Upstream fixed this in device-mapper with:
Author: Mike Snitzer <email address hidden> dm: fix potential for q->make_request_fn NULL pointer
This is to be included in:
Xenial: Ubuntu-4.4.0-177.207 (committed) Bionic: Ubuntu-4.15.0-92.93 (committed, not prepared yet) Eoan: Ubuntu-5.3.0-43.35 (committed) Focal: Ubuntu-5.4.0-15.18 (released, revert of SAUCE committed)
Upstream fixed this in device-mapper with:
Author: Mike Snitzer <email address hidden>
dm: fix potential for q->make_request_fn NULL pointer
This is to be included in:
Xenial: Ubuntu- 4.4.0-177. 207 (committed)
Bionic: Ubuntu-4.15.0-92.93 (committed, not prepared yet)
Eoan: Ubuntu-5.3.0-43.35 (committed)
Focal: Ubuntu-5.4.0-15.18 (released, revert of SAUCE committed)