drbd-9.2.21-rc.2 and drbd-9.3.5-rc.2

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

Hi,

here is the DRBD-9.3.5-rc.2 release. I decided on a second release
candidate, as things did not calm down over the last week, which you
want before a release.

I am now targeting next week for the final release.

This is a release candidate. Please test it.


9.3.5-rc.2 (api:genl2/proto:86-101,118-125/transport:23)
--------
 * Serve changed block tracking on the drbd netlink family too, so that
   it works on kernels without the drbd2 family (before 6.2)
 * All fixes from 9.2.21-rc.2
  - Fix a sync source running out of memory when the sync target
    requests faster than it can read: a target with rs-discard-granularity
    keeps its requests within max-buffers, and the source allocates the
    pages of a resync read only when it submits the read
  - Fix resyncs in opposite directions stopping for good with
    max-parallel-resyncs: only the requesting side takes a slot
  - Fix an attaching node waiting in WFBitMapT forever while its peer
    decided there is nothing to sync
  - Fix a failed local write-zeroes leaving the old data on a disk that
    stays UpToDate
  - Fix auto-promote giving up long before auto-promote-timeout
  - Fix disconnect: the peer going to NetworkFailure instead of
    Disconnecting, and "drbdadm disconnect" failing with -18 when the
    peer tears down first
  - Fix TLS: two nodes stalling in the handshake until the TLS timeout,
    and going StandAlone when the peer resets the connection during the
    handshake
  - Fix a use-after-free of the rdma control timer on teardown
  - Fix the build on kernels before 4.17 (RHEL 7) and with Linux 7.4,
    and the send buffer not growing during a resync on Linux 7.4

9.3.5-rc.1 (api:genl2/proto:86-101,118-125/transport:23)
--------
 * Track changed blocks for incremental backups: a tracking bitmap slot
   records every write to the backing device; cbt-flush and cbt-start
   bracket a snapshot taken while I/O is suspended on all nodes
 * suspend-io now also waits for the barrier ack of the last epoch, so
   that with protocols A and B the writes are on the peers' stable
   storage too; flush-to-peers=no skips that wait
 * Add rdma2, a new RDMA transport that moves all data with one-sided
   RDMA-WRITE, sends bios zero-copy, and fails over to a surviving path
   when a link goes down
 * Serve the new drbd2 netlink family next to the drbd family
 * Optionally serve DRBD 8.4 userland over the netlink family at version
   1 (CONFIG_DRBD_NL_DRBD1, rpmbuild --with nl_drbd1,
   DEB_BUILD_OPTIONS=nl_drbd1); off by default
 * Fix lb-tcp skipping a path for good after the peer closed it first
   during a disconnect, which starved every later handshake
 * Fix spurious and racy "bitmap locked" warnings when bitmap operations
   on different peer slots run concurrently
 * All fixes from 9.2.21-rc.1
  - Fix a resync target staying Inconsistent with nothing left to sync:
    when the Primary cannot reach the sync source, after aborting a weak
    sync source, and when P_RS_CANCEL_AHEAD overtakes the Ahead state
    change
  - Fix a reconciliation resync target waiting in WFBitMapT forever, and
    out-of-sync bits from before a lost diskless Primary being dropped at
    equal dagtags
  - Fix a peer's connect-time upgrade from Outdated going unnoticed,
    which left writes unreplicated
  - Fix an Outdated sync source being marked UpToDate after a resync
    with failed blocks
  - Fix the day0 slots, a regression in 9.2.20: forget-peer left a slot
    that the next UUID bump filled with a later generation, and a peer
    created from the day0 UUID could be refused as unrelated data;
    attach repairs such meta data
  - Fix promoting a peer that holds an older generation of the data a
    diskless Primary exposes
  - Fix P_OUT_OF_SYNC: never sent for Primaries with node-id 8 or higher,
    a crash after del-peer of a Primary, and writes left pending for a
    peer that lost its connection
  - Fix the activity log: AL updates turned off while a crashed Primary
    resyncs, the superblock written too late on "al-updates no", and the
    in-core AL not written when AL updates come back on
  - Fix a dry-run connect (--tentative) establishing the connection
    without a resync
  - Fix the last close returning before the peers have the last write on
    stable storage, and auto-demote failing on a pending signal
  - Fix call-pri-lost-after-sb killing the receiver instead of demoting
  - Fix online resize: drain application I/O before the commit and before
    a participant replies, cache the peers' size answers per volume, and
    refuse a too small peer while syncing from a larger one
  - Fix a receiver deadlock at the end of a resync when the link fails
    while the bitmap is written, and bound the memory a bitmap write-out
    holds
  - Fix resync pacing: the fixed resync-rate (c-plan-ahead 0) holds, the
    resync queue at the backing device is bounded so application I/O does
    not wait behind it, and DRBD logs when max-buffers or c-max-rate
    limit a resync
  - Fix connect and disconnect issues: a spurious NetworkFailure right
    after a handshake, a stale ping timeout dropping the next connect, a
    peer's close while connecting taken as a network error, ko-count 0
    being counted down, and a second peer accepted beside a DRBD 8.4 peer
  - Fix lb-tcp: a NULL pointer dereference in the receiver, a CPU spin
    when the peer closes mid-payload, zero-length data chunks, hot-adding
    paths, and listeners left on unused paths
  - Fix rdma: use-after-free and refcount underflows on teardown during
    connect, a 60 s hang after a failed establish, going StandAlone on an
    interrupted connect, and a crash with a peer running rdma2
  - Fix the TLS handshake compat code (upstream fixes): leaks, refcount
    and use-after-free bugs, and a missing admin check on DONE
  - Fix memory corruption by peer_device flags on 32-bit kernels
  - Fix a negative ap-in-flight after a resend, BarrierAck count warnings,
    sending on after a send failed, and an unsent packet flushed at
    disconnect ("Wrong magic value" on the peer)
  - Fix attach hanging after the node was a verify target, and a double
    release when linking the holder fails
  - Show the submit and sent ages of requests in debugfs again, and mark
    peer writes that completed locally
  - Fix building SUSE KMPs on SLES 16, and the build with
    CONFIG_DRBD_TIMING_STATS


https://pkg.linbit.com//downloads/drbd/9/drbd-9.3.5-rc.2.tar.gz
https://github.com/LINBIT/drbd/commit/c75ff4bfd35ffd5eb18d9c785fcfda36b1d6bd35

https://pkg.linbit.com//downloads/drbd/9/drbd-9.2.21-rc.2.tar.gz
https://github.com/LINBIT/drbd/commit/0b6dd9039687fe61ae449cb5a2b1b6e7b5b9a4e7

cheers,
 Phil