Hi there,
I have a Debian Lenny Xen server with a few VMs all running Debian Lenny.
One of these occasionally dies with no apparent reason. Theres nothing in
its own logs that give any indication of what went wrong. I see nothing in
the Xen logs that helps me directly.
I see entries like the one at the end of this mail (I'm going to put the
log data at the end because it is a gigantic wall of text).
The config file for this domU contains:
<config>
on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'
</config>
so I was expecting it would restart... however looking at the Xen logs it
appears that when Xen tries to restart the crashed domU it comes to believe
that its already running...
I'm wondering where I should start debugging this problem. It happens very
intermittently.
<logentries>
[2009-10-05 20:34:54 3606] WARNING (XendDomainInfo:1258) Domain has
crashed: name=monitoring-lenny id=36.
[2009-10-05 20:34:54 3606] DEBUG (XendDomainInfo:1914)
XendDomainInfo.destroyDomain(36)
[2009-10-05 20:34:54 3606] DEBUG (XendDomainInfo:1529) Destroying device model
[2009-10-05 20:34:54 3606] DEBUG (XendDomainInfo:1536) Releasing devices
[2009-10-05 20:34:54 3606] DEBUG (XendDomainInfo:1542) Removing vif/0
...
more 'destroyDevice' entries
...
[2009-10-05 20:34:54 3606] DEBUG (XendDomainInfo:1534) No device model
[2009-10-05 20:34:54 3606] DEBUG (XendDomainInfo:1536) Releasing devices
[2009-10-05 20:34:54 3606] DEBUG (XendDomainInfo:106)
XendDomainInfo.create_from_dict({'vcpus_params': {'cap': 0, 'weight': 256},
'PV_args': 'root=/dev/sda2 ro clocksource=jiffies', 'features': '', 'cpus':
[], 'paused': 0, 'domid': 36, 'shutdown': 0, 'VCPUs_live': 1,
'PV_bootloader': '', 'actions_after_crash': 'restart', 'vbd_refs':
['8baad5aa-45c9-97f1-1a19-96615ef72229',
'38a9f2bc-c8ee-8cfc-dac8-11c73eb130e4'], 'PV_ramdisk':
'/boot/initrd.img-2.6.26-1-xen-686', 'is_control_domain': False,
'name_label': 'monitoring-lenny', 'VCPUs_at_startup': 1, 'HVM_boot_params':
{}, 'platform': {}, 'PV_kernel': '/boot/vmlinuz-2.6.26-1-xen-686',
'console_refs': ['420f5516-d7bd-9d03-b840-d7c0d23e9963'], 'online_vcpus':
1, 'blocked': 0, 'on_xend_stop': 'ignore', 'memory_static_min': 0,
'HVM_boot_policy': '', 'shutdown_reason': 3, 'VCPUs_max': 3, 'start_time':
1249957930.470108, 'memory_static_max': 1073741824,
'actions_after_shutdown': 'destroy', 'on_xend_start': 'ignore', 'crashed':
0, 'memory_dynamic_max': 1073741824, 'actions_after_suspend': '',
'is_a_template': False, 'PV_bootloader_args': '', 'memory_dynamic_min':
1073741824, 'uuid': 'ac86ee9d-45b8-7359-b736-bdc74506068c', 'cpu_time':
482327.477346609, 'shadow_memory': 0, 'dying': 0, 'vcpu_avail': 7, 'notes':
{'HV_START_LOW': 4118806528L, 'FEATURES':
'writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel',
'VIRT_BASE': 3221225472L, 'GUEST_VERSION': '2.6', 'PADDR_OFFSET': 0,
'GUEST_OS': 'linux', 'HYPERCALL_PAGE': 3222278144L, 'LOADER': 'generic',
'SUSPEND_CANCEL': 1, 'PAE_MODE': 'yes', 'ENTRY': 3222274048L,
'XEN_VERSION': 'xen-3.0'}, 'other_config': {}, 'running': 0,
'actions_after_reboot': 'restart', 'vif_refs':
['ef714b6e-164c-5d7f-2708-bdc6a251221f',
'0238b375-fb4d-7990-9644-5f2ec53c83ca'], 'vtpm_refs': [], 'devices':
{'38a9f2bc-c8ee-8cfc-dac8-11c73eb130e4': ('vbd', {'uuid':
'38a9f2bc-c8ee-8cfc-dac8-11c73eb130e4', 'bootable': 0, 'devid': 2049,
'driver': 'paravirtualised', 'dev': 'sda1', 'uname':
'phy:volumes/monitoring-lenny-swap', 'mode': 'w'}),
'0238b375-fb4d-7990-9644-5f2ec53c83ca': ('vif', {'bridge': 'xenbr1',
'rate': '10MB/s', 'devid': 1, 'mac': '00:16:3E:12:69:5E', 'uuid':
'0238b375-fb4d-7990-9644-5f2ec53c83ca'}),
'ef714b6e-164c-5d7f-2708-bdc6a251221f': ('vif', {'bridge': 'eth0', 'rate':
'10MB/s', 'devid': 0, 'mac': '00:16:3E:C7:8A:C8', 'uuid':
'ef714b6e-164c-5d7f-2708-bdc6a251221f'}),
'8baad5aa-45c9-97f1-1a19-96615ef72229': ('vbd', {'uuid':
'8baad5aa-45c9-97f1-1a19-96615ef72229', 'bootable': 1, 'devid': 2050,
'driver': 'paravirtualised', 'dev': 'sda2', 'uname':
'phy:volumes/monitoring-lenny', 'mode': 'w'}),
'420f5516-d7bd-9d03-b840-d7c0d23e9963': ('console', {'location': '2',
'devid': 0, 'protocol': 'vt100', 'uuid':
'420f5516-d7bd-9d03-b840-d7c0d23e9963', 'other_config': {}})}})
[2009-10-05 20:34:54 3606] ERROR (XendDomainInfo:111) Domain construction
failed
Traceback (most recent call last):
File "/usr/lib/xen-3.2-1/lib/python/xen/xend/XendDomainInfo.py", line
109, in create_from_dict
vm.start()
File "/usr/lib/xen-3.2-1/lib/python/xen/xend/XendDomainInfo.py", line
444, in start
raise XendError('VM already running')
XendError: VM already running
[2009-10-05 20:34:54 3606] DEBUG (XendDomainInfo:1897)
XendDomainInfo.destroy: domid=36
[2009-10-05 20:34:54 3606] ERROR (XendDomainInfo:1425) Failed to restart
domain 36.
</logentries>
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