HAProxy known bugs for maintenance branch 2.6 : 17

This is maintenance branch 2.6 whose latest version is 2.6.17. If your version is not the last one in the maintenance branch, you are missing fixes for known bugs, and by not updating you are needlessly taking the responsibility for the risk of unexpected service outages and exposing your web site to possible security issues.

The HAProxy development team takes a great care of maintaining stable versions so that all users can apply bug fixes without having to take the risk of upgrading to a new branch. In turn users are expected to apply the fixes when the development team estimates that they were worth being backported to stable branches. In short, if you are running any 2.6 version other than 2.6.17, you're running with known bugs.

Quick links

full changelog for 2.6 : here
browse history for 2.6 : here

Versions available in this branch

This branch contains the following releases :

Date Version Comment

2024-04-05 2.6.17 ⇐ last

2023-12-13 2.6.16

2023-08-09 2.6.15

2023-06-09 2.6.14

2023-05-02 2.6.13

2023-03-28 2.6.12

2023-03-17 2.6.11

2023-03-10 2.6.10

2023-02-14 2.6.9

2023-01-24 2.6.8

2022-12-02 2.6.7

2022-09-22 2.6.6

2022-09-03 2.6.5

2022-08-22 2.6.4

2022-08-19 2.6.3

2022-07-22 2.6.2

2022-06-21 2.6.1

2022-05-31 2.6.0

Date	Version	Comment
2024-04-05	2.6.17	⇐ last
2023-12-13	2.6.16
2023-08-09	2.6.15
2023-06-09	2.6.14
2023-05-02	2.6.13
2023-03-28	2.6.12
2023-03-17	2.6.11
2023-03-10	2.6.10
2023-02-14	2.6.9
2023-01-24	2.6.8
2022-12-02	2.6.7
2022-09-22	2.6.6
2022-09-03	2.6.5
2022-08-22	2.6.4
2022-08-19	2.6.3
2022-07-22	2.6.2
2022-06-21	2.6.1
2022-05-31	2.6.0

Fixes for known bugs pending in this branch since the last release (2.6.17)

These fixes have already been queued for the next 2.6 release but no version was released with them yet. Note that fixes are backported several at a time from the development branch to maintenance branches, and the absence of a fix here doesn't mean none will be issued soon.

Bugs are almost always tagged with a severity (some people forget the severity tag when the bug is minor). The following severities are used :

MINOR: the bug presents a limited impact and can easily be mitigated ; users rarely upgrade just for these ones ;
MEDIUM: the bug can cause some undesired behaviour and may require some tricky configuration changes to avoid hitting it ; users normally upgrade to get rid of them, or temporarily disable a functionality.
MAJOR: the bug affects short term reliability and cannot easily be worked around without a significant performance penalty or without a significant functional loss ; such bugs don't stay long in the queue without a release and users must plan an upgrade as soon as possible ;
CRITICAL: this one very rarely happens ; it indicates a short-term reliability or security issue for which there is no workaround. A release will be emitted for this fix even if it's alone and users are urged to upgrade immediately. Some distro maintainers might have been informed in advance in order to agree on a coordinated release date.

Total known bugs in the latest version of this branch by category :

Total CRITICAL MAJOR MEDIUM MINOR

17 0 0 10 7

Total	CRITICAL	MAJOR	MEDIUM	MINOR
17	0	0	10	7

Click on the subjects below to get the full description of the bug :

Merge date Subject - Severity (minor, medium, major, critical)

2024-04-19 BUG/MINOR: server: fix slowstart behavior

2024-04-19 BUG/MEDIUM: peers: Fix exit condition when max-updates-at-once is reached

2024-04-19 BUG/MEDIUM: evports: do not clear returned events list on signal

2024-04-19 BUG/MEDIUM: stconn: Don't forward channel data if input data must be filtered

2024-04-19 BUG/MEDIUM: grpc: Fix several unaligned 32/64 bits accesses

2024-04-19 BUG/MEDIUM: peers/trace: fix crash when listing event types

2024-04-19 BUG/MINOR: debug: make sure DEBUG_STRICT=0 does work as documented

2024-04-19 BUG/MINOR: http-ana: Fix TX_L7_RETRY and TX_D_L7_RETRY values

2024-04-19 BUG/MEDIUM: http-ana: Deliver 502 on keep-alive for fressh server connection

