https://luci-milo.appspot.com/buildbot/chromeos/kahlee-paladin/1608

cros-disks-0.0.1-r2501: [0313/221011:ERROR:mounter.cc(43)] Failed to mount '/nonexistent' to '/tmp/.org.chromium.Chromium.dcoEGc' as filesystem 'ext2' with options 'ro'
cros-disks-0.0.1-r2501: [       OK ] SystemMounterTest.RunAsRootMountWithNonexistentSourcePath (0 ms)
cros-disks-0.0.1-r2501: [ RUN      ] SystemMounterTest.RunAsRootMountWithNonexistentTargetPath
cros-disks-0.0.1-r2501: [0313/221011:WARNING:system_mounter.cc(34)] mount('/dev/null', '/nonexistent', 'tmpfs', 1, '') failed: No such file or directory
cros-disks-0.0.1-r2501: [0313/221011:ERROR:mounter.cc(43)] Failed to mount '/dev/null' to '/nonexistent' as filesystem 'tmpfs' with options 'ro'
cros-disks-0.0.1-r2501: [       OK ] SystemMounterTest.RunAsRootMountWithNonexistentTargetPath (0 ms)
cros-disks-0.0.1-r2501: [ RUN      ] SystemMounterTest.RunAsRootMountWithNonexistentFilesystemType
cros-disks-0.0.1-r2501: [0313/221011:WARNING:system_mounter.cc(34)] mount('/dev/null', '/tmp/.org.chromium.Chromium.iUJGTx', 'nonexistentfs', 1, '') failed: No such device
cros-disks-0.0.1-r2501: [0313/221011:ERROR:mounter.cc(43)] Failed to mount '/dev/null' to '/tmp/.org.chromium.Chromium.iUJGTx' as filesystem 'nonexistentfs' with options 'ro'
cros-disks-0.0.1-r2501: [       OK ] SystemMounterTest.RunAsRootMountWithNonexistentFilesystemType (2 ms)
cros-disks-0.0.1-r2501: [----------] 4 tests from SystemMounterTest (19 ms total)
cros-disks-0.0.1-r2501: 
cros-disks-0.0.1-r2501: [----------] Global test environment tear-down
cros-disks-0.0.1-r2501: [==========] 4 tests from 1 test case ran. (19 ms total)
cros-disks-0.0.1-r2501: [  PASSED  ] 4 tests.
cros-disks-0.0.1-r2501: /build/kahlee/tmp/portage/chromeos-base/cros-disks-0.0.1-r2501/work/cros-disks-0.0.1/common-mk/platform2_test.py --action=run --sysroot=/build/kahlee --gtest_filter=-*.RunAsRoot*: -- /build/kahlee/var/cache/portage/chromeos-base/cros-disks/out/Default/disks_testrunner
cros-disks-0.0.1-r2501: ERROR: ld.so: object 'libsandbox.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
cros-disks-0.0.1-r2501: chroot: /build/kahlee
cros-disks-0.0.1-r2501: cwd: /tmp/portage/chromeos-base/cros-disks-0.0.1-r2501/work/cros-disks-0.0.1/cros-disks
cros-disks-0.0.1-r2501: cmd: {/var/cache/portage/chromeos-base/cros-disks/out/Default/disks_testrunner} '/var/cache/portage/chromeos-base/cros-disks/out/Default/disks_testrunner' '--gtest_filter=-*.RunAsRoot*'
cros-disks-0.0.1-r2501: Note: Google Test filter = -*.RunAsRoot*
cros-disks-0.0.1-r2501: [==========] Running 440 tests from 18 test cases.
cros-disks-0.0.1-r2501: [----------] Global test environment set-up.
cros-disks-0.0.1-r2501: [----------] 9 tests from ArchiveManagerTest
cros-disks-0.0.1-r2501: [ RUN      ] ArchiveManagerTest.CanMount
cros-disks-0.0.1-r2501: [       OK ] ArchiveManagerTest.CanMount (0 ms)
cros-disks-0.0.1-r2501: [ RUN      ] ArchiveManagerTest.CanUnmount
cros-disks-0.0.1-r2501: [       OK ] ArchiveManagerTest.CanUnmount (0 ms)
cros-disks-0.0.1-r2501: [ RUN      ] ArchiveManagerTest.DoMountFailedWithUnsupportedExtension
cros-disks-0.0.1-r2501: [0313/221012:ERROR:serialization_utils.cc(277)] /var/lib/metrics/uma-events: cannot open: No such file or directory
cros-disks-0.0.1-r2501: [0313/221012:WARNING:metrics.cc(73)] Failed to send archive type sample to UMA
cros-disks-0.0.1-r2501: [0313/221012:ERROR:archive_manager.cc(134)] Path '/media/archive/test.zip/doc.zip' is not a supported archive

