$ ../../../chromite/bin/cros_fuzz_test_env  --board=amd64-generic --cleanupcros_fuzz_test_env: Unhandled exception:
Traceback (most recent call last):
  File "../../../chromite/bin/cros_fuzz_test_env", line 169, in <module>
    DoMain()
  File "../../../chromite/bin/cros_fuzz_test_env", line 165, in DoMain
    commandline.ScriptWrapperMain(FindTarget)
  File "/usr/local/google/home/manojgupta/host_migration/chromite/lib/commandline.py", line 911, in ScriptWrapperMain
    ret = target(argv[1:])
  File "/usr/local/google/home/manojgupta/host_migration/chromite/scripts/cros_fuzz_test_env.py", line 67, in main
    RunMountCommands(sysroot_path, options.cleanup)
  File "/usr/local/google/home/manojgupta/host_migration/chromite/scripts/cros_fuzz_test_env.py", line 29, in RunMountCommands
    osutils.UnmountDir(mount_path)
AttributeError: 'module' object has no attribute 'UnmountDir'


In adidtion, the call to UmountDir deletes the directories used for mounting.
So post cleanup, the call to setup doesn't work anymore.

 ../../../chromite/bin/cros_fuzz_test_env  --board=amd64-generic15:36:29: INFO: RunCommand: sudo -- mount -t proc none /usr/local/google/home/manojgupta/host_migration/chroot/build/amd64-generic/proc
mount: /usr/local/google/home/manojgupta/host_migration/chroot/build/amd64-generic/proc: mount point does not exist.
cros_fuzz_test_env: Unhandled exception:
Traceback (most recent call last):
  File "../../../chromite/bin/cros_fuzz_test_env", line 169, in <module>
    DoMain()
  File "../../../chromite/bin/cros_fuzz_test_env", line 165, in DoMain
    commandline.ScriptWrapperMain(FindTarget)
  File "/usr/local/google/home/manojgupta/host_migration/chromite/lib/commandline.py", line 911, in ScriptWrapperMain
    ret = target(argv[1:])
  File "/usr/local/google/home/manojgupta/host_migration/chromite/scripts/cros_fuzz_test_env.py", line 67, in main
    RunMountCommands(sysroot_path, options.cleanup)
  File "/usr/local/google/home/manojgupta/host_migration/chromite/scripts/cros_fuzz_test_env.py", line 38, in RunMountCommands
    cros_build_lib.SudoRunCommand(command)
  File "/usr/local/google/home/manojgupta/host_migration/chromite/lib/cros_build_lib.py", line 333, in SudoRunCommand
    return RunCommand(sudo_cmd, **kwargs)
  File "/usr/local/google/home/manojgupta/host_migration/chromite/lib/cros_build_lib.py", line 658, in RunCommand
    raise RunCommandError(msg, cmd_result)
chromite.lib.cros_build_lib.RunCommandError: return code: 32; command: sudo -- mount -t proc none /usr/local/google/home/manojgupta/host_migration/chroot/build/amd64-generic/proc
cmd=['sudo', '--', 'mount', '-t', 'proc', 'none', '/usr/local/google/home/manojgupta/host_migration/chroot/build/amd64-generic/proc']