Re: port-evbarm/56944: ZFS heavy usage on NetBSD running in Mac M1 VM results in kernel thread running away and filesystem hang

[Paul Lavoie <pjledge%me.com@localhost>]

It is indeed pagedaemon.

I can reproduce this within a fifteen minute window at will, so if there is anything I can do to help gather information, I’m more than willing to gather anything.  This is just outside of my depth to know where to start...

> On Jul 27, 2022, at 9:40 AM, Tobias Nygren <tnn%NetBSD.org@localhost> wrote:
> 
> The following reply was made to PR port-evbarm/56944; it has been noted by GNATS.
> 
> From: Tobias Nygren <tnn%NetBSD.org@localhost>
> To: gnats-bugs%netbsd.org@localhost
> Cc: 
> Subject: Re: port-evbarm/56944: ZFS heavy usage on NetBSD running in Mac M1
> VM results in kernel thread running away and filesystem hang
> Date: Wed, 27 Jul 2022 15:38:50 +0200
> 
>> When trying to copy a large amount of data (300GB) to a fresh ZFS file system, the copy will hang after a few minutes. Looking at the output of top, a [system] process can be seen using a full CPU constantly, only going away on a system restart.
>> This works fine using ZFS on the amd64 platform (same NetBSD version)
> 
> If the system thread is pagedaemon (press t in top to view details)
> then I can reproduce this bug on amd64 as well. It isn't super easy to
> reproduce for me though. If you can confirm this then it is likely a
> duplicate of PR kern/56887.
> 
> 
>