_size=1048576
max_used_connections=0
max_threads=500
thread_count=0
connection_count=0
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1291909 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 = 0 thread_stack 0x40000
/usr/sbin/mysqld(my_print_stacktrace+0x33)[0x7ff57f2c5793]
/usr/sbin/mysqld(handle_fatal_signal+0x3e4)[0x7ff57f1b2b44]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xf8d0)[0x7ff57e9b08d0]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x37)[0x7ff57d3a6147]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x148)[0x7ff57d3a7528]
/usr/sbin/mysqld(+0x52aa65)[0x7ff57f30ba65]
/usr/sbin/mysqld(+0x52c2e1)[0x7ff57f30d2e1]
/usr/sbin/mysqld(+0x5f93c2)[0x7ff57f3da3c2]
/usr/sbin/mysqld(+0x5ef5e7)[0x7ff57f3d05e7]
/usr/sbin/mysqld(+0x52d5d3)[0x7ff57f30e5d3]
/usr/sbin/mysqld(+0x51e4ac)[0x7ff57f2ff4ac]
/usr/sbin/mysqld(+0x522cb3)[0x7ff57f303cb3]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x80a4)[0x7ff57e9a90a4]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7ff57d4599cd]
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.
160622 09:31:52 mysqld_safe Number of processes running now: 0
160622 09:31:52 mysqld_safe mysqld restarted
160622  9:31:52 [Warning] 'THREAD_CONCURRENCY' is deprecated and will be removed in a future release.
160622  9:31:52 [Note] /usr/sbin/mysqld (mysqld 5.5.46-0+deb8u1) starting as process 16129 ...
160622  9:31:52 [Note] Plugin 'FEDERATED' is disabled.
160622  9:31:52 InnoDB: The InnoDB memory heap is disabled
160622  9:31:52 InnoDB: Mutexes and rw_locks use GCC atomic builtins
160622  9:31:52 InnoDB: Compressed tables use zlib 1.2.8
160622  9:31:52 InnoDB: Using Linux native AIO
160622  9:31:52 InnoDB: Initializing buffer pool, size = 128.0M
160622  9:31:52 InnoDB: Completed initialization of buffer pool
160622  9:31:52 InnoDB: highest supported file format is Barracuda.
InnoDB: The log sequence number in ibdata files does not match
InnoDB: the log sequence number in the ib_logfiles!
160622  9:31:52  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...
160622  9:31:52  InnoDB: Waiting for the background threads to start
160622  9:31:53 InnoDB: 5.5.46 started; log sequence number 1515417572
160622  9:31:53 InnoDB: !!! innodb_force_recovery is set to 1 !!!
160622  9:31:53 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
160622  9:31:53 [Note]   - '0.0.0.0' resolves to '0.0.0.0';
160622  9:31:53 [Note] Server socket created on IP: '0.0.0.0'.
160622  9:31:53 [Warning] 'user' entry '[email protected]' ignored in --skip-name-resolve mode.
160622  9:31:53 [Warning] 'proxies_priv' entry '@ [email protected]' ignored in --skip-name-resolve mode.
160622  9:31:53 [Note] Event Scheduler: Loaded 0 events
160622  9:31:53 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.5.46-0+deb8u1'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  (Debian)
160622  9:31:53  InnoDB: Assertion failure in thread 140470035228416 in file trx0purge.c line 840
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.
19:31:53 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=268435456
read_buffer_size=1048576
max_used_connections=0
max_threads=500
thread_count=0
connection_count=0
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1291909 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 = 0 thread_stack 0x40000
/usr/sbin/mysqld(my_print_stacktrace+0x33)[0x7fc1e1d02793]
/usr/sbin/mysqld(handle_fatal_signal+0x3e4)[0x7fc1e1befb44]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xf8d0)[0x7fc1e13ed8d0]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x37)[0x7fc1dfde3147]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x148)[0x7fc1dfde4528]
/usr/sbin/mysqld(+0x52aa65)[0x7fc1e1d48a65]
/usr/sbin/mysqld(+0x52c2e1)[0x7fc1e1d4a2e1]
/usr/sbin/mysqld(+0x5f93c2)[0x7fc1e1e173c2]
/usr/sbin/mysqld(+0x5ef5e7)[0x7fc1e1e0d5e7]
/usr/sbin/mysqld(+0x52d5d3)[0x7fc1e1d4b5d3]
/usr/sbin/mysqld(+0x51e4ac)[0x7fc1e1d3c4ac]
/usr/sbin/mysqld(+0x522cb3)[0x7fc1e1d40cb3]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x80a4)[0x7fc1e13e60a4]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fc1dfe969cd]
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.
160622 09:31:53 mysqld_safe Number of processes running now: 0
160622 09:31:53 mysqld_safe mysqld restarted
160622  9:31:53 [Warning] 'THREAD_CONCURRENCY' is deprecated and will be removed in a future release.
160622  9:31:53 [Note] /usr/sbin/mysqld (mysqld 5.5.46-0+deb8u1) starting as process 16187 ...