Last succeeding build
https://build.chromium.org/p/client.webrtc.fyi/builders/WebRTC%20lkgr%20finder/builds/33902
First failing build
https://build.chromium.org/p/client.webrtc.fyi/builders/WebRTC%20lkgr%20finder/builds/33903

2018-02-08 16:38:00,356 |    DEBUG | infra.services.lkgr_finder.lkgr_lib | Collating builder Linux Builder (dbg)
2018-02-08 16:38:00,359 |    DEBUG | infra.libs.git | Running `git show -s --format=%B f05cf6a09c983e3e7fc054d8199d82663f55733a` with {'cwd': '/b/c/b/WebRTC_lkgr_finder/infra/infra/services/lkgr_finder/workdir/webrtc'}
Traceback (most recent call last):
  File "/b/c/b/WebRTC_lkgr_finder/infra/run.py", line 29, in <module>
    sys.exit(run_helper.run_py_main(sys.argv[1:], RUNPY_PATH, ENV_PATH, 'infra'))
  File "/b/c/b/WebRTC_lkgr_finder/infra/bootstrap/run_helper.py", line 123, in run_py_main
    runpy.run_module(args[0], run_name='__main__', alter_sys=True)
  File "/usr/lib/python2.7/runpy.py", line 176, in run_module
    fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 82, in _run_module_code
    mod_name, mod_fname, mod_loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/b/c/b/WebRTC_lkgr_finder/infra/infra/services/lkgr_finder/__main__.py", line 321, in <module>
    sys.exit(main(sys.argv[1:]))
  File "/b/c/b/WebRTC_lkgr_finder/infra/infra/services/lkgr_finder/__main__.py", line 207, in main
    builds, lkgr_builders, repo)
  File "/b/c/b/WebRTC_lkgr_finder/infra/infra/services/lkgr_finder/lkgr_lib.py", line 377, in CollateRevisionHistory
    builder_history, keyfunc=lambda x: x[0])
  File "/b/c/b/WebRTC_lkgr_finder/infra/infra/services/lkgr_finder/lkgr_lib.py", line 117, in sort
    self._cache(*map(keyfunc, revisions))
  File "/b/c/b/WebRTC_lkgr_finder/infra/infra/services/lkgr_finder/lkgr_lib.py", line 91, in _cache
    positions = self._git.number(*unknown_revs)
  File "/b/c/b/WebRTC_lkgr_finder/infra/infra/libs/git.py", line 86, in number
    out = self(*cmd)
  File "/b/c/b/WebRTC_lkgr_finder/infra/infra/libs/git.py", line 51, in __call__
    cmd, stderr=subprocess.STDOUT, **kwargs)
  File "/usr/lib/python2.7/subprocess.py", line 573, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '['git', 'show', '-s', '--format=%B', 'f05cf6a09c983e3e7fc054d8199d82663f55733a']' returned non-zero exit status 128
step returned non-zero exit code: 1


Note that all commit hashes referenced in that log are WebRTC commit hashes, however somehow Chromium's commit hash sneaked in here (the one that causes the error): crrev.com/f05cf6a09c983e3e7fc054d8199d82663f55733a

ehmaldonado@ hypothesized that it's somehow pulling information for chromium.linux's "Linux Builder (dbg)" instead of chromium.webrtc.fyi's "Linux Builder (dbg)"