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