我们有一个 percona 集群，它在不同的集群节点上随机获取信号 11。我已经用尽了我所知道的一切。这是带有信号 11 的 .err 文件。
我们正在运行服务器版本：5.6.22-72.0-56 Percona XtraDB Cluster（GPL），版本 rel72.0，修订版 978，WSREP 版本 25.8，wsrep_25.8.r4150
11:01:11 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 XtraDB Cluster better by reporting any
bugs at https://bugs.launchpad.net/percona-xtradb-cluster
key_buffer_size=536870912
read_buffer_size=131072
max_used_connections=17
max_threads=153
thread_count=6
connection_count=3
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 585348 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.
Thread pointer: 0x4efe2a0
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 = 7fa21c1dfe50 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x8ccd9e]
/usr/sbin/mysqld(handle_fatal_signal+0x36c)[0x6828dc]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xf0a0)[0x7fa27a95e0a0]
/usr/sbin/mysqld(_ZN8MDL_lock11Ticket_list13remove_ticketEP10MDL_ticket+0x19)[0x6748c9]
/usr/sbin/mysqld(_ZN8MDL_lock13remove_ticketEMS_NS_11Ticket_listEP10MDL_ticket+0x46)[0x675066]
/usr/sbin/mysqld(_ZN11MDL_context12release_lockE17enum_mdl_durationP10MDL_ticket+0x1a)[0x675e5a]
/usr/sbin/mysqld(_ZN22Item_func_release_lock7val_intEv+0x13b)[0x62b3bb]
/usr/sbin/mysqld(_ZN4Item4sendEP8ProtocolP6String+0x15c)[0x5eb2cc]
/usr/sbin/mysqld(_ZN8Protocol19send_result_set_rowEP4ListI4ItemE+0xad)[0x67d76d]
/usr/sbin/mysqld(_ZN11select_send9send_dataER4ListI4ItemE+0x5f)[0x6c35ff]
/usr/sbin/mysqld(_ZN4JOIN4execEv+0x4d8)[0x6d90e8]
/usr/sbin/mysqld(_Z12mysql_selectP3THDP10TABLE_LISTjR4ListI4ItemEPS4_P10SQL_I_ListI8st_orderESB_S7_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x265)[0x71e645]
/usr/sbin/mysqld(_Z13handle_selectP3THDP13select_resultm+0x175)[0x71e8f5]
/usr/sbin/mysqld[0x59a85f]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0xb60)[0x6f8810]
/usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x5c8)[0x6fd7f8]
/usr/sbin/mysqld[0x6fd8f2]
/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x1076)[0x6fef36]
/usr/sbin/mysqld(_Z10do_commandP3THD+0x202)[0x6ffbe2]
/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x2ad)[0x6d11dd]
/usr/sbin/mysqld(handle_one_connection+0x42)[0x6d1262]
/usr/sbin/mysqld(pfs_spawn_thread+0x140)[0xb195d0]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x6b50)[0x7fa27a955b50]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fa278c4195d]
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (7fa24d0f7810): is an invalid pointer
Connection ID (thread ID): 19719
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.
谢谢！
答案1
我们发现的唯一解决方法是将版本从 5.6 降到 5.5。
此后再也没有出现过信号 11。
谢谢，
答案2
表锁定
Galera Cluster 不支持表锁定，因为它们与多主复制相冲突。因此，不支持 LOCK TABLES 和 UNLOCK TABLES 查询。出于同样的原因，这也适用于锁定函数，例如 GET_LOCK() 和 RELEASE_LOCK()...。
http://galeracluster.com/documentation-webpages/limitations.html