Hi Neil and all,

thank you very much for looking into this:

So I don't know what's going on. What is the typical call stack for those
zil_clean() threads?

I'd say they are all blocking on their respective CVs:

ffffff0009066c60 fffffffffbc2c030                0   0  60 ffffff01d25e1180
  PC: _resume_from_idle+0xf1    TASKQ: zil_clean
  stack pointer for thread ffffff0009066c60: ffffff0009066b60
  [ ffffff0009066b60 _resume_from_idle+0xf1() ]
    swtch+0x147()
    cv_wait+0x61()
    taskq_thread+0x10b()
    thread_start+8()

I should add that I have quite a lot of datasets:

r...@haggis:~# zfs list -r -t filesystem | wc -l
      49
r...@haggis:~# zfs list -r -t volume | wc -l
      14
r...@haggis:~# zfs list -r -t snapshot | wc -l
    6018

Nils
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