Cause of ppc64le imagebuild failure is 2019-02-13T07:34:50.264169Z qemu-system-ppc64: cannot set up guest memory 'ppc_spapr.ram': Cannot allocate memory"

It appears that memory was not sufficient on the ppc64le builder buildvm-ppc64le-01.ppc.fedoraproject.org at the time of this build . Respective koji build https://koji.fedoraproject.org/koji/taskinfo?taskID=32772956 .
@kevin how is the current memory usage look like on builder buildvm-ppc64le-01.ppc.fedoraproject.org ? Do we need to free up some memory or next imagebuild should go fine?

[root@buildvm-ppc64le-01 ~][PROD]# free -m
              total        used        free      shared  buff/cache   available
Mem:          10204        9249          71           4         883         865
Swap:          2047        2047           0

The problem is that there are 3 old fedora 28 virt instances hanging around. It seems like they are failing, but not exiting cleanly.

I'll kill them and see if it helps any, but I think they might pile up again. ;(

It seems insufficient memory issues is happening quite frequently on both ppc64le image builders buildvm-ppc64le-02 (with Fedora-AtomicHost-29_Update-20190215.0) and buildvm-ppc64le-01 (with Fedora-AtomicHost-29-20190214.0)

I cleared all old qemu's from both:

buildvm-ppc64le-01.ppc.fedoraproject.org | CHANGED | rc=0 >>
              total        used        free      shared  buff/cache   available
Mem:          10204        1087        6644           3        2472        9027
Swap:          2047          88        1959

buildvm-ppc64le-02.ppc.fedoraproject.org | CHANGED | rc=0 >>
              total        used        free      shared  buff/cache   available
Mem:          10204         988        8526           2         690        9127
Swap:          2047         130        1917

I guess lets see what it looks like over the weekend...