Re: NetBSD DomU (PV) hangs on Xen 4.13.1 / NetBSD 9.1

[Jaromír Doleček <jaromir.dolecek%gmail.com@localhost>]

TL;DR ZFS + Xen doesn't work together under NetBSD 9.1. You need to
either use NetBSD-current, or use something other than ZFS.

Longer version: Xen under NetBSD up to 9.x had a limitation of 32KB
MAXBSIZE related to xbd(4), the Xen kernels had an option override to
force the lower limit. This limitation was removed in NetBSD-current.
ZFS is loaded as a module, and is compiled with default MAXBSIZE of
64kb, which doesn't work with the Xen kernel's 32KB.

Jaromir

Le mer. 23 déc. 2020 à 11:04, Matthias Petermann <mp%petermann-it.de@localhost> a écrit :
>
> Hello Brian,
>
> Am 22.12.2020 um 18:51 schrieb Brian Buhrow:
> >       hello.  Just for giggles, what if you reduce the vcpu count to 1 to make sure you're not running into some sort of crazy race condition with the domu
> > or a constraint in the dom0?  If it works, then you can explore why a count of 8 doesn't.
>
> I did that - but same effect here.
>
> Anyway, during my tests I observed that one attempt with the ZVOL
> renders the system in state in which even the file backed volume will
> panic. After this, restarting xencommons doesn't help but a complete
> system reboot will do.
>
> Kind regards
> Matthias