我有一个包含三个节点的PXC。但当其中一个节点崩溃时，其他节点也紧随其后。
下面的错误的第一段（试图获取一些变量......）意味着什么？在什么情况下这个错误或消息会发生？
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (7f7bf80f5c30): is an invalid pointer
Connection ID (thread ID): 323203618
Status: NOT_KILLED
You may download the Percona XtraDB Cluster operations manual by visiting
http://www.percona.com/software/percona-xtradb-cluster/. You may find information
in the manual which will help you identify the cause of the crash.
150809 05:13:51 mysqld_safe Number of processes running now: 0
150809 05:13:51 mysqld_safe WSREP: not restarting wsrep node automatically
150809 05:13:51 mysqld_safe mysqld from pid file /var/lib/mysql/db-3-2.pid ended