Package: xen-utils-4.1 Version: 4.1.4-3+deb7u1 Severity: important When starting (or migrating in) a domain, sometimes I get the following exception: [2014-04-01 10:58:08 4821] ERROR (XendDomainInfo:2927) XendDomainInfo.initDomain: exception occurred Traceback (most recent call last): File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 2914, in _initDomain self._createDevices() File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 2364, in _createDevices devid = self._createDevice(devclass, config) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 2326, in _createDevice return self.getDeviceController(deviceClass).createDevice(devConfig) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/DevController.py", line 63, in createDevice (devid, back, front) = self.getDeviceDetails(config) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/netif.py", line 122, in getDeviceDetails devid = self.allocateDeviceID() File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/DevController.py", line 406, in allocateDeviceID return complete(path, self._allocateDeviceID) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/xenstore/xstransact.py", line 361, in complete t = xstransact(path) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/xenstore/xstransact.py", line 29, in __init__ self.transaction = xshandle().transaction_start() Error: (2, 'No such file or directory') [2014-04-01 10:58:08 4821] ERROR (XendDomainInfo:488) VM start failed After this, the system is left in an inconsistent state: # xm list|grep x x 69 1024 1 --ps-- 0.0 # xm destroy x Error: (2, 'No such file or directory') Usage: xm destroy <Domain> Terminate a domain immediately. Now if I try to 'xm create' a new domain, I get the following: [2014-04-02 18:14:20 4821] ERROR (xmlrpclib2:181) Internal error handling xend.domain.create Traceback (most recent call last): File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/xmlrpclib2.py", line 134, in _marshaled_dispatch response = self._dispatch(method, params) File "/usr/lib/python2.7/SimpleXMLRPCServer.py", line 420, in _dispatch return func(*params) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/XMLRPCServer.py", line 80, in domain_create info = XendDomain.instance().domain_create(config) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomain.py", line 999, in domain_create self._refresh() File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomain.py", line 429, in _refresh self._refreshTxn(txn, refresh_shutdown) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomain.py", line 442, in _refreshTxn self.domains[domid].update(dom, refresh_shutdown, transaction) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 3543, in update self.refreshShutdown(info) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 2069, in refreshShutdown if self.readDom('xend/shutdown_completed'): File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 1693, in readDom return xstransact.Read(self.dompath, *args) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/xenstore/xstransact.py", line 307, in Read return complete(path, lambda t: t.read(*args)) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/xenstore/xstransact.py", line 361, in complete t = xstransact(path) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/xenstore/xstransact.py", line 29, in __init__ self.transaction = xshandle().transaction_start() Error: (2, 'No such file or directory') After restaring xend even a simple 'xm list' operation results in Error: (2, 'No such file or directory'): [2014-04-02 18:17:01 28301] ERROR (xmlrpclib2:181) Internal error handling xend.domains_with_state Traceback (most recent call last): File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/xmlrpclib2.py", line 134, in _marshaled_dispatch response = self._dispatch(method, params) File "/usr/lib/python2.7/SimpleXMLRPCServer.py", line 420, in _dispatch return func(*params) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/XMLRPCServer.py", line 67, in domains_with_state domains = XendDomain.instance().list_sorted(state) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomain.py", line 879, in list_sorted doms = self.list(state) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomain.py", line 848, in list self._refresh(refresh_shutdown = False) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomain.py", line 429, in _refresh self._refreshTxn(txn, refresh_shutdown) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomain.py", line 445, in _refreshTxn new_dom = XendDomainInfo.recreate(dom, False) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 180, in recreate vmpath = xstransact.Read(dompath, "vm") File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/xenstore/xstransact.py", line 307, in Read return complete(path, lambda t: t.read(*args)) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/xenstore/xstransact.py", line 361, in complete t = xstransact(path) File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/xenstore/xstransact.py", line 29, in __init__ self.transaction = xshandle().transaction_start() Error: (2, 'No such file or directory') Changing the toolstack to xl gave some basic functionality back (I can at least list VMs now, starting is not possible and other operations have not been tried yet). The configuration of the VM that triggered this issue is the following: kernel = '/usr/lib/xen/boot/hvmloader' builder='hvm' device_model = '/usr/lib/xen/bin/qemu-dm' vfb = ['type=vnc,vnclisten=0.0.0.0:6122,vncdisplay=6122,vncpasswd=x'] memory = 1024 name = "x" vcpus = 1 vif = [ 'vifname=x,mac=00:16:3e:00:00:22,ip=x' ] disk = [ 'phy:x,hda,w', ]