Comment 4 for bug 1361378

Latest stats on this appear to only affect rackspace build nodes:

build_node
  16% devstack-trusty-rax-iad-1740349
  13% devstack-trusty-rax-iad-1718888
  11% devstack-trusty-rax-iad-1881648
  9% devstack-trusty-rax-iad-1685251
  9% devstack-trusty-rax-iad-1687403
  8% devstack-trusty-rax-iad-1708493
  7% devstack-trusty-rax-iad-1683327
  6% devstack-trusty-rax-iad-1716529
  4% devstack-trusty-rax-iad-1704847
  4% devstack-trusty-rax-iad-1683264
  3% devstack-trusty-rax-dfw-1848344
  2% devstack-trusty-rax-iad-1704962
  2% devstack-trusty-rax-iad-1703927

And there's almost no consistency about which log / tags it appears with:

tags
  24% screen-g-reg.txt screen oslofmt multiline
  18% screen-c-api.txt screen oslofmt multiline
  15% screen-n-api.txt screen oslofmt
  12% screen-n-cond.txt screen oslofmt
  8% console.html console
  5% screen-g-api.txt screen oslofmt multiline
  2% screen-c-sch.txt screen oslofmt multiline
  2% screen-n-sch.txt screen oslofmt
  1% screen-c-vol.txt screen oslofmt multiline
  1% screen-n-crt.txt screen oslofmt
  1% screen-h-api.txt screen oslofmt multiline
  1% screen-h-eng.txt screen oslofmt multiline
  1% screen-sahara.txt screen oslofmt multiline
  0% screen-h-eng.txt screen oslofmt
  0% screen-q-svc.txt screen oslofmt multiline
  0% screen-q-vpn.txt screen oslofmt multiline
  0% tempest.txt screen oslofmt multiline