Lptrace just hang

[demonguy]

When I use lptrace, i just simply run python lptrace -p 21640. But this command just hang forever.
When i add some print log in lptrace like this
`
signal.signal(signal.SIGINT, sigint_handler)

print("bbbbbbbbbb")
with open(fifo_name) as fd:
    print("ssssssssssss")
    while True:
        print("aaaaaaaa")
        data = fd.read()
        print(111111111111)
        if data != '':
            print data

print("mmmmmmmm")

`
it will only print "bbbbbbb", but not any other logs. Did i miss anything

[demonguy]

BTW, it will cause process "21640" die.
Actually 21640 is just listening socket, but after i running this command, my process just die, and cannot listen socket anymore

[jseakle]

it might be that you don't have gdb installed. this is unfortunately the behavior in that case.