Leftover (null) domUs

[Marcin Cieslak]

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

Trying to kill them again with xl destroy causes:

# xl destroy 7
libxl: error: libxl_dm.c:1602:kill_device_model: unable to find device model pid in /local/domain/7/image/device-model-pid
libxl: error: libxl.c:1615:libxl__destroy_domid: libxl__destroy_device_model failed for 7
libxl: info: libxl.c:1698:devices_destroy_cb: forked pid 18500 for destroy of domain 7

Marcin