Server crash in SHOW SLAVE STATUS concurrent with STOP SLAVE

--source include/master-slave.inc

--connection slave1

send STOP SLAVE;

--connection slave

--sleep 0.5

send SHOW SLAVE STATUS;

--connection slave1

reap;

--sleep 0.5

START SLAVE;

--connection slave

reap;

--source include/rpl_end.inc

diff --git a/sql/slave.cc b/sql/slave.cc

index 6f4176f233d..3e4df0ff4e6 100644

--- a/sql/slave.cc

+++ b/sql/slave.cc

@@ -3343,8 +3343,10 @@ static bool send_show_master_info_data(THD *thd, Master_info *mi, bool full,

     // SQL_Remaining_Delay

     // THD::proc_info is not protected by any lock, so we read it once

     // to ensure that we use the same value throughout this function.

+    THD *sql_driver= mi->rli.sql_driver_thd;

+    my_sleep(2000000);

     const char *slave_sql_running_state=

-      mi->rli.sql_driver_thd ? mi->rli.sql_driver_thd->proc_info : "";

+      sql_driver ? sql_driver->proc_info : "";

     if (slave_sql_running_state == stage_sql_thd_waiting_until_delay.m_name)

     {

       time_t t= my_time(0), sql_delay_end= mi->rli.get_sql_delay_end();

@@ -5839,6 +5841,7 @@ pthread_handler_t handle_slave_sql(void *arg)

     could be used by slave through Relay_log_info::save_temporary_tables.

   */

   thd->temporary_tables= 0;

+my_sleep(1000000);

   rli->sql_driver_thd= 0;

   thd->rgi_fake= thd->rgi_slave= NULL;