[DRBD-announce] drbd-9.0.26-rc4

Hi,

What a week. So many changes came in. I will write some more text for the final
9.0.26. We hope to have it ready in a week from now.

This is a release candidate, please help testing it.

9.0.26-0rc4 (api:genl2/proto:86-118/transport:14)
--------
 * fix a source of possible data corruption; related to a resync and
   a primary node that is connected to the sync-source node only
 * restore protocol compatibility with 9.0.25 and earlier
 * fix for sporadic "Clearing bitmap UUID for node" log entries;
   a potential source of problems later on leading to false split-brain
   or unrelated data messages.
 * retry connect properly in case of bitmap-uuid changes during the handshake
 * complete size 0 reads immediately; some workloads (KVM and
   iscsi targets) in combination with a ZFS zvol as the backend can lead to
   a kernel OOPS in ZFS; this is a workaround in DRBD for that
 * improve error reporting for failures during attach
 * reduce lock contention on the secondary for many resources; can improve
   performance significantly
 * Compatibility with Linux 5.10

https://www.linbit.com/downloads/drbd/9.0/drbd-9.0.26-0rc4.tar.gz
https://github.com/LINBIT/drbd/commit/b6537aa8b890890a1e22aee26f65bc1c3e097b97