Re: zfskern{txg_thread_enter} thread using 100% or more CPU

From: Steve Wills <>
Date: Thu, 3 May 2018 16:27:04 -0400
I finally caught this happening while I had "lockstat sleep 1" running 
in a loop, the output looks like:

And top looks like this:

Also noticed that there are actually 2 threads of pid 17 
[zfskern{txg_thread_enter}] which are reporting 57% and 42% of disk IO, 
everything else is idle as far as IO. The system is not totally 
unresponsive, processes that don't need IO are working, but anything 
that needs IO hangs. Perhaps it's a hardware issue, but I can't find any 
other evidence of it. Any ideas?


On 04/24/2018 19:30, Steve Wills wrote:
> Hi,
> Recently on multiple systems running CURRENT, I've been seeing the 
> system become unresponsive. Leaving top(1) running has lead me to notice 
> that when this happens, the system is still responding to ping and top 
> over ssh is still working, but no new processes can start and switching 
> to other tasks doesn't work. In top, I do see pid 17, 
> [zfskern{txg_thread_enter}] monopolizing both CPU usage and disk IO. Any 
> ideas how to troubleshoot this? It doesn't appear to be a hardware issue.
> Steve
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Received on Thu May 03 2018 - 18:27:20 UTC

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