Connection stuck in Unlocking tables state

#

# This group is read both both by the client and the server

# use it for options that affect everything

#

[client-server]

#

# include all files from the config directory

#

!includedir /etc/my.cnf.d

[mysqld]

skip-name-resolve

datadir         = /home/mysql/

tmpdir          = /home/mysqltmp/

port            = 3306

socket          = /home/mysql/mysql.sock

# General #

log_error                      = /home/mysql/node1.err

default-storage-engine         = innodb

query_cache_limit              = 0

query_cache_size               = 0

query_cache_type               = 0

bind-address                   = 0.0.0.0

max-connections                = 500

max-allowed-packet             = 15M

table_open_cache               = 60000

tmp_table_size                 = 512M

#FTS

innodb_ft_result_cache_limit=256M

# Binlog #

binlog_format                  = ROW

sync_binlog                    = 0

# Galera #

wsrep_on=on

wsrep_provider=/usr/lib64/galera/libgalera_smm.so

wsrep_cluster_address="gcomm://xx.xx.xx.xx,xx.xx.xx.xx,xx.xx.xx.xx"

wsrep_cluster_name='galera_cluster'

wsrep_node_address='xx.xx.xx.xx'

wsrep_node_name='node1'

wsrep_provider_options="gcache.size=25G;gcs.fc_limit=4000;gcache.page_size=512M;gcs.fc_master_slave=YES;gcs.fc_factor=1.0;"

wsrep_sst_method=xtrabackup-v2

wsrep_sst_auth=xtrabackup:1111111

#Replication

gtid_domain_id=1

server_id=1

log_slave_updates=1

log_bin=binlog

expire_logs_days=2

# Innodb #

innodb_file_format             = BARRACUDA

innodb-flush-method            = O_DIRECT

innodb_autoinc_lock_mode       = 2

innodb_log_file_size           = 1G

innodb_log_buffer_size         = 512M

innodb_file_per_table          = 1

innodb_flush_log_at_trx_commit = 0

innodb_buffer_pool_size        = 100G

innodb_buffer_pool_instances   = 20

innodb_write_io_threads        = 16

innodb_read_io_threads         = 16

innodb_change_buffering        = all

transaction-isolation          = READ-COMMITTED

[sst]

compressor="pigz"

decompressor="pigz -d"