MySQL keep on crashing

Maybe that can help. My mysql logs are empty, but I do have some informations in the syslog :

Jul 26 06:01:34 etabli-srv mysqld: 2016-07-26  6:01:34 140044338588416 [ERROR] mysqld: Table './etabli/eta_options' is marked as crashed and should be repaired
Jul 26 06:01:34 etabli-srv mysqld: 2016-07-26  6:01:34 140044338588416 [ERROR] mysqld: Table 'eta_options' is marked as crashed and should be repaired
Jul 26 06:01:34 etabli-srv mysqld: 2016-07-26  6:01:34 140044338588416 [Warning] Checking table:   './etabli/eta_options'

I've tried to repair the table and mysql told my that worked :

MariaDB [etabli]> REPAIR TABLE eta_options;
+-----------------------------+--------+----------+----------+
| Table                       | Op     | Msg_type | Msg_text |
+-----------------------------+--------+----------+----------+
| etabli.eta_options | repair | status   | OK       |
+-----------------------------+--------+----------+----------+
1 row in set (27.25 sec)

But I still have that error when I restart mysql.

Another thing, I have some maybe useful informations :

Jul 26 05:59:22 etabli-srv kernel: [ 7212.865588] Out of memory: Kill process 19053 (mysqld) score 87 or sacrifice child
Jul 26 05:59:22 etabli-srv kernel: [ 7212.869330] Killed process 19053 (mysqld) total-vm:1480900kB, anon-rss:7472kB, file-rss:0kB
Jul 26 05:59:22 etabli-srv kernel: [ 7212.946056] php-fpm5.6 invoked oom-killer: gfp_mask=0x201da, order=0, oom_score_adj=0
Jul 26 05:59:22 etabli-srv kernel: [ 7212.946061] php-fpm5.6 cpuset=/ mems_allowed=0
Jul 26 05:59:22 etabli-srv kernel: [ 7212.946065] CPU: 0 PID: 19228 Comm: php-fpm5.6 Not tainted 3.13.0-71-generic #114-Ubuntu 

   Jul 26 06:04:14 etabli-srv mysqld: 2016-07-26  6:04:14 139816844740544 [ERROR] InnoDB: Cannot allocate memory for the buffer pool
    Jul 26 06:04:14 etabli-srv mysqld: 2016-07-26  6:04:14 139816844740544 [ERROR] Plugin 'InnoDB' init function returned error.
    Jul 26 06:04:14 etabli-srv mysqld: 2016-07-26  6:04:14 139816844740544 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
    Jul 26 06:04:14 etabli-srv mysqld: 2016-07-26  6:04:14 139816844740544 [Note] Plugin 'FEEDBACK' is disabled.
    Jul 26 06:04:14 etabli-srv mysqld: 2016-07-26  6:04:14 139816844740544 [ERROR] Unknown/unsupported storage engine: InnoDB
    Jul 26 06:04:14 etabli-srv mysqld: 2016-07-26  6:04:14 139816844740544 [ERROR] Aborting
    Jul 26 06:04:14 etabli-srv mysqld:
    Jul 26 06:04:14 etabli-srv mysqld_safe: mysqld from pid file /var/run/mysqld/mysqld.pid ended
    Jul 26 06:04:16 etabli-srv kernel: [ 7506.415304] php-fpm5.6 invoked oom-killer: gfp_mask=0x200da, order=0, oom_score_adj=0
    Jul 26 06:04:16 etabli-srv kernel: [ 7506.415321] php-fpm5.6 cpuset=/ mems_allowed=0

Free -m :

 total       used       free     shared    buffers     cached
Mem:           994        108        885          2          2         36
-/+ buffers/cache:         69        924
Swap:         1023         88        935