# master state jumping from _STATE_AWAITING_MUX to _STATE_RUNNING
# call args: ['/usr/bin/ssh','-O','check','-T','-S','.libnet-openssh-perl/root-10.116.244.112-29033-578444','-l','root','10.116.244.112','--']
# open_ex: ['/usr/bin/ssh','-O','check','-T','-S','.libnet-openssh-perl/root-10.116.244.112-29033-578444','-l','root','10.116.244.112','--']
# io3 mloop, cin: 0, cout: 1, cerr: 0
# io3 fast, cin: 0, cout: 1, cerr: 0
# stdout, bytes read: 28 at offset 0
#> 4d 61 73 74 65 72 20 72 75 6e 6e 69 6e 67 20 28 70 69 64 3d 32 39 37 33 35 29 0d 0a             | Master running (pid=29735)..
# io3 fast, cin: 0, cout: 1, cerr: 0
# stdout, bytes read: 0 at offset 28
# leaving _io3()
# _waitpid(29741) => pid: 29741, rc: 0, err:
# sending exit control to master
# call args: ['/usr/bin/ssh','-O','exit','-T','-S','.libnet-openssh-perl/root-10.116.244.112-29033-578444','-F','/dev/null','10.116.244.112','--']
# open_ex: ['/usr/bin/ssh','-O','exit','-T','-S','.libnet-openssh-perl/root-10.116.244.112-29033-578444','-F','/dev/null','10.116.244.112','--']