[Xen-devel] domain reboot problem

[Jody Belka <lists-xen@xxxxxxxx>]

During a domain reboot, something in xen/xend appears to be holding on to the
old domains memory allocation still when the new domain is created. As a result,
if you don't have enough unallocated memory available for the second instance
(eg, you're using the auto dom0-balloon functionality) then the creation fails.

I had a quick look at the code last night, but couldn't spot the problem. But
then, it /was/ 2.30am in the morning *g*

relevant portion of a xend.log when this happens attached.


J
-- 
Jody Belka
knew (at) pimb (dot) org

[2005-11-16 13:04:20 xend.XendDomainInfo] INFO (XendDomainInfo:709) Domain has 
shutdown: name=inara id=17 reason=reboot.
[2005-11-16 13:04:20 xend.XendDomainInfo] DEBUG (XendDomainInfo:1135) 
XendDomainInfo.destroyDomain(17)
[2005-11-16 13:04:21 xend.XendDomainInfo] DEBUG (XendDomainInfo:151) 
XendDomainInfo.create(['domain', ['domid', 17], ['name', 'inara'], ['uuid', 
'4ac65e03-3900-168f-63bb-63b3fffe8e2d'], ['ssidref', 0], ['vcpus', 1], 
['vcpu_avail', 1], ['cpu_weight', 1.0], ['memory', 64], ['maxmem', 64], 
['on_poweroff', 'destroy'], ['on_reboot', 'restart'], ['on_crash', 'restart'], 
['image', ['linux', ['kernel', '/boot/vmlinuz-2.6.12-xen.unpriv-evms'], 
['root', '/dev/hda1 ro'], ['vcpus', '1'], ['vcpus', '1'], ['boot', 'c']]], 
['device', ['vif', ['backend', 0], ['script', 'vif-bridge'], ['mac', 
'00:16:3e:3f:ec:1a']]], ['device', ['vbd', ['backend', 0], ['dev', 'hda1'], 
['uname', 'phy:/dev/evms/domU/inara/root'], ['mode', 'w']]], ['device', ['vbd', 
['backend', 0], ['dev', 'hda2'], ['uname', 'phy:/dev/evms/domU/inara/swap0'], 
['mode', 'w']]], ['state', '---s--'], ['shutdown_reason', 'reboot'], 
['cpu_time', 7.1583156829999997], ['vcpus', 1], ['online_vcpus', 1]])
[2005-11-16 13:04:21 xend.XendDomainInfo] DEBUG (XendDomainInfo:254) 
parseConfig: config is ['domain', ['domid', 17], ['name', 'inara'], ['uuid', 
'4ac65e03-3900-168f-63bb-63b3fffe8e2d'], ['ssidref', 0], ['vcpus', 1], 
['vcpu_avail', 1], ['cpu_weight', 1.0], ['memory', 64], ['maxmem', 64], 
['on_poweroff', 'destroy'], ['on_reboot', 'restart'], ['on_crash', 'restart'], 
['image', ['linux', ['kernel', '/boot/vmlinuz-2.6.12-xen.unpriv-evms'], 
['root', '/dev/hda1 ro'], ['vcpus', '1'], ['vcpus', '1'], ['boot', 'c']]], 
['device', ['vif', ['backend', 0], ['script', 'vif-bridge'], ['mac', 
'00:16:3e:3f:ec:1a']]], ['device', ['vbd', ['backend', 0], ['dev', 'hda1'], 
['uname', 'phy:/dev/evms/domU/inara/root'], ['mode', 'w']]], ['device', ['vbd', 
['backend', 0], ['dev', 'hda2'], ['uname', 'phy:/dev/evms/domU/inara/swap0'], 
['mode', 'w']]], ['state', '---s--'], ['shutdown_reason', 'reboot'], 
['cpu_time', 7.1583156829999997], ['vcpus', 1], ['online_vcpus', 1]]
[2005-11-16 13:04:21 xend.XendDomainInfo] DEBUG (XendDomainInfo:308) 
parseConfig: result is {'ssidref': 0, 'name': 'inara', 'bootloader': None, 
'on_reboot': 'restart', 'image': ['linux', ['kernel', 
'/boot/vmlinuz-2.6.12-xen.unpriv-evms'], ['root', '/dev/hda1 ro'], ['vcpus', 
'1'], ['vcpus', '1'], ['boot', 'c']], 'on_poweroff': 'destroy', 'on_crash': 
'restart', 'backend': [], 'vcpus': 1, 'cpu_weight': 1.0, 'vcpu_avail': 1, 
'memory': 64, 'device': [('vif', ['vif', ['backend', 0], ['script', 
'vif-bridge'], ['mac', '00:16:3e:3f:ec:1a']]), ('vbd', ['vbd', ['backend', 0], 
['dev', 'hda1'], ['uname', 'phy:/dev/evms/domU/inara/root'], ['mode', 'w']]), 
('vbd', ['vbd', ['backend', 0], ['dev', 'hda2'], ['uname', 
'phy:/dev/evms/domU/inara/swap0'], ['mode', 'w']])], 'maxmem': 64, 'cpu': None, 
'uuid': '4ac65e03-3900-168f-63bb-63b3fffe8e2d'}
[2005-11-16 13:04:21 xend.XendDomainInfo] DEBUG (XendDomainInfo:1016) 
XendDomainInfo.construct: None 0
[2005-11-16 13:04:21 xend.XendDomainInfo] DEBUG (XendDomainInfo:1048) 
XendDomainInfo.initDomain: 18 1.0
[2005-11-16 13:04:21 xend.XendDomainInfo] ERROR (XendDomainInfo:162) Domain 
construction failed
Traceback (most recent call last):
  File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 156, in create
    vm.initDomain()
  File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 1061, in initDomain
    xc.domain_memory_increase_reservation(self.domid, m, 0, 0)
error: (12, 'Cannot allocate memory')
[2005-11-16 13:04:21 xend.XendDomainInfo] DEBUG (XendDomainInfo:1127) 
XendDomainInfo.destroy: domid=18
[2005-11-16 13:04:21 xend.XendDomainInfo] DEBUG (XendDomainInfo:1135) 
XendDomainInfo.destroyDomain(18)
[2005-11-16 13:04:21 xend.XendDomainInfo] ERROR (XendDomainInfo:1299) Failed to 
restart domain 17.
Traceback (most recent call last):
  File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 1288, in restart
    new_dom = xd.domain_create(config)
  File 
"/home/jmb/src/xen/xen3/dist/install/usr/lib/python/xen/xend/XendDomain.py", 
line 214, in domain_create
  File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 156, in create
    vm.initDomain()
  File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 1061, in initDomain
    xc.domain_memory_increase_reservation(self.domid, m, 0, 0)
error: (12, 'Cannot allocate memory')

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