The x86-alex canary build (1156) failed with "No space left on device" at roughly Fri Oct 21 11:00:19 2011:

Here's the extracted error

  Extracting autotest from build artifacts...
  tar: autotest/client/deps/chrome_test/test_src/chrome/test/data/profiles/typical_history/Default/History: Wrote only 5120 of 10240 bytes
  tar: autotest/client/site_tests/platform_ToolchainOptions/src/gas/config/xtensa-relax.c: Wrote only 4608 of 10240 bytes
  tar: autotest/client/site_tests/platform_ToolchainOptions/src/gas/config/obj-som.h: Cannot write: No space left on device
  tar: autotest/client/siProcess BackgroundSteps-2:4:
  Traceback (most recent call last):
    File "/usr/lib/python2.6/multiprocessing/process.py", line 232, in _bootstrap
      self.run()
    File "/b/build/slave/x86-alex-canary-master/build/chromite/buildbot/cbuildbot_background.py", line 101, in run
      traceback.print_exc(file=sys.stderr)
    File "/usr/lib/python2.6/traceback.py", line 227, in print_exc
      print_exception(etype, value, tb, limit, file)
    File "/usr/lib/python2.6/traceback.py", line 124, in print_exception
      _print(file, 'Traceback (most recent call last):')
    File "/usr/lib/python2.6/traceback.py", line 13, in _print
      file.write(str+terminator)
  IOError: [Errno 28] No space left on device

...but when kliegs logged into "chromeosbuild", he saw that there was enough space.  IRC log:

  (11:22:06 AM) kliegs: hmm. machine has 13gb free on root
  (11:22:11 AM) kliegs: and 161gb free on /b
  (11:22:18 AM) kliegs: ellyjones: build2?
  (11:22:28 AM) ellyjones: http://chromeos-botmaster.mtv.corp.google.com:8026/buildslaves/chromeosbuild2 this guy
  (11:23:55 AM) kliegs: hmm.  its got lots of space
  (11:25:09 AM) kliegs: did anyone else free up spay on chromeosbuild2?
  (11:26:31 AM) kliegs: s/spay/space
  (11:29:25 AM) kliegs: i'm showing enough space on the device.  the directory it was writing to only need half a gig more and there's more
  (11:34:13 AM) kliegs: dianders: i'm not seeing it being low enough on space to have triggered those messages