HAProxy 2.3.11 was released on 2021/07/07. It added 106 new commits
after version 2.3.10.

This release is quite huge, mainly because the previous release is a bit
old. Several major bugs were fixed:

  * Amaury fixed a possible deadlock if "set maxconn server" command was used
    when there was a pending connection ready to be dequeued. This fix
    introduced another possible deadlock that was also fixed.

  * A possible infinite loop in process_stream() was fixed because a
    connection error was reported while the stream was waiting for a
    retry. The bug was happening because the previous server connection was
    only released when a new connection attempt was performed, leaving a
    place to catch unexpected connection error. Now the server connection is
    release ASAP on retry.

  * A possible race between free() and pool_alloc() in the pools lockless
    variant was fixed. The bug was always there. It is a bit tricky. For
    details see the corresponding commit and the issue #1275.

  * A bug in the HTX defragmentation was fixed. It was happening when the
    defragmentation was performed to be able to expand an HTX block. The bug
    might be encountered in the HTTP compression filter or in HTTP header

  * An old bug preventing the dequeuing process was fixed, with Pierre
    Cheynier's help. The bug was happening for servers with a very low
    maxconn because the load balancing was not skipped when a new connection
    was picked from the proxy's or server's queue.

Less important but still noticeable fixes:

  * Willy fixed a bug in the sock part leading to high CPU usage because
    some early connection failures might be missed if a connect() reported
    an error directly via the poller without ever reporting send
    readiness. It is an old bug revealed by recent changes.

  * The SHCTX code, used for the cache and the SSL sessions, was fixed to
    use thread-based locking when USE_PRIVATE_CACHE was enabled.

  * Emeric fixed several bugs on the peers to improve the synchronization
    process. He also fixed resolvers performance issues leading to watchdog
    panics when dealing with large DNS responses. In addition, many bugs
    were fixed in this area, most of them about the SRV resolution.

  * A bug in the HTTP compression that could occasionally lead to truncated
    or corrupted responses was fixed.

  * The abortonclose option was fixed.

  * A bug in lua HTTP applet was fixed to be sure to notify the producer
    side when some data are consumed by the applet, to not block data

  * The FCGI multiplexer was slightly improved to send a relative path
    instead of a normalized URI to an application and to expose
    SERVER_SOFTWARE parameter by default.

  * http-ignore-probes is now respected for H2 connections. When this option
    is set, no errors are reported anymore when connections are aborted
    during preface.

  * As a consequence of the bug fixed in the pools, the code was
    simplified. The lockless implementation is used everywhere, resulting in
    the removal of the very old locked implementation that was kept for
    non-capable architectures. As a result, threads will now be faster on
    less common architectures (e.g. i686, MIPS, PPC64, ...)

  * The "show fd" command output was fixed to displayed the server name as
    <proxy>/<server> instead of the reverse.

  * Synchronous connect when a tcpcheck is started are now properly
    handled. This fixes a bug that was happening when several connections
    come one after another.

  * "url_ip" and "url_port" sample fetches were fixed to properly handled
    url parsing error.

The rest is less visible but contains, as usual, cleanups, small fixes here and
there, improvements ... It is strongly advised to update to this version. Thanks
everyone for your help and your contributions!

Please find the usual URLs below :
   Site index       : http://www.haproxy.org/
   Discourse        : http://discourse.haproxy.org/
   Slack channel    : https://slack.haproxy.org/
   Issue tracker    : https://github.com/haproxy/haproxy/issues
   Wiki             : https://github.com/haproxy/wiki/wiki
   Sources          : http://www.haproxy.org/download/2.3/src/
   Git repository   : http://git.haproxy.org/git/haproxy-2.3.git/
   Git Web browsing : http://git.haproxy.org/?p=haproxy-2.3.git
   Changelog        : http://www.haproxy.org/download/2.3/src/CHANGELOG
   Cyril's HTML doc : http://cbonte.github.io/haproxy-dconv/

Complete changelog :
Alex (1):
      DOC: use the req.ssl_sni in examples

Alexandar Lazic (1):
      DOC/MINOR: move uuid in the configuration to the right alphabetical order

