mysqld got signal 11


My last apt-get upgrade to percona-server-server 5.6.21-70.0-688.utopic from what I thought was an earlier release in the 5.6 series, maybe 5.6.19 is causing mysql to crash.

I can’t put my finger on what is making mysql crash. What seems clear is that is range of different SQL and DML operations cause a crash, and they are all repeatable. For example, this DML statement causes a signal 11:

CREATE TABLE IF NOT EXISTS sessions ( id varchar(64) character set utf8 NOT NULL, access int(10) unsigned default NULL, data text character set utf8, user_id int(10) unsigned default NULL, start INT(10) UNSIGNED NOT NULL, secure TINYINT(1) UNSIGNED NOT NULL DEFAULT 0, PRIMARY KEY (id), KEY user_id (user_id), [B] INDEX start (start ASC), CONSTRAINT sessions_ibfk_1 FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE ON UPDATE CASCADE ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_general_ci;

I can’t run this statement in an existing schema or new one. The crash looks like this: [/B]

18:41:38 UTC - mysqld got signal 11 ;
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.
Please help us make Percona Server better by reporting any
bugs at

It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 77372 K bytes of memory
Hope that’s ok; if not, decrease some variables in the equation.

Thread pointer: 0x3a87780
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 = 7f071bf60e60 thread_stack 0x30000

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (7f06fc004f70): is an invalid pointer
Connection ID (thread ID): 1

You may download the Percona Server operations manual by visiting You may find information
in the manual which will help you identify the cause of the crash.
141107 14:41:39 mysqld_safe Number of processes running now: 0
141107 14:41:39 mysqld_safe mysqld restarted
2014-11-07 14:41:39 0 [Warning] Using unique option prefix key_buffer instead of key_buffer_size is deprecated and will be removed in a future release. Please use the full name instead.
2014-11-07 14:41:39 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2014-11-07 14:41:39 19883 [Warning] Using unique option prefix myisam-recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the full name instead.
2014-11-07 14:41:39 19883 [Note] Plugin ‘FEDERATED’ is disabled.
2014-11-07 14:41:39 7f862c14f780 InnoDB: Warning: Using innodb_additional_mem_pool_size is DEPRECATED. This option may be removed in future releases, together with the option innodb_use_sys_malloc and with the InnoDB’s internal memory allocator.
2014-11-07 14:41:39 19883 [Note] InnoDB: Using atomics to ref count buffer pool pages
2014-11-07 14:41:39 19883 [Note] InnoDB: The InnoDB memory heap is disabled
2014-11-07 14:41:39 19883 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2014-11-07 14:41:39 19883 [Note] InnoDB: Memory barrier is not used
2014-11-07 14:41:39 19883 [Note] InnoDB: Compressed tables use zlib 1.2.8
2014-11-07 14:41:39 19883 [Note] InnoDB: Using Linux native AIO
2014-11-07 14:41:39 19883 [Note] InnoDB: Using CPU crc32 instructions
2014-11-07 14:41:39 19883 [Note] InnoDB: Initializing buffer pool, size = 500.0M
2014-11-07 14:41:39 19883 [Note] InnoDB: Completed initialization of buffer pool
2014-11-07 14:41:39 19883 [Note] InnoDB: Highest supported file format is Barracuda.
2014-11-07 14:41:39 19883 [Note] InnoDB: The log sequence numbers 3677334509 and 3677334509 in ibdata files do not match the log sequence number 3677335208 in the ib_logfiles!
2014-11-07 14:41:39 19883 [Note] InnoDB: Database was not shutdown normally!
2014-11-07 14:41:39 19883 [Note] InnoDB: Starting crash recovery.
2014-11-07 14:41:39 19883 [Note] InnoDB: Reading tablespace information from the .ibd files…
2014-11-07 14:41:40 19883 [Note] InnoDB: Restoring possible half-written data pages
2014-11-07 14:41:40 19883 [Note] InnoDB: from the doublewrite buffer…
InnoDB: Last MySQL binlog file position 0 4738636, file name ./mysql-bin.001446
2014-11-07 14:41:40 19883 [Note] InnoDB: 128 rollback segment(s) are active.
2014-11-07 14:41:40 19883 [Note] InnoDB: Waiting for purge to start
2014-11-07 14:41:40 19883 [Note] InnoDB: Percona XtraDB ( 5.6.21-70.0 started; log sequence number 3677335208
2014-11-07 14:41:40 19883 [Note] RSA private key file not found: /var/lib/mysql//private_key.pem. Some authentication plugins will not work.
2014-11-07 14:41:40 19883 [Note] RSA public key file not found: /var/lib/mysql//public_key.pem. Some authentication plugins will not work.
2014-11-07 14:41:40 19883 [Note] Server hostname (bind-address): ‘’; port: 3306
2014-11-07 14:41:40 19883 [Note] - ‘’ resolves to ‘’;
2014-11-07 14:41:40 19883 [Note] Server socket created on IP: ‘’.
2014-11-07 14:41:40 19883 [Warning] ‘user’ entry ‘root@goldman’ ignored in --skip-name-resolve mode.
2014-11-07 14:41:40 19883 [Warning] ‘proxies_priv’ entry ‘@ root@goldman’ ignored in --skip-name-resolve mode.
2014-11-07 14:41:40 19883 [Note] Event Scheduler: Loaded 0 events
2014-11-07 14:41:40 19883 [Note] /usr/sbin/mysqld: ready for connections.

Anyone else experiencing this?

Thanks for the feedback,



For the time being I downgraded to the bundled version of ubuntu utopic mysql-server 5.6.19. I’ll give percona 5.6 a go again with the next release