drbd-9.2.13

[Philipp Reisner <philipp.reisner@linbit.com>]

Hello DRBD users,

This release brings a bunch of important fixes. The first one affects
only resources with three (or more) replicas when rs-discard-granularity
is enabled and in a specific resync scenario.

     A-->B
      \  |
       \ |
        vv
         C

A has active resyncs from A to B and from A to C, while the connection
B to C is in a paused resync state.

LINSTOR enables quorum in a 3-node system. With quorum enabled, such
a resync scenario can not occur during regular operations but only when
"re-creating" a resource, e.g., restoring a backup. We discovered this
while working on tests for our CI loop and will test this scenario as
well moving forward.

The machine freezes mentioned below were a completely different story.
Only a customer was able to reproduce them about once a day. With the
information that drbd-9.1 does not produce these machine freezes, we
finally identified a wrong use of a kernel function that led to such bad
error behavior.

I recommend upgrading to this release from older 9.2.x or 9.1.x releases.


9.2.13 (api:genl2/proto:86-101,118-122/transport:19)
--------
 * Fix a bug in the rs-discard-granularity feature; when having three
   or more replicas and after a particular resync scenario in the
   final consequence, it led to inconsistencies in the mirroring aka
   data corruption
 * Fix a bug that causes drbd not to finish a write request; DRBD
   noticed that the request did not finish and abandoned the
   connection; it happened only on resync-target primaries
 * Fix a bug that causes machine freeze (without OOPS message) under
   particular heavy network load conditions (a missing call to
   skb_abort_seq_read())
 * An up-to-date node no longer gets outdated by a far (not a
   neighbor) primary that is incapable (I.e. has an inconsistent disk
   and no access to up-to-date data)
 * Fix for a race condition between new writes getting submitted and a
   connection getting abandoned due to a send error; when it triggered,
   DRBD failed to complete a (or multiple) write request(s)
 * Fix a (never observed) race condition that causes false ping timeouts
 * Fix a minor memory leak; it failed to free the memory allocated for
   a specific class of state change log messages
 * Fix a reference counting bug in the RDMA transport upon address or
   route resolution errors
 * Fix detecting dead peers on idle connections in the RDMA transport
 * Enable TCP keepalive packets by default in the TCP transports
 * Add a DKMS package for RPM-based Linux distributions
 * Add a docker recipe for sles15
 * Compatibility with coccinelle 1.2
 * Compatibility with Linux 6.13


https://pkg.linbit.com//downloads/drbd/9/drbd-9.2.13.tar.gz
https://github.com/LINBIT/drbd/commit/0457237e0448663529fe161781873b356f17b3c5