[libvirt] Track an error

Hi there, Just a silly question, do we have a simpler way of checking where exactly a test is failing.The tests are failing after hacking stuff around. I have this error ../build-aux/test-driver: line 95: 20128 Segmentation fault "$@"

$log_file 2>&1

Yes am having a segfault! I don't know how to track it, well, I could review the whole file but is there some other method I am missing.Could you help me interpret the error, what does 20128 stand for?