[Xen-users] domU shutdown as (null)

[Valentin Vidic <Valentin.Vidic@xxxxxxxxx>]

Hi,

Is it normal for a domU with a lot of memory to appear as (null) for a minute
or so after shutdown?  It seems to be scrubbing memory and I'm unable to
create a new machine until this finishes.

# xl list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0 10240    56     r-----     276.9
test                                         2 204800    56     -b----      32.2

# xl shutdown test
# xl list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0 10240    56     r-----     276.9
(null)                                       2 204800    56     --ps--      32.8
...
(null)                                       2 186878    56     --ps--      32.8
...
(null)                                       2 164308    56     --ps--      32.8

# xl create /etc/xen/test.cfg
Parsing config from /etc/xen/test.cfg
libxl: notice: libxl_numa.c:518:libxl__get_numa_candidate: NUMA placement 
failed, performance might be affected
xc: error: panic: xc_dom_boot.c:141: xc_dom_boot_mem_init: can't allocate low 
memory for domain: Out of memory
libxl: error: libxl_dom.c:653:libxl__build_dom: xc_dom_boot_mem_init failed: 
Cannot allocate memory
libxl: error: libxl_create.c:1223:domcreate_rebuild_done: cannot (re-)build 
domain: -3
libxl: error: libxl.c:1575:libxl__destroy_domid: non-existant domain 3
libxl: error: libxl.c:1534:domain_destroy_callback: unable to destroy guest 
with domid 3
libxl: error: libxl.c:1463:domain_destroy_cb: destruction of domain 3 failed

# xl list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0 10240    56     r-----     276.9
(null)                                       2 27448    56     --ps--      32.8
...
(null)                                       2 19889    56     --ps--      32.8
...
(null)                                       2 14598    56     --ps--      32.8

The system uses Xen 4.8.1 and Linux 4.9.30-2+deb9u2. 

-- 
Valentin

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