[DRBD-announce] drbd-9.0.25-rc1

Hi,

The main reason to do a release is that with 9.0.25 the overhead submitting
IO got smaller. On some specific hardware the fio results go from IOPS=229k,
BW=896MiB/s to IOPS=370k, BW=1445MiB/s (single DRBD device).
Especially with multiple or many DRBD devices on a single server, the
improvement
might be significant.
Other than that there are a number of bug fixes. None of the fixed bugs was
especially spectacular. Generally speaking update will be recommended
as soon as we have the final release.

This is a release candidate, please help testing it.

Changelog:
9.0.25-0rc1 (api:genl2/proto:86-117/transport:14)
--------
 * fix a race condition between receiving UUIDs and finishing a resync
   that can lead to a false-positive split-brain detection later on
 * fix access after free of peer_req objects, that only happened when
   a resync target node is paused sync source at the same time
 * fix abortion of local state changes in case they can not proceed due
   to loss of connection
 * fix corner cases with reconciliation resync and parallel promote
 * fix an issue establishing a connection when the multipath feature is
   used to connect to a stacked resource without a dedicated service IP
 * fix sometimes a peer-disk state to another resync-target staying Outdated
   after two resyncs from the same sync source node finish
 * fix an (unlikely) deadlock while establishing a connection
 * deactivate the kref_debug code, it has performance implications
 * Introduce the "disconnected" hander; it receives the last connection
   state in the environment variable DRBD_CSTATE

https://www.linbit.com/downloads/drbd/9.0/drbd-9.0.25-0rc1.tar.gz
https://github.com/LINBIT/drbd/commit/bd41626d3fdc7b6f575532020ff9ce1c9c4bf29b

best regards,
 Phil