As far as I can tell, the latest kmod-kvdo package for SL7.5 is
version 6.1.0-171-17.el7_5:

  $ rpm -q --requires -p
./x86_64/updates/fastbugs/kmod-kvdo-6.1.0.171-17.el7_5.x86_64.rpm |
grep dm_get_device
  kernel(dm_get_device) = 0xf3d46cd5

...while the latest kernel package is version 3.10.0-862-6.3.el7:

  $ rpm -q --provides -p
./x86_64/updates/security/kernel-3.10.0-862.6.3.el7.x86_64.rpm | grep
dm_get_device
  kernel(dm_get_device) = 0x602cd186

As you can see from the requires/provides, these packages are
incompatible. (A few other dm_xxx symbols are similarly mismatched.)

Note that the next-to-latest kernel, 3.10.0-862.3.3, provides the
symbol versions that the latest kmod-kvdo is expecting. So it appears
that kmod-kvdo is out of date (?)

 - Pat