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

[Tobias Nygren <tnn%NetBSD.org@localhost>]

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.