4206  gettid() = 4206
4206  +++ exited with 0 +++
4212  gettid() = 2 /* 4212 in strace's PID NS */
4212  +++ exited with 0 +++
4223  gettid() = 3 /* 4223 in strace's PID NS */
4223  +++ exited with 0 +++
4239  gettid() = 4 /* 4239 in strace's PID NS */
4239  +++ exited with 0 +++
4255  gettid() = 5 /* 4255 in strace's PID NS */
4255  +++ exited with 0 +++
