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Description of problem:
If the device underneath VDO issues an error for a flush, VDO will ignore that error and proceed. This may result in silent data corruption, as those flushes succeeding are necessary for data integrity.

Version-Release number of selected component (if applicable):
6.2.3.107

How reproducible:
Difficult.

Steps to Reproduce:
1. Run VDO on a device which fails and ignores at least some incoming flushes, but no incoming reads/writes.
2. Write some data to VDO.
3. Crash and restart VDO.

Actual results:
VDO will likely go readonly eventually from metadata inconsistency, as well as possible data corruption.


Expected results:
VDO goes read-only immediately upon a failed flush.

Additional info:
Present from 8.0 to the present 6.2.3.107.

Verified SanityOnly. Regression testing passed

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (kmod-kvdo bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:4551