This is present unless you disable read only rootfs with `sudo /usr/share/vboot/bin/make_dev_ssd.sh --remove_rootfs_verification --partitions 2
` (which unfortunately makes it hard to debug :( )

The output of `lsblk --pairs --bytes --output NAME,RM,TYPE,SIZE` changes after disabling rootfs read only.

Before, some lines have RM="". After, all lines have RM="1" or RM="2". The regex misses lines with RM="" and doesn't parse enough values to pass into the BlockDevice constructor, then dies.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform/moblab/+/439a5487f9070864a879ff553282e7fad912679a

commit 439a5487f9070864a879ff553282e7fad912679a
Author: Matt Mallett <mattmallett@chromium.org>
Date: Fri Aug 10 08:44:26 2018

[moblab] Fix mobmonitor DiskCheck on wukong

The DiskCheck mobmonitor check doesn't run on wukong.
In some cases, lsblk returns an empty string for the
removable field RM="". Make the regex more robust to find an empty
string and treat it as a valid value.

BUG= chromium:871833 
TEST=osutils_unittest.py, systeminfo_unittest.py

Change-Id: I759b27369e4cb0ebdd1f8d87a2f7a6524e73410e
Reviewed-on: https://chromium-review.googlesource.com/1168599
Commit-Ready: Matt Mallett <mattmallett@chromium.org>
Tested-by: Matt Mallett <mattmallett@chromium.org>
Reviewed-by: Keith Haddow <haddowk@chromium.org>

[modify] https://crrev.com/439a5487f9070864a879ff553282e7fad912679a/src/mobmonitor/util/osutils.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform/moblab/+/eb64d6ad27ea76d2b7b811de6df185c50bae0694

commit eb64d6ad27ea76d2b7b811de6df185c50bae0694
Author: Matt Mallett <mattmallett@chromium.org>
Date: Fri Aug 10 17:12:43 2018

[moblab] Fix mobmonitor DiskCheck on wukong

The DiskCheck mobmonitor check doesn't run on wukong.
In some cases, lsblk returns an empty string for the
removable field RM="". Make the regex more robust to find an empty
string and treat it as a valid value.

BUG= chromium:871833 
TEST=osutils_unittest.py, systeminfo_unittest.py

Change-Id: I759b27369e4cb0ebdd1f8d87a2f7a6524e73410e
Reviewed-on: https://chromium-review.googlesource.com/1168599
Commit-Ready: Matt Mallett <mattmallett@chromium.org>
Tested-by: Matt Mallett <mattmallett@chromium.org>
Reviewed-by: Keith Haddow <haddowk@chromium.org>
(cherry picked from commit 439a5487f9070864a879ff553282e7fad912679a)

[modify] https://crrev.com/eb64d6ad27ea76d2b7b811de6df185c50bae0694/src/mobmonitor/util/osutils.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform/moblab/+/84630ca758217e667332e156c12c73734f8e456b

commit 84630ca758217e667332e156c12c73734f8e456b
Author: Matt Mallett <mattmallett@chromium.org>
Date: Fri Aug 10 17:13:20 2018

[moblab] Fix mobmonitor DiskCheck on wukong

The DiskCheck mobmonitor check doesn't run on wukong.
In some cases, lsblk returns an empty string for the
removable field RM="". Make the regex more robust to find an empty
string and treat it as a valid value.

BUG= chromium:871833 
TEST=osutils_unittest.py, systeminfo_unittest.py

Change-Id: I759b27369e4cb0ebdd1f8d87a2f7a6524e73410e
Reviewed-on: https://chromium-review.googlesource.com/1168599
Commit-Ready: Matt Mallett <mattmallett@chromium.org>
Tested-by: Matt Mallett <mattmallett@chromium.org>
Reviewed-by: Keith Haddow <haddowk@chromium.org>
(cherry picked from commit 439a5487f9070864a879ff553282e7fad912679a)

[modify] https://crrev.com/84630ca758217e667332e156c12c73734f8e456b/src/mobmonitor/util/osutils.py