Filed by sheriff-o-matic@appspot.gserviceaccount.com on behalf of mpearson@google.com

This bot has been failing for ~5 hours on bot_update step.

Uncaught Exception failing on chromium.gpu/Mac Release (Intel)

Builders failed on: 
- Mac Release (Intel): 
  https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac%20Release%20%28Intel%29

---
===Running git checkout --force e8747d07b40eaa2b6c853653405fb709f00db05d -- ===
In directory: /b/s/w/ir/cache/builder/src
===Failed in 0.2 mins of git checkout --force e8747d07b40eaa2b6c853653405fb709f00db05d -- ===
Something failed: git checkout --force e8747d07b40eaa2b6c853653405fb709f00db05d -- failed with code 255 in /b/s/w/ir/cache/builder/src..
Traceback (most recent call last):
  File "/b/s/w/ir/kitchen-checkout/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 1290, in <module>
    sys.exit(main())
  File "/b/s/w/ir/kitchen-checkout/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 1274, in main
    checkout(options, git_slns, specs, revisions, step_text, shallow)
  File "/b/s/w/ir/kitchen-checkout/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 1184, in checkout
    gclient_output = ensure_checkout(**checkout_parameters)
  File "/b/s/w/ir/kitchen-checkout/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 893, in ensure_checkout
    git_checkouts(solutions, revisions, shallow, refs, git_cache_dir, cleanup_dir)
  File "/b/s/w/ir/kitchen-checkout/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 647, in git_checkouts
    cleanup_dir)
  File "/b/s/w/ir/kitchen-checkout/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 744, in _git_checkout
    force_solution_revision(name, url, revisions, sln_dir)
  File "/b/s/w/ir/kitchen-checkout/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 592, in force_solution_revision
    git('checkout', '--force', treeish, '--', cwd=cwd)
  File "/b/s/w/ir/kitchen-checkout/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 217, in git
    return call(*cmd, **kwargs)
  File "/b/s/w/ir/kitchen-checkout/depot_tools/recipes/recipe_modules/bot_update/resources/bot_update.py", line 198, in call
    code, outval)
__main__.SubprocessFailed: git checkout --force e8747d07b40eaa2b6c853653405fb709f00db05d -- failed with code 255 in /b/s/w/ir/cache/builder/src.
step returned non-zero exit code: 1
---