如果当我挂起到 ram 时进程正在积极使用 NFS，我会得到：
[34174.245400] PM: suspend entry (s2idle)
[34174.261634] Filesystems sync: 0.016 seconds
[34174.261917] Freezing user space processes ...
[34194.267178] Freezing of tasks failed after 20.005 seconds (1 tasks refusing to freeze, wq_busy=0):
[34194.267527] task:yt-dlp state:D stack: 0 pid:387124 ppid:289995 flags:0x00004006
但是，如果我首先挂起（CTRL-Z）进程，则一切正常：我不必终止进程或卸载。
为什么？有没有办法告诉 suspend-to-ram 暂停任何遇到冻结问题的进程？
$ uname -a
Linux aspire 5.15.0-43-generic #46-Ubuntu SMP Tue Jul 12 10:30:17 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux