http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=226
Summary: Misleading error message
Product: Xen
Version: unstable
Platform: All
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Tools
AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
ReportedBy: treed-bugzilla@xxxxxxxxxxxxxxx
While configuring xen-unstable (source distro downloaded and compiled on Sep 13)
on my P4 with 512M of RAM running CentOS 4.1 as both host and guest OS's I ran
into an interesting problem which I consider a bug. My machine has 512M of RAM
and I had dom0 configured to use 256 so I thought it would be ok to configure a
domU to use 256 also, not taking into account overhead. It too me longer to
figure out this problem than it should have because the error message upon
trying to start the domain was very misleading:
[root@localhost xen]# xm create /etc/xen/mail.conf
Using config file "/etc/xen/mail.conf".
Error: Error creating domain: (2, 'No such file or directory')
Being new to xen I was not aware of the logfiles in /var/log but once someone on
IRC turned me onto them I found the following:
[root@localhost xen]# cat /var/log/xend-debug.log
Failed alocation for dom 28 : 65536 pages order 0 addr_bits 0
Traceback (most recent call last):
File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 636, in construct
self.init_domain()
File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 818, in init_domain
id = self.image.initDomain(self.id, self.memory, self.ssidref, cpu,
self.cpu_weight)
File "/usr/lib/python/xen/xend/image.py", line 167, in initDomain
xc.domain_memory_increase_reservation(dom, mem_kb-lmem_kb, 0, 0)
error: (12, 'Cannot allocate memory')
Traceback (most recent call last):
File "/usr/lib/python/xen/xend/server/SrvDomainDir.py", line 78, in op_create
dominfo = self.xd.domain_create(config)
File "/usr/lib/python/xen/xend/XendDomain.py", line 293, in domain_create
dominfo = XendDomainInfo.create(self.dbmap, config)
File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 162, in create
vm.construct(config)
File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 651, in construct
self.destroy()
File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 774, in destroy
self.cleanup()
File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 743, in cleanup
self.release_devices()
File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 791, in
release_devices
for d in t.list("vbd"):
File "/usr/lib/python/xen/xend/xenstore/xstransact.py", line 110, in list
ret.extend(self._list(key))
File "/usr/lib/python/xen/xend/xenstore/xstransact.py", line 103, in _list
return map(lambda x: key + "/" + x, xshandle().ls(path))
RuntimeError: (2, 'No such file or directory')
[root@localhost xen]#
Towards the top of the traceback is the memory allocation error followed by a
"No such file or directory" error. I think xen should give a more reasonable
error message which describes the real problem.
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