) in polling mode reports the
second stopped event generated by the implied SIGSTOP of
PTRACE_ATTACH.

  st=19 c=05
  ^C

After the patch, the second event is not reported.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>
ʤUA”yx