cros-disks-0.0.1-r2501: [0313/220606:ERROR:mounter.cc(43)] Failed to mount '/dev/sdb1' to '/media/disk' as filesystem 'vfat' with options 'ro,nodev,noexec,nosuid'
cros-disks-0.0.1-r2501: [       OK ] MounterTest.MountReadWriteAndReadOnlyFailed (0 ms)
cros-disks-0.0.1-r2501: [----------] 5 tests from MounterTest (0 ms total)
cros-disks-0.0.1-r2501: 
cros-disks-0.0.1-r2501: [----------] 25 tests from PlatformTest
cros-disks-0.0.1-r2501: [ RUN      ] PlatformTest.GetRealPath
cros-disks-0.0.1-r2501: [0313/220606:ERROR:platform.cc(45)] Failed to get real path of '': No such file or directory
cros-disks-0.0.1-r2501: [0313/220606:ERROR:platform.cc(45)] Failed to get real path of '/nonexistent': No such file or directory
cros-disks-0.0.1-r2501: [       OK ] PlatformTest.GetRealPath (0 ms)
cros-disks-0.0.1-r2501: [ RUN      ] PlatformTest.CreateDirectory
cros-disks-0.0.1-r2501: [0313/220606:INFO:platform.cc(58)] Created directory '/tmp/.org.chromium.Chromium.a4K3cQ/test'
cros-disks-0.0.1-r2501: [0313/220606:INFO:platform.cc(58)] Created directory '/tmp/.org.chromium.Chromium.a4K3cQ/test'
cros-disks-0.0.1-r2501: [0313/220606:INFO:platform.cc(58)] Created directory '/tmp/.org.chromium.Chromium.a4K3cQ/test'
cros-disks-0.0.1-r2501: [       OK ] PlatformTest.CreateDirectory (1 ms)
cros-disks-0.0.1-r2501: [ RUN      ] PlatformTest.CreateOrReuseEmptyDirectory
cros-disks-0.0.1-r2501: [0313/220606:ERROR:platform.cc(70)] Failed to create directory '/tmp/.org.chromium.Chromium.p35UNE/test': File exists
cros-disks-0.0.1-r2501: [       OK ] PlatformTest.CreateOrReuseEmptyDirectory (0 ms)
cros-disks-0.0.1-r2501: [ RUN      ] PlatformTest.CreateOrReuseEmptyDirectoryWithFallback
cros-disks-0.0.1-r2501: [0313/220606:ERROR:platform.cc(70)] Failed to create directory '/tmp/.org.chromium.Chromium.aLuQot/test1': File exists
cros-disks-0.0.1-r2501: [0313/220606:ERROR:platform.cc(70)] Failed to create directory '/tmp/.org.chromium.Chromium.aLuQot/test1': File exists
cros-disks-0.0.1-r2501: [0313/220606:ERROR:platform.cc(70)] Failed to create directory '/tmp/.org.chromium.Chromium.aLuQot/test1': File exists
cros-disks-0.0.1-r2501: [0313/220606:ERROR:platform.cc(70)] Failed to create directory '/tmp/.org.chromium.Chromium.aLuQot/test1': File exists
cros-disks-0.0.1-r2501: [0313/220606:ERROR:platform.cc(70)] Failed to create directory '/tmp/.org.chromium.Chromium.aLuQot/test1 (1)': File exists
cros-disks-0.0.1-r2501: [0313/220606:ERROR:platform.cc(70)] Failed to create directory '/tmp/.org.chromium.Chromium.aLuQot/test1': File exists
cros-disks-0.0.1-r2501: [0313/220606:ERROR:platform.cc(70)] Failed to create directory '/tmp/.org.chromium.Chromium.aLuQot/test1 (1)': File exists

All CLs are innocent and submitted without updates later. It should be a flaky unittest. Close it for now. If it happens again, we can re-open it.