Merge 10.1 into 10.2

Docs/README-wsrep

@@ -269,9 +269,6 @@ innodb_autoinc_lock_mode=2
    autoinc lock modes 0 and 1 can cause unresolved deadlock, and make
    the system unresponsive.
 
-innodb_locks_unsafe_for_binlog=1
-   This option is required for parallel applying.
-
 5.2 WSREP OPTIONS
 
 All options are optional except for wsrep_provider, wsrep_cluster_address, and

plugin/wsrep_info/mysql-test/wsrep_info/my.cnf

@@ -5,7 +5,6 @@
 wsrep-on=1
 binlog-format=row
 innodb-autoinc-lock-mode=2
-innodb-locks-unsafe-for-binlog=1
 wsrep-cluster-address=gcomm://
 wsrep_provider=@ENV.WSREP_PROVIDER
 

sql/sql_show.cc

@@ -10014,8 +10014,6 @@ char *thd_get_error_context_description(THD *thd, char *buffer,
   char header[256];
   int len;
 
-  mysql_mutex_lock(&LOCK_thread_count);
-
   len= my_snprintf(header, sizeof(header),
                    "MySQL thread id %lu, OS thread handle %lu, query id %lu",
                    thd->thread_id, (ulong) thd->real_id, (ulong) thd->query_id);
@@ -10060,7 +10058,6 @@ char *thd_get_error_context_description(THD *thd, char *buffer,
     }
     mysql_mutex_unlock(&thd->LOCK_thd_data);
   }
-  mysql_mutex_unlock(&LOCK_thread_count);
 
   if (str.c_ptr_safe() == buffer)
     return buffer;