The security.SELinuxFileLabel Tast test is failing due to /etc/hosts.d not being present on some DUTs. The test possibly needs to be updated to permit it to not exist:

2018/10/03 00:12:36 Started test security.SELinuxFileLabel
2018/10/03 00:12:36 [00:12:35.744] Error at file_label_utils.go:70: Failed file context check for /etc/hosts.d: failed to get file context: no such file or directory

http://stainless/browse/chromeos-autotest-results/244590777-chromeos-test/

The test panics after this due to a nil pointer dereference:

2018/10/03 00:12:36 [00:12:35.744] Error at test.go:175: Panic: runtime error: invalid memory address or nil pointer dereference
2018/10/03 00:12:36 [00:12:35.744] Stack trace:
chromiumos/tast/testing.runAndRecover.func1(0xc420312a50)
	/build/asuka/tmp/portage/chromeos-base/tast-local-tests-cros-0.0.1-r199/work/tast-local-tests-cros-0.0.1/tast-base/src/chromiumos/tast/testing/test.go:175 +0xa3
panic(0x6506398aef00, 0x650639bf4be0)
	/usr/lib/go/x86_64-cros-linux-gnu/src/runtime/panic.go:502 +0x22d
chromiumos/tast/local/bundles/cros/security/selinux.CheckContext(0xc420312a50, 0x65063971c3b4, 0xc, 0x65063973168a, 0x24, 0x1, 0x650639972438)
	/build/asuka/tmp/portage/chromeos-base/tast-local-tests-cros-0.0.1-r199/work/tast-local-tests-cros-0.0.1/src/chromiumos/tast/local/bundles/cros/security/selinux/file_label_utils.go:74 +0xd7
chromiumos/tast/local/bundles/cros/security.SELinuxFileLabel(0x65063997f260, 0xc4201c8cc0, 0xc420312a50)
	/build/asuka/tmp/portage/chromeos-base/tast-local-tests-cros-0.0.1-r199/work/tast-local-tests-cros-0.0.1/src/chromiumos/tast/local/bundles/cros/security/selinux_file_label.go:142 +0x5b3

The fix for the panic seems trivial; I'll upload a one-line change.