Detected 8 new flakes for test/step "update_scripts". To see the actual flakes, please visit https://chromium-try-flakes.appspot.com/all_flake_occurrences?key=ahVzfmNocm9taXVtLXRyeS1mbGFrZXNyGQsSBUZsYWtlIg51cGRhdGVfc2NyaXB0cww. This message was posted automatically by the chromium-try-flakes app.

dpranke said to assign to estaab.

There's a single bot with a corrupt gclient entries file. See here for the log:
https://build.chromium.org/deprecated/tryserver.chromium.win/builders/win-msvc-rel/builds/39451/steps/update_scripts/logs/stdio

The bot is vm894-m4. Please pass to labs if you can't ssh to the bot to fix it (or maybe secondary jbudorick).

I don't know how I would fix a corrupt gclient entries file.  I'm hoping jbudorick knows, otherwise we'll need more help to work through it.

.gclient_entries was present but empty on the bot. Removed it. Will watch the next run on the bot.

(that is, E:\b\.gclient_entries)

Interesting. New error is

build_internal/scripts/slave/mediator (ERROR)
----------------------------------------
[0:00:13] Started.
_____ build_internal\scripts\slave\mediator at refs/remotes/origin/master
----------------------------------------
Error: Command 'git remote --verbose update' returned non-zero exit status 1 in E:\b\build_internal\scripts\slave\mediator
Fetching origin

From https://chrome-internal.googlesource.com/testing-infra-internal
 = [up to date]      master     -> origin/master
error: bad signature
fatal: index file corrupt
error: Could not fetch origin

which presumably is how this started.

(nuked E:\b\build_internal\scripts\slave\mediator, too)

For my own future ease: https://build.chromium.org/deprecated/tryserver.chromium.win/buildslaves/vm894-m4

Now getting the following on this machine:

INFO:recipe_engine.fetch:Running: ('git.bat', 'init', 'E:\\b\\rr\\tmp9gdhgs\\rw\\checkout')
@@@STEP_LINK@stderr-->stdio@https://logs.chromium.org/v/?s=chromium%2Fbb%2Ftryserver.chromium.win%2Fwin-msvc-rel%2F39958%2F%2B%2Frecipes%2Fstderr@@@
INFO:recipe_engine.fetch:Running: ('git.bat', '-C', 'E:\\b\\rr\\tmp9gdhgs\\rw\\checkout', 'ls-remote', 'https://chromium.googlesource.com/chromium/tools/build.git', 'refs/heads/master')
INFO:recipe_engine.fetch:Checking out '38721ba43b13821c623ef9a9eb6a3e8054994c35' in E:\b\rr\tmp9gdhgs\rw\checkout (https://chromium.googlesource.com/chromium/tools/build.git)
INFO:recipe_engine.fetch:Running: ('git.bat', '-C', 'E:\\b\\rr\\tmp9gdhgs\\rw\\checkout', 'show', '-s', '--format=%aE%n%ct%n%B', '38721ba43b13821c623ef9a9eb6a3e8054994c35')
INFO:recipe_engine.fetch:fetching https://chromium.googlesource.com/chromium/tools/build.git
INFO:recipe_engine.fetch:Running: ('git.bat', '-C', 'E:\\b\\rr\\tmp9gdhgs\\rw\\checkout', 'fetch', 'https://chromium.googlesource.com/chromium/tools/build.git', 'refs/heads/master')
INFO:recipe_engine.fetch:Running: ('git.bat', '-C', 'E:\\b\\rr\\tmp9gdhgs\\rw\\checkout', 'diff', '--quiet', '38721ba43b13821c623ef9a9eb6a3e8054994c35')
INFO:recipe_engine.fetch:Running: ('git.bat', '-C', 'E:\\b\\rr\\tmp9gdhgs\\rw\\checkout', 'reset', '-q', '--hard', '38721ba43b13821c623ef9a9eb6a3e8054994c35')
Traceback (most recent call last):
  File "E:\b\.remote_run_cipd\recipes.py", line 147, in <module>
    ret = main()
  File "E:\b\.remote_run_cipd\recipes.py", line 120, in main
    return args.func(None, args)
  File "E:\b\.remote_run_cipd\recipe_engine\remote.py", line 75, in main
    backend.checkout(revision)
  File "E:\b\.remote_run_cipd\recipe_engine\fetch.py", line 328, in checkout
    self._git('reset', '-q', '--hard', revision)
  File "E:\b\.remote_run_cipd\recipe_engine\fetch.py", line 245, in _git
    raise GitError('Git "%s" failed: %s' % (subcommand, e.message,))
GitError: Git "reset" failed: 
Uncaught exception (GitError): Git "reset" failed: 

 Issue 804117  has been merged into this issue.

Powered down the VM and filed 805598 for labs to reimage it.

Detected 16 new flakes for test/step "update_scripts". To see the actual flakes, please visit https://chromium-try-flakes.appspot.com/all_flake_occurrences?key=ahVzfmNocm9taXVtLXRyeS1mbGFrZXNyGQsSBUZsYWtlIg51cGRhdGVfc2NyaXB0cww. This message was posted automatically by the chromium-try-flakes app.

dba reimaged the machine over in 805598 & it now appears to be working again.