VMTests have been failing on betty-asan and amd64-generic-ubsan builders.

09:51:45: INFO: RunCommand: bin/ctest '--board=betty' '--type=vm' --no_graphics --verbose '--target_image=/b/swarming/w/ir/cache/cbuild/repository/src/build/images/betty/latest-cbuildbot/chromiumos_test_image.bin' '--test_results_root=/b/swarming/w/ir/cache/cbuild/repository/chroot/tmp/cbuildbot_yGhPp/smoke/test_harness' '--ssh_port=9228' --only_verify '--suite=smoke' --whitelist_chrome_crashes '--ssh_private_key=/b/swarming/w/ir/cache/cbuild/repository/src/build/images/betty/latest-cbuildbot/id_rsa' in /b/swarming/w/ir/cache/cbuild/repository/src/scripts
2019/01/18 09:51:46 - ctest - INFO    : Could not find a latest image to use. Using target instead.
2019/01/18 09:51:46 - cros_build_lib.py - INFO    : RunCommand: /b/swarming/w/ir/cache/cbuild/repository/src/platform/crostestutils/au_test_harness/cros_au_test_harness.py '--base_image=/b/swarming/w/ir/cache/cbuild/repository/src/build/images/betty/latest-cbuildbot/chromiumos_test_image.bin' '--target_image=/b/swarming/w/ir/cache/cbuild/repository/src/build/images/betty/latest-cbuildbot/chromiumos_test_image.bin' '--board=betty' '--type=vm' '--remote=0.0.0.0' --verbose '--jobs=7' '--ssh_private_key=/b/swarming/w/ir/cache/cbuild/repository/src/build/images/betty/latest-cbuildbot/id_rsa' '--ssh_port=9228' '--verify_suite_name=smoke' '--test_prefix=SimpleTestVerify' '--test_results_root=/b/swarming/w/ir/cache/cbuild/repository/chroot/tmp/cbuildbot_yGhPp/smoke/test_harness' --no_graphics --whitelist_chrome_crashes in /b/swarming/w/ir/cache/cbuild/repository/src/scripts
2019/01/18 09:51:46 - cros_au_test_harness.py - INFO    : No update cache found. Update testing will not work.  Run  cros_generate_update_payloads if this was not intended.
2019/01/18 09:55:59 - au_worker.py - INFO    : SimpleTestVerify: Copied shared disk image /b/swarming/w/ir/cache/cbuild/repository/src/build/images/betty/latest-cbuildbot/chromiumos_qemu_image.bin to /b/swarming/w/ir/tmp/t/cbuildbot-tmpS_4kR6/chromiumos_qemu_disk.bin.0mVul4.
2019/01/18 09:55:59 - au_worker.py - INFO    : SimpleTestVerify: Running suite:smoke suite to verify image.
2019/01/18 09:55:59 - cros_build_lib.py - INFO    : RunCommand: ./cros_run_vm_test '--board=betty' '--image-path=/b/swarming/w/ir/tmp/t/cbuildbot-tmpS_4kR6/chromiumos_qemu_disk.bin.0mVul4' '--ssh-port=9228' '--results-dir=/b/swarming/w/ir/cache/cbuild/repository/chroot/tmp/cbuildbot_yGhPp/smoke/test_harness/all/SimpleTestVerify/1_autotest_tests' '--autotest=suite:smoke' --no-display '--test_that-args=--whitelist-chrome-crashes' '--private-key=/b/swarming/w/ir/cache/cbuild/repository/src/build/images/betty/latest-cbuildbot/id_rsa' in /b/swarming/w/ir/cache/cbuild/repository/chromite/bin
09:56:01: INFO: /b/swarming/w/ir/tmp/t/cbuildbot-tmpS_4kR6/cros_vm_9228/kvm.pid does not exist.
09:56:01: DEBUG: Stop VM
09:56:01: INFO: /b/swarming/w/ir/tmp/t/cbuildbot-tmpS_4kR6/cros_vm_9228/kvm.pid does not exist.
09:56:01: DEBUG: Start VM
09:56:01: DEBUG: QEMU path: /b/swarming/w/ir/cache/cbuild/repository/chroot/usr/bin/qemu-system-x86_64
09:56:01: INFO: RunCommand: /b/swarming/w/ir/cache/cbuild/repository/chroot/usr/bin/qemu-system-x86_64 --version
09:56:05: INFO: QEMU version 3.0.0
09:56:05: DEBUG: VM image path: /b/swarming/w/ir/tmp/t/cbuildbot-tmpS_4kR6/chromiumos_qemu_disk.bin.0mVul4
09:56:05: INFO: Pid file: /b/swarming/w/ir/tmp/t/cbuildbot-tmpS_4kR6/cros_vm_9228/kvm.pid
09:56:05: INFO: RunCommand: /b/swarming/w/ir/cache/cbuild/repository/chroot/usr/bin/qemu-system-x86_64 -m 8G -smp 8 -vga virtio -daemonize -usbdevice tablet -pidfile /b/swarming/w/ir/tmp/t/cbuildbot-tmpS_4kR6/cros_vm_9228/kvm.pid -chardev 'pipe,id=control_pipe,path=/b/swarming/w/ir/tmp/t/cbuildbot-tmpS_4kR6/cros_vm_9228/kvm.monitor' -serial file:/b/swarming/w/ir/tmp/t/cbuildbot-tmpS_4kR6/cros_vm_9228/kvm.monitor.serial -mon 'chardev=control_pipe' -cpu SandyBridge,-invpcid,-tsc-deadline,check -device 'virtio-net,netdev=eth0' -netdev 'user,id=eth0,net=10.0.2.0/27,hostfwd=tcp:127.0.0.1:9228-:22' -drive 'file=/b/swarming/w/ir/tmp/t/cbuildbot-tmpS_4kR6/chromiumos_qemu_disk.bin.0mVul4,index=0,media=disk,cache=unsafe,format=raw' -enable-kvm -display none
qemu-system-x86_64: -usbdevice tablet: '-usbdevice' is deprecated, please use '-device usb-...' instead
09:56:07: INFO: RunCommand: ssh -p 9228 '-oConnectionAttempts=4' '-oUserKnownHostsFile=/dev/null' '-oProtocol=2' '-oConnectTimeout=30' '-oServerAliveCountMax=3' '-oStrictHostKeyChecking=no' '-oServerAliveInterval=10' '-oNumberOfPasswordPrompts=0' '-oIdentitiesOnly=yes' -i /b/swarming/w/ir/tmp/t/cbuildbot-tmpS_4kR6/ssh-tmpY8sV2Y/id_rsa root@localhost -- echo
09:56:38: INFO: (stdout):
Connection timed out during banner exchange

09:56:38: ERROR: Error connecting to device localhost
09:56:38: DEBUG: <class 'chromite.lib.remote_access.SSHConnectionError'>(None)
09:56:38: DEBUG: Retrying in 5.000000 (5.000000 + jitter 0.000000) seconds ...
09:56:43: INFO: RunCommand: ssh -p 9228 '-oConnectionAttempts=4' '-oUserKnownHostsFile=/dev/null' '-oProtocol=2' '-oConnectTimeout=30' '-oServerAliveCountMax=3' '-oStrictHostKeyChecking=no' '-oServerAliveInterval=10' '-oNumberOfPasswordPrompts=0' '-oIdentitiesOnly=yes' -i /b/swarming/w/ir/tmp/t/cbuildbot-tmpS_4kR6/ssh-tmpY8sV2Y/id_rsa root@localhost -- echo
09:57:13: INFO: (stdout):
Connection timed out during banner exchange