Re: Problems starting Xen domU after latest stable update

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 1/28/21 6:52 PM, Michael D Labriola wrote:
> Hey, everyone.  I've run into problems starting up my Xen domUs as of
> the latest batch of stable updates.  Whenever I try to create one, I
> get a bunch of block device errors like this:
>
> libxl: error: libxl_device.c:1105:device_backend_callback: Domain 4:unable to 
> add device with path /local/domain/0/backend/vbd/4/51712
> libxl: error: libxl_device.c:1105:device_backend_callback: Domain 4:unable to 
> add device with path /local/domain/0/backend/vbd/4/51728
> libxl: error: libxl_device.c:1105:device_backend_callback: Domain 4:unable to 
> add device with path /local/domain/0/backend/vbd/4/51744
> libxl: error: libxl_device.c:1105:device_backend_callback: Domain 4:unable to 
> add device with path /local/domain/0/backend/vbd/4/51760
> libxl: error: libxl_device.c:1105:device_backend_callback: Domain 4:unable to 
> add device with path /local/domain/0/backend/vbd/4/51776
> libxl: error: libxl_create.c:1452:domcreate_launch_dm: Domain 4:unable to add 
> disk devices
> libxl: error: libxl_device.c:1105:device_backend_callback: Domain 4:unable to 
> remove device with path /local/domain/0/backend/vbd/4/51712
> libxl: error: libxl_device.c:1105:device_backend_callback: Domain 4:unable to 
> remove device with path /local/domain/0/backend/vbd/4/51728
> libxl: error: libxl_device.c:1105:device_backend_callback: Domain 4:unable to 
> remove device with path /local/domain/0/backend/vbd/4/51744
> libxl: error: libxl_device.c:1105:device_backend_callback: Domain 4:unable to 
> remove device with path /local/domain/0/backend/vbd/4/51760
> libxl: error: libxl_device.c:1105:device_backend_callback: Domain 4:unable to 
> remove device with path /local/domain/0/backend/vbd/4/51776
> libxl: error: libxl_domain.c:1290:devices_destroy_cb: Domain 
> 4:libxl__devices_destroy failed
> libxl: error: libxl_domain.c:1177:libxl__destroy_domid: Domain 4:Non-existant 
> domain
> libxl: error: libxl_domain.c:1131:domain_destroy_callback: Domain 4:Unable to 
> destroy guest
> libxl: error: libxl_domain.c:1058:domain_destroy_cb: Domain 4:Destruction of 
> domain failed
>
> I'm using Xen 4.13.1 on the box I've been testing with.
>
> I bisected down to this commit, and reverting it does indeed fix my
> problem.  Well, this commit upstream and it's cherry-picked variants
> on linux-5.4.y and linux-5.10.y.


You most likely need 5f46400f7a6a4fad635d5a79e2aa5a04a30ffea1. It hit Linus 
tree a few hours ago.


-boris