在 中man ps，它清楚地说明了进程在 Linux 上可以具有的不同状态。
D Uninterruptible sleep (usually IO)
R Running or runnable (on run queue)
S Interruptible sleep (waiting for an event to complete)
T Stopped, either by a job control signal or because it is being traced.
W paging (not valid since the 2.6.xx kernel)
X dead (should never be seen)
Z Defunct ("zombie") process, terminated but not reaped by its parent.
即使X是一个进程状态，它也不应该被看到。但这是正确的吗？是否有一种理论上的方法可以将其视为过程中的状态？还是完全100%不可能？