Public bug reported:

Up to 5.15.0-117-generic (package 5.15.0-117.127), I could reliably
suspend and restart my computer.  Now with package 5.15.0-119.129, I
cannot suspend.

I get this error:

Sep  8 21:26:35 trotzdem kernel: [ 2365.487773] Freezing user space processes 
... (elapsed 0.003 seconds) done.
Sep  8 21:26:35 trotzdem kernel: [ 2365.491406] OOM killer disabled.
Sep  8 21:26:35 trotzdem kernel: [ 2365.491408] Freezing remaining freezable 
tasks ... 
Sep  8 21:26:35 trotzdem kernel: [ 2385.497718] Freezing of tasks failed after 
20.005 seconds (1 tasks refusing to freeze, wq_busy=0):
Sep  8 21:26:35 trotzdem kernel: [ 2385.497884] task:lockd           state:I 
stack:    0 pid: 1677 ppid:     2 flags:0x00004000
Sep  8 21:26:35 trotzdem kernel: [ 2385.497893] Call Trace:
Sep  8 21:26:35 trotzdem kernel: [ 2385.497898]  <TASK>
Sep  8 21:26:35 trotzdem kernel: [ 2385.497904]  __schedule+0x24e/0x590
Sep  8 21:26:35 trotzdem kernel: [ 2385.497916]  schedule+0x69/0x110
Sep  8 21:26:35 trotzdem kernel: [ 2385.497922]  schedule_timeout+0x105/0x140
Sep  8 21:26:35 trotzdem kernel: [ 2385.497931]  svc_get_next_xprt+0xf1/0x190 
[sunrpc]
Sep  8 21:26:35 trotzdem kernel: [ 2385.498041]  svc_recv+0x1a9/0x330 [sunrpc]
Sep  8 21:26:35 trotzdem kernel: [ 2385.498142]  lockd+0xa9/0x1c0 [lockd]
Sep  8 21:26:35 trotzdem kernel: [ 2385.498162]  ? set_grace_period+0xa0/0xa0 
[lockd]
Sep  8 21:26:35 trotzdem kernel: [ 2385.498179]  kthread+0x12a/0x150
Sep  8 21:26:35 trotzdem kernel: [ 2385.498188]  ? set_kthread_struct+0x50/0x50
Sep  8 21:26:35 trotzdem kernel: [ 2385.498196]  ret_from_fork+0x22/0x30
Sep  8 21:26:35 trotzdem kernel: [ 2385.498206]  </TASK>
Sep  8 21:26:35 trotzdem kernel: [ 2385.498450] 
Sep  8 21:26:35 trotzdem kernel: [ 2385.498452] Restarting kernel threads ... 
Sep  8 21:26:35 trotzdem kernel: [ 2385.498661] usb 2-1: USB disconnect, device 
number 5
Sep  8 21:26:35 trotzdem kernel: [ 2385.498756] done.
Sep  8 21:26:35 trotzdem kernel: [ 2385.498761] OOM killer enabled.

It is consistently lockd which produces this error.  As far as I know,
lockd is related to NFS.  This computer is an NFS client.

I believe the issue started in version 5.15.0-118.128.  I will re-test
to confirm, then update this report.

** Affects: linux-signed-hwe-5.15 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2080181

Title:
  suspend fails because lockd refuses to freeze

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