LP #1680803: pt-mysql-summary may get stuck when Time: NULL in processlist

**Reported in Launchpad by Sveta Smirnova last update 18-04-2017 21:33:03

pt-mysql-summary hangs at the Processlist summary stage when connected to MariaDB 10.2.5:

sveta@Thinkie:~/src/percona-toolkit$ pt-mysql-summary --socket=/home/sveta/mysql_packages/mariadb-10.2.5-linux-x86_64/mysql-test/var/tmp/mysqld.1.sock --user=root

1. Percona Toolkit MySQL Summary Report #######################
   System time | 2017-04-07 10:33:54 UTC (local TZ: +03 +0300)
2. Instances ##################################################
   Port Data Directory Nice OOM Socket
   ===== ========================== ==== === ======
   16000 /home/sveta/mysql_packages/mariadb-10.2.5-linux-x86_64/mysql-test/var/mysqld.1/data 0 0 /home/sveta/mysql_packages/mariadb-10.2.5-linux-x86_64/mysql-test/var/tmp/mysqld.1.sock
   3306 /var/lib/mysql 0 0 /var/run/mysqld/mysqld.sock
   3371 /home/sveta/mysql_packages/Percona-XtraDB-Cluster-5.7.16-rel10-27.19.1.Linux.x86_64.ssl100/data1 0 0 /tmp/pxc1.sock
   3373 /home/sveta/mysql_packages/Percona-XtraDB-Cluster-5.7.16-rel10-27.19.1.Linux.x86_64.ssl100/data3 0 0 /tmp/pxc3.sock
   3374 /home/sveta/mysql_packages/Percona-XtraDB-Cluster-5.7.16-rel10-27.19.1.Linux.x86_64.ssl100/data4 0 0 /tmp/pxc4.sock
   3372 /home/sveta/mysql_packages/Percona-XtraDB-Cluster-5.7.16-rel10-27.19.1.Linux.x86_64.ssl100/data2 0 0 /tmp/pxc2.sock
3. MySQL Executable ###########################################
   Path to executable | ./bin/mysqld
   Has symbols | Yes
   Path to executable | /home/sveta/mysql_packages/mariadb-10.2.5-linux-x86_64/bin/mysqld
   Has symbols | Yes
   Path to executable | /usr/sbin/mysqld
   Has symbols | Yes
4. Report On Port 16000 #######################################
   User | root@localhost
   Time | 2017-04-07 13:33:54 (+03)
   Hostname | Thinkie
   Version | 10.2.5-MariaDB-log MariaDB Server
   Built On | Linux x86_64
   Started | 2017-04-07 13:31 (up 0+00:01:56)
   Databases | 5
   Datadir | /home/sveta/mysql_packages/mariadb-10.2.5-linux-x86_64/mysql-test/var/mysqld.1/data/
   Processes | 1 connected, 1 running
   Replication | Is not a slave, has 0 slaves connected
   Pidfile | /home/sveta/mysql_packages/mariadb-10.2.5-linux-x86_64/mysql-test/var/run/mysqld.1.pid (exists)
5. Processlist ################################################

Command COUNT Working SUM(Time) MAX(Time)
------------------------------ -------- ------- --------- ---------

^C2017_04_07_13_50_17 Caught signal, forcing exit

Tested with versions 2.2.20 and 3.0.2