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Date: Thu, 26 May 2016 17:10:25 +0200
From: Roger Pau =?iso-8859-1?Q?Monn=E9?= <roger.pau@citrix.com>
To: Marcin Cieslak <saper@saper.info>
CC: <freebsd-xen@freebsd.org>
Subject: Re: Leftover (null) domUs
Message-ID: <20160526151025.we5erunbf5dsmejh@mac>
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On Mon, May 23, 2016 at 07:38:42PM +0000, Marcin Cieslak wrote:
> Hello,
> 
> sometimes (rarely) zombie domains are left over after "xl destroy":
> 
> # xl list
> Name                                        ID   Mem VCPUs  State   Time(s)
> Domain-0                                     0  3270     1     r-----   28887.1
> (null)                                       7     0     1     --ps-d     769.7
> (null)                                      34     0     2     --p--d       5.3
> 
> both are HVMs runing on r299012, (#7 was HVM FreeBSD guest, #34 Windows 2016 Server).
> 
> Recent "xl dmesg entries":
> 
> (XEN) mm.c:2010:d0v0 Error pfn 12b0a5: rd=ffff8304122e4000, od=0000000000000000, caf=180000000000000, taf=0000000000000001
> (XEN) mm.c:2010:d0v0 Error pfn 12b0a4: rd=ffff8304122e4000, od=0000000000000000, caf=180000000000000, taf=0000000000000001
> (XEN) mm.c:2010:d0v0 Error pfn 12b0a3: rd=ffff8304122e4000, od=0000000000000000, caf=180000000000000, taf=0000000000000001
> (XEN) mm.c:2010:d0v0 Error pfn 12b0a2: rd=ffff8304122e4000, od=0000000000000000, caf=180000000000000, taf=0000000000000001

Right, can you paste the output of the 'g' debug key when you have only 
domains in such state?

You can easily do it from xl, using the following rune:

# xl debug-keys g

Then if you have the serial console setup you will see some output on it, if 
not you can fetch the output using `xl dmesg`.

Thanks, Roger.