6820  gettid() = 6820
6820  +++ exited with 0 +++
6822  gettid() = 2 /* 6822 in strace's PID NS */
6822  +++ exited with 0 +++
6823  gettid() = 3 /* 6823 in strace's PID NS */
6823  +++ exited with 0 +++
6824  gettid() = 4 /* 6824 in strace's PID NS */
6824  +++ exited with 0 +++
6825  gettid() = 5 /* 6825 in strace's PID NS */
6825  +++ exited with 0 +++