Amaury Denoyelle (5):
      BUG/MINOR: http_fetch: fix possible uninit sockaddr in fetch_url_ip/port
      BUG/MAJOR: server: prevent deadlock when using 'set maxconn server'
      BUG/MINOR: stick-table: insert srv in used_name tree even with fixed id
      BUG/MAJOR: server: fix deadlock when changing maxconn via agent-check
      REGTESTS: fix maxconn update with agent-check

Christopher Faulet (39):
      BUG/MINOR: mux-fcgi: Don't send normalized uri to FCGI application
      BUG/MINOR: htx: Preserve HTX flags when draining data from an HTX message
      BUG/MINOR: applet: Notify the other side if data were consumed by an 
      BUG/MINOR: hlua: Don't rely on top of the stack when using Lua buffers
      BUG/MINOR: stream: Decrement server current session counter on L7 retry
      BUG/MINOR: stream: Reset stream final state and si error type on L7 retry
      BUG/MINOR: checks: Handle synchronous connect when a tcpcheck is started
      BUG/MINOR: checks: Reschedule check on observe mode only if fastinter is 
      MINOR: channel: Rely on HTX version if appropriate in channel_may_recv()
      BUG/MINOR: stream-int: Don't block reads in si_update_rx() if chn may 
      MINOR: conn-stream: Force mux to wait for read events if abortonclose is 
      MEDIUM: mux-h1: Don't block reads when waiting for the other side
      BUG/MEDIUM: mux-h1: Properly report client close if abortonclose option 
is set
      REGTESTS: Add script to test abortonclose option
      BUG/MEDIUM: filters: Exec pre/post analysers only one time per filter
      BUG/MINOR: http-comp: Preserve HTTP_MSGF_COMPRESSIONG flag on the response
      BUG/MINOR: http-ana: Handle L7 retries on refused early data before K/A 
      BUG/MAJOR: stream-int: Release SI endpoint on server side ASAP on retry
      BUG/MEDIUM: compression: Add a flag to know the filter is still 
processing data
      BUG/MAJOR: htx: Fix htx_defrag() when an HTX block is expanded
      BUG/MINOR: mux-fcgi: Expose SERVER_SOFTWARE parameter by default
      DOC: lua: Add a warning about buffers modification in HTTP
      BUILD: cfgparse-ssl: Remove const from defpx param in keylog parsing 
      BUG/MEDIUM: server/cli: Fix ABBA deadlock when fqdn is set from the CLI
      BUG/MINOR: server/cli: Fix locking in function processing "set server" 
      MINOR: tcp-act: Add set-src/set-src-port for "tcp-request content" rules
      DOC: config: Add missing actions in "tcp-request session" documentation
      BUG/MINOR: tcpcheck: Fix numbering of implicit HTTP send/expect rules
      BUG/MINOR: server-state: load SRV resolution only if params match the 
      BUG/MINOR: server: Forbid to set fqdn on the CLI if SRV resolution is 
      MINOR: resolvers: Clean server in a dedicated function when removing a 
SRV item
      MINOR: resolvers: Remove server from named_servers tree when removing a 
SRV item
      BUG/MEDIUM: resolvers: Add a task on servers to check SRV resolution 
      BUG/MINOR: resolvers: Use resolver's lock in resolv_srvrq_expire_task()
      BUG/MINOR: resolvers: Always attach server on matching record on 
      BUG/MINOR: resolvers: Reset server IP when no ip is found in the response
      MINOR: resolvers: Reset server IP on error in 
      BUG/MEDIUM: resolvers: Make 1st server of a template take part to SRV 
      Revert "MINOR: tcp-act: Add set-src/set-src-port for "tcp-request content" 

Daniel Black (1):
      DOC: config: use CREATE USER for mysql-check

Dirkjan Bussink (1):
      BUG/MINOR: checks: return correct error code for srv_parse_agent_check

