Starting with R71-11077.0.0 all VM tests are failing. I *think* this is the culprit since it differs from the prior working version:

2018-09-18T09:27:24.876265-07:00 INFO VM(3)[7938]: [    0.616662] virtio-mmio 17000.virtio: Wrong magic value 0x00000004!#015
2018-09-18T09:27:24.877743-07:00 INFO crash_reporter[7961]: libminijail[7961]: mount '/dev/log' -> '/dev/log' type '' flags 0x1001
2018-09-18T09:27:24.878076-07:00 INFO VM(3)[7938]: [    0.616692] virtio-mmio: probe of virtio-mmio.0 failed with error -16#015
2018-09-18T09:27:24.880373-07:00 INFO VM(3)[7938]: [    0.616703] virtio-mmio: probe of virtio-mmio.1 failed with error -16#015
2018-09-18T09:27:24.882129-07:00 INFO VM(3)[7938]: [    0.616714] virtio-mmio: probe of virtio-mmio.2 failed with error -16#015
2018-09-18T09:27:24.883843-07:00 INFO VM(3)[7938]: [    0.616725] virtio-mmio: probe of virtio-mmio.3 failed with error -16#015
2018-09-18T09:27:24.885309-07:00 INFO VM(3)[7938]: [    0.616734] virtio-mmio: probe of virtio-mmio.4 failed with error -16#015
2018-09-18T09:27:24.886556-07:00 INFO VM(3)[7938]: [    0.616744] virtio-mmio: probe of virtio-mmio.5 failed with error -16#015
2018-09-18T09:27:24.887852-07:00 INFO VM(3)[7938]: [    0.616753] virtio-mmio: probe of virtio-mmio.6 failed with error -16#015
2018-09-18T09:27:24.889061-07:00 INFO VM(3)[7938]: [    0.620737] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled#015
2018-09-18T09:27:24.889752-07:00 INFO VM(3)[7938]: [    0.621638] console [ttyS0] disabled#015
2018-09-18T09:27:24.891296-07:00 INFO VM(3)[7938]: [    0.621694] 3f8.U6_16550A: ttyS0 at MMIO 0x3f8 (irq = 0, base_baud = 115200) is a 16550A#015

Example log:

https://00e9e64bac8994f98b973bf4af17229d7313d6513b502e2bf7-apidata.googleusercontent.com/download/storage/v1/b/chromeos-autotest-results/o/239107619-chromeos-test%2Fchromeos6-row3-rack11-host13%2Ftast%2Fresults%2Fsystem_logs%2Fmessages?qk=AD5uMEt1w9NAHgzJLcAP6LodYRO_eSMFj0CtlCog6WZ9V942972V8d-6gHozWOG0qUNS7MFOTNf1-Q1VkeYaaNm4OAG--7HDrCvLD8TM5QYz1IXQSaTvg19CghOwg_jnfaq5sUbFosnIKCOG2d3jCvDAWFOai72oilcLhMoclAeQhCRfkhXi9OCKCY6iHqho1BndKIXQsjcnGzkjLFyZZAulzNWKxqA4-_RL3odtu2dERjPf-mcGB8-3Aw3tKodwBsmqhMtovUAGAoKUCNLTdEB0qsNA7B5RU-jleN5x4QYPC7lvoL1SOge0AwNNIwymTZ6YSzTe7QF9mggMIQbQ3vW1375W-zWTRwXAsLZjuO52BB88N2J5UGZnndKUJZohPgK0mje8Kp5NvCmT79Ta5auHMwrSOPKL8l_26kfqrhs0dU6DAtzK96dG1VHVtXKMIfLIX640i41Qiin5Zm2J0LAsFaehAx9QrQ-DSoUrqChiCRNUfhMVAyryGrCg2PY6LoWzmBCgrBzK79fON1b_IW23W8l3Ie7JrbKIob3MZ_7R7RxfbAvyuCJQHSCAnSHcbgs77mMirpfsyG_c8jR30P6d-YhrFTslUkuQxwclKaDndAwRNMxo_GrG0-C9AjUOBmjeVj9q-86wma0VO7bSaW1AofDWGAqetc-Jgc5ni-loJV-9QpPP9C-NU-wBTKKq2qeHvfRsN3EglH0M3-fMEY1DRYJ5Zc7d0iH21QNw4kBItuZXqoBVKwY9cMcgf49Skf1Wm2VAXfVSBePeSi7UDYJzjINVoimENWby5Li4YxylgPXszlSW9e3k7n9AxnOk5_lzmu1WHPLvzDSLkmJ9HoGxn39Eq5KbLSXefC9mNtaJaDchQt3FL6Hho4SyQvXLflBUlS3iSb3s