[CentOS-virt] Cannot allocate Memory

Wed Jun 22 17:45:05 UTC 2016
Shaun Reitan <shaun.reitan at ndchost.com>

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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