There are a fair number of regularly failures in platform_MemCheck:

https://bugs.chromium.org/p/chromium/issues/list?can=1&q=platform_MemCheck+autofiled&sort=-id&colspec=ID+Pri+M+Stars+ReleaseBlock+Component+Status+Owner+Summary+OS+Modified+autofiled&x=m&y=releaseblock&cells=ids

The two most recent failures on different board have roughly identical symptoms:

03/21 16:58:27.297 INFO |      base_sysinfo:0380| ChromeOS BOARD = daisy_skate_1.7GHz_2GB
03/21 16:58:27.357 INFO | platform_MemCheck:0064| board: daisy_skate, phy_size: 2097152 memref: 1497152
03/21 16:58:27.378 WARNI| platform_MemCheck:0079| SwapTotal is 0
03/21 16:58:27.389 WARNI| platform_MemCheck:0080| SwapTotal should be within 10% of 2000108
03/21 16:58:27.464 INFO | platform_MemCheck:0103| dimm #0 timings: DDR3-1600
03/21 16:58:27.465 INFO | platform_MemCheck:0103| dimm #1 timings: DDR3-1600
03/21 16:58:27.622 WARNI|              test:0615| The test failed with the following exception
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 609, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/common_lib/test.py", line 817, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/common_lib/test.py", line 470, in execute
    dargs)
  File "/usr/local/autotest/common_lib/test.py", line 347, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/common_lib/test.py", line 380, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/tests/platform_MemCheck/platform_MemCheck.py", line 129, in run_once
    raise error.TestFail('Found incorrect values: %s' % error_list_str)

It seems suspicious that "SwapTotal is 0".