Re: NetBSD Xen guest freezes system + vif MAC address confusion (NetBSD 9.99.97 / Xen 4.15.2)

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Fri, May 27, 2022 at 10:12:44AM +0200, Matthias Petermann wrote:
> 
> Hello all,
> 
> currently I am not able to instantiate a NetBSD Xen guest on NetBSD 9.99
> (side fact: I also have problems with a Windows guest, but it is not that
> important at the moment).
> 
> The problem occurs in the following environment:
> 
>  - Xen Kernel 4.15.2 and matching Xen Tools from pkgsrc 2022Q1 (built
> 29.04.2022)
>  - NetBSD/Xen 9.99.97 (build 25.05.2022)
> 
> The host is booted with this boot.cfg (if this matters):
> 
> ```
>     menu=Boot Xen:load /netbsd-XEN3_DOM0.gz console=pc;multiboot /xen.gz
> dom0_mem=512M vga=keep console=vga
> ```
> 
> The guest config looks like this:
> 
> ```
>     name = "net"
>     type="pv"
>     kernel = "/netbsd-INSTALL_XEN3_DOMU.gz"
>     #kernel = "/netbsd-XEN3_DOMU.gz"
>     memory = 2048
>     vcpus = 2
>     vif = [ 'mac=00:16:3E:01:00:01,bridge=bridge0' ]
>     disk = [
>        'file:/data/vhd/net.img,hda,rw',
>        'file:/data/vhd/net-export.img,hdb,rw'
>     ]
> ```
> 
> When I try to instantiate the guest, I get the following output on the
> controlling terminal:
> 
> ```
> ganymed$ doas xl create net
> Parsing config from net
> libxl: error: libxl_device.c:1109:device_backend_callback: Domain 1:unable
> to add device with path /local/domain/0/backend/vif/1/0
> libxl: error: libxl_create.c:1862:domcreate_attach_devices: Domain 1:unable
> to add vif devices
> ```

did you create the bridge0 ?

> 
> At the same time the following message appears on the system console:
> 
> ```
> [   184.680057] xbd backend: attach device vnd0d (size 1048576000) for
> domain 1
> [   184.910057] xbd backend: attach device vnd1d (size 33554432) for domain
> 1
> [   195.260077] xvif1i0: Ethernet address 00:16:3e:02:00:01
> [   195.320059] xbd backend: detach device vnd1d for domain 1
> [   195.350051] xbd backend: detach device vnd0d for domain 1
> [   195.450054] xvif1i0: disconnecting
> ```
> 
> After the messages appear on the system console, the system does not respond
> to any input either via SSH or on the local console. It seems to be frozen.
> I can still activate the kernel debugger with Control+Alt+Escape.

Can you get a stack trace, and processes list ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--