MariaDB Nodes "randomly" crashing

[Graham Green]

Perhaps this is just part of a known limitation with Galera with tables without primary keys. Going back to our developers to have them add a primary key to the table to see if that resolves our particular issue.
I am running 5.5.37-MariaDB-wsrep MariaDB Server, wsrep_25.10.r3980 on CentOS

Here is the error log output:

BF-BF X lock conflict

RECORD LOCKS space id 758201 page no 3 n bits 192 index `GEN_CLUST_INDEX` of table `aviationweek`.`penton_magazine_order_items` trx id 13D07782 lock_mode X locks rec but not gap

140620 10:09:30 [ERROR] mysqld got signal 6 ;

The table in question has no primary key;

CREATE TABLE `penton_magazine_order_items` (

  `list_id` int(10) unsigned NOT NULL,

  `article_id` int(10) unsigned NOT NULL,

  `weight` int(11) NOT NULL DEFAULT '0',

  `weight_in_issue` int(11) NOT NULL DEFAULT '0'

) ENGINE=InnoDB DEFAULT CHARSET=utf8

There have been bug reports of similar problems here

https://bugs.launchpad.net/percona-xtradb-cluster/+bug/1321767

and perhaps here

https://bugs.launchpad.net/codership-mysql/+bug/1280896

I will report back here if adding a PK to the table makes this issue go away.

[Graham Green]

It appears adding the primary key to the table in question resolved this problem for us.