crash on no connection

2017-04-20 13:35:52 notice : MaxScale started with 1 server threads.
2017-04-20 13:35:55 notice : Loaded module MySQLAuth: V1.0.0 from /usr/lib64/maxscale/libMySQLAuth.so
2017-04-20 13:36:02 notice : Loaded module MySQLBackend: V2.0.0 from /usr/lib64/maxscale/libMySQLBackend.so
2017-04-20 13:36:26 error : Monitor timed out when connecting to server XXX.XXX.XXX.XXX:3306 : "Lost connection to MySQL server at 'handshake: waiting for inital communication packet', system error: 110"
2017-04-20 13:36:26 notice : Server XXX.XXX.XXX.XXX:3306 lost the master status.
2017-04-20 13:36:32 error : Monitor timed out when connecting to server XXX.XXX.XXX.XXX:3306 : "Lost connection to MySQL server at 'handshake: waiting for inital communication packet', system error: 110"
2017-04-20 13:36:32 notice : Server changed state: devmdbc1[XXX.XXX.XXX.XXX:3306]: master_down. [Master, Running] -> [Down]
2017-04-20 13:36:32 error : Fatal: MaxScale 2.0.1 received fatal signal 6. Attempting backtrace.
2017-04-20 13:36:32 error : Commit ID: fa2a66719554d13a00db5c81c5c9ffd5b3a2ce14 System name: Linux Release string: CentOS release 6.8 (Final)
2017-04-20 13:36:32 error : /usr/bin/maxscale() [0x403b9c]
2017-04-20 13:36:32 error : /lib64/libpthread.so.0() [0x325720f7e0]
2017-04-20 13:36:32 error : /lib64/libc.so.6(gsignal+0x35) [0x3256e325e5]
2017-04-20 13:36:32 error : /lib64/libc.so.6(abort+0x175) [0x3256e33dc5]
2017-04-20 13:36:32 error : /lib64/libc.so.6() [0x3256e704f7]
2017-04-20 13:36:32 error : /lib64/libc.so.6() [0x3256e75f3e]
2017-04-20 13:36:32 error : /lib64/libc.so.6() [0x3256e78d8d]
2017-04-20 13:36:32 error : /usr/lib64/maxscale/libmaxscale-common.so.1.0.0(externcmd_substitute_arg+0xf6) [0x39bb238b99]
2017-04-20 13:36:32 error : /usr/lib64/maxscale/libmaxscale-common.so.1.0.0(monitor_launch_script+0x34a) [0x39bb244a02]
2017-04-20 13:36:32 error : /usr/lib64/maxscale/libmysqlmon.so(+0x37ab) [0x7ff09f2847ab]
2017-04-20 13:36:32 error : /lib64/libpthread.so.0() [0x3257207aa1]
2017-04-20 13:36:32 error : /lib64/libc.so.6(clone+0x6d) [0x3256ee8aad]