static_signal failing with timeout or strange output (non-det)

Failed once on CDash:

http://dynamorio.org/CDash/testDetails.php?test=168921&build=15987

Required regular expression not found.Regex=[^Sending SIGUSR1 pre-DR-init
Got SIGUSR1
pre-DR init
in dr_client_main
Sending SIGUSR1 pre-DR-start
Got SIGUSR1
pre-DR start
Sending SIGUSR1 under DR
Got SIGUSR1
pre-DR stop
Saw some bb events
Saw 1 signal\(s\)
Sending SIGUSR1 post-DR-stop
Got SIGUSR1
all done
$
]

Test output
Sending SIGUSR1 pre-DR-init
Got SIGUSR1
pre-DR init
in dr_client_main
Sending SIGUSR1 pre-DR-start
Got SIGUSR1
pre-DR start
Sending SIGUSR1 under DR
Got SIGUSR1
Saw some bb events
Saw 2 signal(s)