[Xen-devel] unable to start VM after xen upgrade to 4.8.2

["Alex Braunegg" <alex.braunegg@xxxxxxxxx>]

Hi all,

I recently updated from xen-4.6.6 to xen-4.8.2 and I am unable to start any
guest that previously worked without issue under 4.6.6. The create process
fails with the following:

        libxl: debug: libxl_event.c:636:libxl__ev_xswatch_register: watch
w=0x9cea28 wpath=/local/domain/0/device-model/1/state token=3/1: register
slotnum=3
        libxl: debug: libxl_event.c:573:watchfd_callback: watch w=0x9cea28
wpath=/local/domain/0/device-model/1/state token=3/1: event
epath=/local/domain/0/device-model/1/state
        libxl: debug: libxl_exec.c:398:spawn_watch_event: domain 1 device
model: spawn watch p=(null)
        libxl: debug: libxl_event.c:673:libxl__ev_xswatch_deregister: watch
w=0x9cea28 wpath=/local/domain/0/device-model/1/state token=3/1: deregister
slotnum=3
        libxl: error: libxl_dm.c:2189:device_model_spawn_outcome: domain 1
device model: spawn failed (rc=-3)
        libxl: error: libxl_create.c:1504:domcreate_devmodel_started: device
model did not start: -3

Reading on similar issues in the past, I have validated that the versions of
xen libraries are all 4.8.2:

xen-runtime-4.8.2-3.el6.x86_64
xen-ocaml-4.8.2-3.el6.x86_64
xen-libs-4.8.2-3.el6.x86_64
xen-doc-4.8.2-3.el6.x86_64
xen-4.8.2-3.el6.x86_64
xen-licenses-4.8.2-3.el6.x86_64
xen-hypervisor-4.8.2-3.el6.x86_64

xl info:

host                   : intel-s5000xvn.<redacted>
release                : 4.4.102-1.el6.x86_64
version                : #1 SMP Fri Dec 1 08:17:06 EST 2017
machine                : x86_64
nr_cpus                : 8
max_cpu_id             : 7
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 1861
hw_caps                :
b7ebfbff:0004e3bd:20100800:00000001:00000000:00000000:00000000:00000000
virt_caps              : hvm
total_memory           : 8165
free_memory            : 6022
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 8
xen_extra              : .2
xen_version            : 4.8.2
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64 
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : 
xen_commandline        : dom0_mem=2048M,max:2048M cpufreq=xen
dom0_max_vcpus=1 dom0_vcpus_pin
cc_compiler            : gcc (GCC) 4.6.2 20111027 (Red Hat 4.6.2-1)
cc_compile_by          : mockbuild
cc_compile_domain      : <redacted>
cc_compile_date        : Fri Dec  1 12:00:55 EST 2017
build_id               : 419c922ca399ca987e0d19bef7e8823f5711ee54
xend_config_format     : 4

If I roll back to my 4.6.6 version of xen using the same kernel (4.4.102),
the guest starts without issue.

Attached is the full output from "xl -vvvv create" when using xen 4.8.2. Any
suggestions is greatly appreciated.

Best regards,

Alex

Attachment: xl_create_error_output.txt
Description: Text document

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