cannot kill (null) domains

[Petr Topiarz <topiarz%post.cz@localhost>]

Hello folks,

I run NetBSD 8_stable amd64 and upgraded xen from the old 4.1 to 4.8 and 
face this issue. I do not know  when it happened but there seem to be 
two (null) paused and dying domains which consume memory and I cannot 
kill them. These two domains cannot be unpaused or destroyed, they 
ignore all commands. Any way to get rid of them?

Thank you, Petr

Here is the xen version:

# pkg_info |grep xen
xenkernel48-4.8.3   Xen 4.8.x Kernel
xentools48-4.8.3nb5 Userland Tools for Xen 4.8.x

Here you can see the list command:

# xl list
Name                                        ID   Mem VCPUs State   Time(s)
Domain-0                                     0  4096     1 r-----   75701.8
lin-orange                                   1  5000     1 -b----   46265.8
(null)                                       2  2641     1 --ps-d   10254.3
(null)                                       3  2248     1 --ps-d   12449.9
net-web                                      4  2000     1 -b----    9425.8
lin-tritius                                  5 10000     2 -b----   86002.0
net8-proxy                                   8  2000     1 -b----    3115.6
net8-compiler                                9  4000     2 -b----    7516.3
net8-web                                    10  4000     2 -b----    7672.0
win-red                                     12  4999     1 -b----    5550.6
win-aegidius                                13  3999     1 -b----      32.7
win-les                                     14  3999     1 -b----      18.6