Error output:
======================================================================


ChromeUserLevel: no_pv -> install_chrome_user -> chrome_user_installed_not_inuse -> uninstall_chrome_user -> clean
 ... [0418/183947:test_installer.py(143)] Verifying state no_pv
[0418/183947:test_installer.py(109)] Beginning action install_chrome_user
[0418/183955:test_installer.py(112)] Finished action install_chrome_user
[0418/183955:test_installer.py(143)] Verifying state chrome_user_installed_not_inuse
FAIL
ChromeSystemLevel: no_pv -> install_chrome_system -> chrome_system_installed_not_inuse -> uninstall_chrome_system -> clean
 ... [0418/183956:test_installer.py(143)] Verifying state no_pv
[0418/183956:test_installer.py(109)] Beginning action install_chrome_system
[0418/184004:test_installer.py(112)] Finished action install_chrome_system
[0418/184004:test_installer.py(143)] Verifying state chrome_system_installed_not_inuse
FAIL

======================================================================
FAIL: ChromeUserLevel: no_pv -> install_chrome_user -> chrome_user_installed_not_inuse -> uninstall_chrome_user -> clean

----------------------------------------------------------------------
Traceback (most recent call last):
  File "E:\b\build\slave\Win10_Tests_x64\build\src\chrome\test\mini_installer\test_installer.py", line 115, in runTest
    self._VerifyState(state)
  File "E:\b\build\slave\Win10_Tests_x64\build\src\chrome\test\mini_installer\test_installer.py", line 150, in _VerifyState
    raise AssertionError("In state '%s', %s" % (state, e))
AssertionError: In state 'chrome_user_installed_not_inuse', Process C:\Users\chrome-bot\AppData\Local\Chromium\Application\chrome.exe is running

======================================================================
FAIL: ChromeSystemLevel: no_pv -> install_chrome_system -> chrome_system_installed_not_inuse -> uninstall_chrome_system -> clean

----------------------------------------------------------------------
Traceback (most recent call last):
  File "E:\b\build\slave\Win10_Tests_x64\build\src\chrome\test\mini_installer\test_installer.py", line 115, in runTest
    self._VerifyState(state)
  File "E:\b\build\slave\Win10_Tests_x64\build\src\chrome\test\mini_installer\test_installer.py", line 150, in _VerifyState
    raise AssertionError("In state '%s', %s" % (state, e))
AssertionError: In state 'chrome_system_installed_not_inuse', Process C:\Program Files (x86)\Chromium\Application\chrome.exe is running

----------------------------------------------------------------------

The https://chromium.googlesource.com/chromium/src/+log/master/chrome/test/mini_installer/test_installer.py file itself hasn't been changed for over a year.

The first failure is at the step chrome_user_installed_not_inuse (https://code.google.com/p/chromium/codesearch#chromium/src/chrome/test/mini_installer/config/config.config&l=12-17). This tests the state of registries, running processes etc. The second failure is similar.

+cc grt@ as the owner.

In the meantime, +phajdan@ as the trooper: Could you please try restarting the bot, in case this is just some transient error on that particular Windows machine? (https://build.chromium.org/p/chromium.win/buildslaves/vm6-m1)

phajdan.jr@ friendly ping!