Description of problem:

When running F18 in a VM using spice + qxl (gnome-shell running on llvmpipe as desktop) qxl floods the Xorg.0.log with:

-------------------
[  1065.730] - 0th attempt
[  1065.730] - OOM at 13 817 24 (= 31863 bytes)
[  1065.730] Cache contents:  null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null  963 1000 1016  919 1015 1002  921  939  897 1022  909  980     total: 12
[  1065.740] - 1th attempt
[  1065.740] - OOM at 13 817 24 (= 31863 bytes)
[  1065.740] Cache contents:  null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null  963 1000 1016  919 1015 1002  921  939  897 1022  909  980     total: 12
[  1065.751] - 2th attempt
[  1065.751] - OOM at 13 817 24 (= 31863 bytes)
[  1065.751] Cache contents:  null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null null  963 1000 1016  919 1015 1002  921  939  897 1022  909  980     total: 12
[  1065.761] Out of video memory: Could not allocate 42536 bytes
----------------

Does not seem to stop doing so...

Screen resolution is 1280x800; the guest has access to 5000MB of memory