--------
 * Fix drbdsetup failing with "Operation not supported" on every command
   that names a peer; a regression of the YNL-generated netlink code in
   9.3.4-rc.1
 * Generate the netlink interface code with the upstream YNL generator
   instead of the genl_magic macro system
 * Fix a ProtocolError disconnect loop ("BAD! BarrierAck received with
   n_writes=...") when two volumes of one connection replicate and
   resync without replication at the same time
 * Tolerate a verify-alg mismatch when connecting, and refuse to start
   an online verify while the algorithms differ, instead of rejecting
   the connection outright
 * Fix several bitmap lifetime bugs around attach and detach: a NULL
   bitmap dereference in the peer device statistics, a missing bitmap
   in drbd_set_sync(), concurrent drbd_bm_free() callers, and freeing
   a bitmap that a later attach published
 * Fix a device reference leak and a NULL pointer dereference when a
   peer request's bio allocation fails under memory pressure
 * Hold state_rwlock while walking the transfer log from debugfs
 * All fixes from 9.2.20
  - Fix a secondary that stayed with the primary ending up Outdated for
    good after an isolated peer returns: an equal-UUID reconcile is now
    sourced from the node that has a primary neighbour
  - Fix two nodes ending UpToDate with different data after a reconnect
    with equal current UUIDs and out-of-sync bits standing: such bits now
    survive a resync-free connect and drive a reconciliation resync
  - Fix divergence around the end of a resync
  - Fix a node losing its obligation to start a new data generation and
    ending in a split brain
  - Fix a number of aspects of online resize
  - Fix a sync target overwriting acknowledged writes with older resync
    data when the sync source lost the diskless primary; such writes are
    now held back or postponed (new feature flag WRITE_POSTPONE) instead
    of being silently rolled back
  - Fix data corruption when a peer bitmap that is being cleared by a
    running resync was copied for a second peer
  - Fix several ways a Primary lost its obligation to start a new data
    generation after losing a peer, each ending in silent divergence,
    and a spurious I/O error when a deferred generation resumes; the
    obligation is now tracked per volume and logged
  - Fix a diskless Primary losing a peer: rotate the current UUID so the
    stale peer resyncs on return, outdate far-away members before
    resuming I/O, and keep the sole UpToDate survivor UpToDate; also
    fixes promotions freezing I/O on nodes not connected to every member
  - Fix a resync target ending with stale data or an old data generation
    when a crashed primary rejoins or a diskless primary announces a new
    generation mid-resync
  - Fix al-updates=no: honour it at attach time, and mark all bitmap
    slots out of sync after a primary crash
  - Fix kernel memory corruption by a malicious or man-in-the-middle
    peer sending out-of-range payload, drain or digest sizes, and a
    divide error caused by bogus peer block sizes
  - Fix a use-after-free of the resource when a connections dump is
    interrupted, and a refcount imbalance flooding the log with put_ldev
    assertions after a resync request allocation failure
  - Fix soft lockups: the sender thread pinning a CPU while its
    connection is down, and IRQ-disabled bitmap scans on multi-TiB
    volumes
  - Fix several deadlocks and hangs: whole-bitmap IO vs clear_peer_slot()
    or online resize, WFBitMapS on an equal-UUID reconnect with leftover
    out-of-sync bits, demotion starved by a failing connect handshake,
    and connection teardown blocked behind an unacknowledged resync
    conflict
  - Fix many two-phase-commit issues: stale replies answering the wrong
    transaction, prepared peers that disconnected, forwarding node
    handling, a state_sem leak on timeout, and unbounded connect
    retries; log which volume a connect is waiting for
  - Fix resyncs stalling short of completion, and a connection dropping
    to StandAlone when a crashed primary rejoins during a resync
  - Fix drbd_suspend_io() not waiting for in-flight writes; a detach
    hanging on a dead backing device stays interruptible
  - Fix restoring quorum after a reboot when the remaining members are
    diskless
  - Fix connection losses: online resize ending in ProtocolError,
    volume-less connections reconnecting every ping-timeout, lb-tcp
    "drbdadm down" stalling for a connect-int, and a TLS control socket
    close going unnoticed
  - Declare a connection broken where a two-phase-commit send failed,
    and repeat a disconnect without delay and with a bound; together
    they end a hanging "drbdadm disconnect"
  - Do not account requests as waiting for the activity log while it is
    suspended; the stale counters throttled resync to c-min-rate and
    drained the epoch for every incoming peer write