Hi,
This is an unusual release. This time, we fixed more issues than in
any previous development cycle. This is because the team has used
ClaudeCode since the start of the Year. It took about half a year,
from our first experiments with it, to get to the point where we can
do much more in a cycle than before.
It helps extract the important needle from a haystack of loglines. It
also helps us write reproducers super quickly using our testing
framework. It enabled us to create new static analyzers tailored for
DRBD. It enabled us to create a simulator that lets us test the DRBD
code deterministically against unusual timings that are very hard to
reproduce on regular VMs.
Last but not least, it is much quicker than a human at coming up with
patch proposals. Even if you have to reject three, you may be
impressed by the solution when you review the fourth proposal.
The drbd-9.3.4-rc.1 will follow as soon as possible. I hope tomorrow.
This is a release candidate. Please test it.
9.2.20-rc.1 (api:genl2/proto:86-101,118-124/transport:21)
--------
* 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
https://pkg.linbit.com//downloads/drbd/9/drbd-9.2.20-rc.1.tar.gz
cheers,
Phil