2024-04-19 BUG/MINOR: log: invalid snprintf() usage in sess_build_logline()

2024-04-19 BUG/MINOR: tools/log: invalid encode_{chunk,string} usage

2024-04-19 BUG/MINOR: log: fix lf_text_len() truncate inconsistency

2024-04-08 BUG/MEDIUM: cli: Warn if pipelined commands are delimited by a \n

2024-04-08 BUG/MINOR: ext-check: cannot use without preserve-env

2024-04-08 BUG/MEDIUM: quic: remove unsent data from qc_stream_desc buf

2024-04-08 BUG/MEDIUM: mux-quic: report early error on stream

2024-04-08 BUG/MEDIUM: cli: fix once for all the problem of missing trailing LFs

Merge date	Subject - Severity (minor, medium, major, critical)
2024-04-19	BUG/MINOR: server: fix slowstart behavior
2024-04-19	BUG/MEDIUM: peers: Fix exit condition when max-updates-at-once is reached
2024-04-19	BUG/MEDIUM: evports: do not clear returned events list on signal
2024-04-19	BUG/MEDIUM: stconn: Don't forward channel data if input data must be filtered
2024-04-19	BUG/MEDIUM: grpc: Fix several unaligned 32/64 bits accesses
2024-04-19	BUG/MEDIUM: peers/trace: fix crash when listing event types
2024-04-19	BUG/MINOR: debug: make sure DEBUG_STRICT=0 does work as documented
2024-04-19	BUG/MINOR: http-ana: Fix TX_L7_RETRY and TX_D_L7_RETRY values
2024-04-19	BUG/MEDIUM: http-ana: Deliver 502 on keep-alive for fressh server connection
2024-04-19	BUG/MINOR: log: invalid snprintf() usage in sess_build_logline()
2024-04-19	BUG/MINOR: tools/log: invalid encode_{chunk,string} usage
2024-04-19	BUG/MINOR: log: fix lf_text_len() truncate inconsistency
2024-04-08	BUG/MEDIUM: cli: Warn if pipelined commands are delimited by a \n
2024-04-08	BUG/MINOR: ext-check: cannot use without preserve-env
2024-04-08	BUG/MEDIUM: quic: remove unsent data from qc_stream_desc buf
2024-04-08	BUG/MEDIUM: mux-quic: report early error on stream
2024-04-08	BUG/MEDIUM: cli: fix once for all the problem of missing trailing LFs

Known bugs fixed in the development branch after the last commit in this branch

It is important to understand that not all of these commits are necessarily relevant to this version, but clicking on them will show the bug description. All fixes are made first in the development branch and then backported to the maintenance branches. This ensures no fix is lost when upgrading. If a fix was marked for backporting to this branch and is not there yet, it's likely that it is still missing. Do not hesitate to ask on the haproxy mailing list if you feel like a fix has been skipped.

Date Subject

2024-04-23 BUG/MEDIUM: applet: Let's applets decide if they have more data to deliver

2024-04-22 BUG/MINOR: stats: fix stot metric for listeners

2024-04-22 BUG/MINOR: backend: use cum_sess counters instead of cum_conn

2024-04-19 BUG/MEDIUM: peers: Fix state transitions of a peer

2024-04-19 BUG/MEDIUM: peers: Don't set PEERS_F_RESYNC_PROCESS flag on a peer

2024-04-19 BUG/MINOR: fd: my_closefrom() on Linux could skip contiguous series of sockets

2024-04-19 BUG/MINOR: sock: handle a weird condition with connect()

2024-04-19 BUG/MINOR: stconn: Fix sc_mux_strm() return value

Date	Subject
2024-04-23	BUG/MEDIUM: applet: Let's applets decide if they have more data to deliver
2024-04-22	BUG/MINOR: stats: fix stot metric for listeners
2024-04-22	BUG/MINOR: backend: use cum_sess counters instead of cum_conn
2024-04-19	BUG/MEDIUM: peers: Fix state transitions of a peer
2024-04-19	BUG/MEDIUM: peers: Don't set PEERS_F_RESYNC_PROCESS flag on a peer
2024-04-19	BUG/MINOR: fd: my_closefrom() on Linux could skip contiguous series of sockets
2024-04-19	BUG/MINOR: sock: handle a weird condition with connect()
2024-04-19	BUG/MINOR: stconn: Fix sc_mux_strm() return value

Back to the list of branches and versions
Back to the HAProxy page