Emeric Brun (17):
      BUG/MEDIUM: peers: initialize resync timer to get an initial full resync
      BUG/MEDIUM: peers: register last acked value as origin receiving a resync 
      BUG/MEDIUM: peers: stop considering ack messages teaching a full resync
      BUG/MEDIUM: peers: reset starting point if peers appears longly 
      BUG/MEDIUM: peers: reset commitupdate value in new conns
      BUG/MEDIUM: peers: re-work updates lookup during the sync on the fly
      BUG/MEDIUM: peers: reset tables stage flags stages on new conns
      MINOR: peers: add informative flags about resync process for debugging
      BUG/MEDIUM: dns: reset file descriptor if send returns an error
      BUG/MEDIUM: dns: send messages on closed/reused fd if fd was detected 
      BUG/MINOR: resolvers: answser item list was randomly purged or errors
      MEDIUM: resolvers: add a ref on server to the used A/AAAA answer item
      MEDIUM: resolvers: add a ref between servers and srv request or used SRV 
      BUG/MAJOR: resolvers: segfault using server template without SRV RECORDs
      BUG/MINOR: stick-table: fix several printf sign errors dumping tables
      DOC: stick-table: add missing documentation about gpt0 stored type
      BUG/MINOR: peers: fix data_type bit computation more than 32 data_types

Remi Tricot-Le Breton (15):
      BUG/MEDIUM: ebtree: Invalid read when looking for dup entry
      BUG/MINOR: server: Missing calloc return value check in srv_parse_source
      BUG/MINOR: peers: Missing calloc return value check in 
      BUG/MINOR: ssl: Missing calloc return value check in 
      BUG/MINOR: http: Missing calloc return value check in 
      BUG/MINOR: proxy: Missing calloc return value check in proxy_parse_declare
      BUG/MINOR: proxy: Missing calloc return value check in proxy_defproxy_cpy
      BUG/MINOR: http: Missing calloc return value check while parsing 
      BUG/MINOR: http: Missing calloc return value check while parsing 
tcp-request rule
      BUG/MINOR: compression: Missing calloc return value check in 
      BUG/MINOR: worker: Missing calloc return value check in 
      BUG/MINOR: http: Missing calloc return value check while parsing redirect 
      BUG/MINOR: http: Missing calloc return value check in make_arg_list
      BUG/MINOR: proxy: Missing calloc return value check in 
      BUG/MINOR: ssl: OCSP stapling does not work if expire too far in the 

William Lallemand (2):
      BUG/MINOR: ssl/cli: fix a lock leak when no memory available
      BUILD: make tune.ssl.keylog available again

Willy Tarreau (24):
      REGTESTS: add minimal CLI "add map" tests
      BUG/MEDIUM: cli: prevent memory leak on write errors
      MINOR: compat: automatically include malloc.h on glibc
      MEDIUM: pools: call malloc_trim() from pool_gc()
      MINOR: pools/debug: slightly relax DEBUG_DONT_SHARE_POOLS
      MINOR: debug: add a new "debug dev sym" command in expert mode
      BUG/MINOR: stream: properly clear the previous error mask on L7 retries
      BUG/MINOR: lua/vars: prevent get_var() from allocating a new name
      BUG/MINOR: pools: fix a possible memory leak in the lockless pool_flush()
      MINOR: pools: do not maintain the lock during pool_flush()
      MINOR: pools: call malloc_trim() under thread isolation
      MEDIUM: pools: use a single pool_gc() function for locked and lockless
      BUG/MAJOR: pools: fix possible race with free() in the lockless variant
      CLEANUP: pools: remove now unused seq and pool_free_list
      BUG/MEDIUM: shctx: use at least thread-based locking on USE_PRIVATE_CACHE
      BUG/MINOR: ssl: use atomic ops to update global shctx stats
      BUG/MINOR: mworker: fix typo in chroot error message
      BUG/MAJOR: queue: set SF_ASSIGNED when setting strm->target on dequeue
      MINOR: backend: only skip LB when there are actual connections
      BUG/MINOR: stats: make "show stat typed desc" work again
      MINOR: mux-h2: obey http-ignore-probes during the preface
      BUG/MEDIUM: sock: make sure to never miss early connection failures
      BUG/MINOR: cli: fix server name output in "show fd"
      DOC: peers: fix the protocol tag name in the doc

Christopher Faulet

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