[CentOS-virt] Cannot allocate Memory

Shaun Reitan
Wed, 22 Jun 2016 17:45:05 -0000

Any of you guys ever seen an issue with Xen 4.4 were xm cannot create a
guest because of what looks like an issue allocating memory even though
xm info shows like 5x the amount of free memory needed? We are still
unfortunately still using xm... it's on my list, i know..

We've had this happen on a couple hosts now.  Only way to resolve seams
to be rebooting the host.  I'm going to update the host to latest Xen
4.4 now hoping this is a old bug.


Here's from xen logs

[2016-06-22 09:13:50 1958] DEBUG (XendDomainInfo:105)
XendDomainInfo.create(['vm', ['name', 'xxx'],
['memory', 2048],
['on_xend_start', 'ignore'], ['on_xend_stop',
'ignore'], ['vcpus', 2],
['oos', 1], ['image', ['linux', ['kernel',
'/kernels/vmlinux-2.6.18.8-4'], ['videoram', 4],
['args',
'root=/dev/xvda ro xencons=tty console=tty1 '], ['tsc_mode', 0],
['nomigrate', 0]]], ['s3_integrity', 1], ['device',
['vbd', ['uname',
'phy:vg/fs_6818'], ['dev', 'xvda'], ['mode',
'w']]], ['device', ['vbd',
['uname', 'phy:vg/fs_6819'], ['dev', 'xvdb'],
['mode', 'w']]],
['device', ['vif', ['rate', '40mb/s'],
['mac', 'FE:FD:48:01:F1:E7']]]])
[2016-06-22 09:13:50 1958] DEBUG (XendDomainInfo:2504)
XendDomainInfo.constructDomain
[2016-06-22 09:13:50 1958] DEBUG (balloon:187) Balloon: 7602632 KiB
free; need 16384; done.
[2016-06-22 09:13:50 1958] ERROR (XendDomainInfo:2566) (12, 'Cannot
allocate memory')
Traceback (most recent call last):
   File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
line 2561, in _constructDomain
     target = self.info.target())
Error: (12, 'Cannot allocate memory')
[2016-06-22 09:13:50 1958] ERROR (XendDomainInfo:490) VM start failed
Traceback (most recent call last):
   File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
line 475, in start
     XendTask.log_progress(0, 30, self._constructDomain)
   File "/usr/lib64/python2.6/site-packages/xen/xend/XendTask.py",
line
209, in log_progress
     retval = func(*args, **kwds)
   File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
line 2572, in _constructDomain
     raise VmError(failmsg)
VmError: Creating domain failed: name=xxx
[2016-06-22 09:13:50 1958] ERROR (XendDomainInfo:110) Domain
construction failed
Traceback (most recent call last):
   File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
line 108, in create
     vm.start()
   File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
line 475, in start
     XendTask.log_progress(0, 30, self._constructDomain)
   File "/usr/lib64/python2.6/site-packages/xen/xend/XendTask.py",
line
209, in log_progress
     retval = func(*args, **kwds)
   File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
line 2572, in _constructDomain
     raise VmError(failmsg)
VmError: Creating domain failed: name=xxx

--
Shaun
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