e.g. from https://build.chromium.org/p/tryserver.chromium.android/builders/linux_android_rel_ng/builds/81537

C   23.599s Main  ********************************************************************************
C   23.599s Main  [==========] 272 tests ran.
C   23.599s Main  [  PASSED  ] 272 tests.
C   23.599s Main  ********************************************************************************
I   23.604s Main  Wrote device cache: /tmp/run12jafk/out/Release/device_cache_0384884f0ae5848c.json
I   23.606s Main  Wrote device cache: /tmp/run12jafk/out/Release/device_cache_050a4eaf218cb785.json
I   23.606s Main  Wrote device cache: /tmp/run12jafk/out/Release/device_cache_06adbcfd003b6c63.json
I   23.608s Main  Wrote device cache: /tmp/run12jafk/out/Release/device_cache_0748a5c9003bd013.json
I   23.609s Main  Wrote device cache: /tmp/run12jafk/out/Release/device_cache_0762ffbe00699694.json
I   23.610s Main  Wrote device cache: /tmp/run12jafk/out/Release/device_cache_077d67e50059ed46.json
E   31.653s Main  Unrecognized error occurred.
Traceback (most recent call last):
  File "/tmp/run12jafk/build/android/test_runner.py", line 974, in main
  File "/tmp/run12jafk/build/android/test_runner.py", line 801, in RunTestsCommand
  File "/tmp/run12jafk/build/android/test_runner.py", line 916, in RunTestsInPlatformMode
  File "/tmp/run12jafk/build/android/pylib/base/environment.py", line 33, in __exit__
  File "/tmp/run12jafk/build/android/pylib/local/device/local_device_environment.py", line 121, in TearDown
  File "/tmp/run12jafk/third_party/catapult/devil/devil/android/logcat_monitor.py", line 210, in Stop
  File "/usr/lib/python2.7/shutil.py", line 119, in copy
    copyfile(src, dst)
  File "/usr/lib/python2.7/shutil.py", line 82, in copyfile
    with open(src, 'rb') as fsrc:
IOError: [Errno 2] No such file or directory: '/tmp/tmpYqWyWF/tmpo9bJxM'