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>]

The following reply was made to PR port-evbarm/56944; it has been noted by GNATS.

From: Paul Lavoie <pjledge%me.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: port-evbarm-maintainer%netbsd.org@localhost,
 gnats-admin%netbsd.org@localhost,
 netbsd-bugs%netbsd.org@localhost
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 09:52:41 -0400

 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=E2=80=99m 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:
 >=20
 > The following reply was made to PR port-evbarm/56944; it has been =
 noted by GNATS.
 >=20
 > From: Tobias Nygren <tnn%NetBSD.org@localhost>
 > To: gnats-bugs%netbsd.org@localhost
 > Cc:=20
 > 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
 >=20
 >> 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)
 >=20
 > 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.
 >=20
 >=20
 >=20