Uncaught Exception failing on multiple builders

Builders failed on: 
- Mac Builder: 
  https://build.chromium.org/p/chromium.perf/builders/Mac%20Builder
- Win Builder: 
  https://build.chromium.org/p/chromium.perf/builders/Win%20Builder
- Win Zenbook Perf: 
https://build.chromium.org/p/chromium.perf/builders/Win%20Zenbook%20Perf
- Win x64 Builder: 
  https://build.chromium.org/p/chromium.perf/builders/Win%20x64%20Builder

All are failing with the same error:

Traceback (most recent call last):
  File "E:\b\rr\tmpcekjxu\rw\checkout\scripts\slave\.recipe_deps\depot_tools\gclient.py", line 2682, in <module>
    sys.exit(main(sys.argv[1:]))
  File "E:\b\rr\tmpcekjxu\rw\checkout\scripts\slave\.recipe_deps\depot_tools\gclient.py", line 2668, in main
    return dispatcher.execute(OptionParser(), argv)
  File "E:\b\rr\tmpcekjxu\rw\checkout\scripts\slave\.recipe_deps\depot_tools\subcommand.py", line 252, in execute
    return command(parser, args[1:])
  File "E:\b\rr\tmpcekjxu\rw\checkout\scripts\slave\.recipe_deps\depot_tools\gclient.py", line 2423, in CMDsync
    ret = client.RunOnDeps('update', args)
  File "E:\b\rr\tmpcekjxu\rw\checkout\scripts\slave\.recipe_deps\depot_tools\gclient.py", line 1500, in RunOnDeps
    work_queue.flush(revision_overrides, command, args, options=self._options)
  File "E:\b\rr\tmpcekjxu\rw\checkout\scripts\slave\.recipe_deps\depot_tools\gclient_utils.py", line 1059, in run
    self.item.run(*self.args, **self.kwargs)
  File "E:\b\rr\tmpcekjxu\rw\checkout\scripts\slave\.recipe_deps\depot_tools\gclient.py", line 885, in run
    file_list)
  File "E:\b\rr\tmpcekjxu\rw\checkout\scripts\slave\.recipe_deps\depot_tools\gclient_scm.py", line 156, in RunCommand
    return getattr(self, command)(options, args, file_list)
  File "E:\b\rr\tmpcekjxu\rw\checkout\scripts\slave\.recipe_deps\depot_tools\gclient_scm.py", line 436, in update
    self._UpdateMirror(mirror, options)
  File "E:\b\rr\tmpcekjxu\rw\checkout\scripts\slave\.recipe_deps\depot_tools\gclient_scm.py", line 860, in _UpdateMirror
    lock_timeout=getattr(options, 'lock_timeout', 0))
  File "E:\b\rr\tmpcekjxu\rw\checkout\scripts\slave\.recipe_deps\depot_tools\git_cache.py", line 512, in populate
    self._fetch(tempdir or self.mirror_path, verbose, depth)
  File "E:\b\rr\tmpcekjxu\rw\checkout\scripts\slave\.recipe_deps\depot_tools\git_cache.py", line 487, in _fetch
    raise ClobberNeeded()  # Corrupted cache.

Making this a P0: All perf tests are about to stop across most of our bots. 

Paging Infra-Troopers: do you know how we go about clobbering the cache on these builders?