If you have pressed CTRL+Z and a process is suspended, then you use gdb

to attach to the process, it is surprising that the process is resumed
without inputting any gdb commands, however ptrace manual said:
  The tracing process will see the newly-traced process stop and may
  then control it as if it had been traced all along.
But the current code does not work in this way, unless traced process
received a signal later, it will continue to run as a background task.
To fix this problem, just send signal SIGSTOP to the traced process after
we resumed it, this works like that you are attaching to a running process,
it is not perfect but better than nothing.

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