[Bug 2096914] Re: rsync 3.3.0-1ubuntu0.1 patch breaks IPv6 over SSH: "ssh: Could not resolve hostname x: Name or service not known"

[jehon]

And I can confirm that the Debian version fix the problem. But strange
enough, the 3.3.0 package bundle rsync 3.4.0

http://http.us.debian.org/debian/pool/main/r/rsync/rsync_3.3.0+ds1-4_amd64.deb

rsync  version 3.4.0  protocol version 32
Copyright (C) 1996-2024 by Andrew Tridgell, Wayne Davison, and others.
Web site: https://rsync.samba.org/
Capabilities:
    64-bit files, 64-bit inums, 64-bit timestamps, 64-bit long ints,
    socketpairs, symlinks, symtimes, hardlinks, hardlink-specials,
    hardlink-symlinks, IPv6, atimes, batchfiles, inplace, append, ACLs,
    xattrs, optional secluded-args, iconv, prealloc, stop-at, no crtimes
Optimizations:
    SIMD-roll, no asm-roll, openssl-crypto, no asm-MD5
Checksum list:
    xxh128 xxh3 xxh64 (xxhash) md5 md4 sha1 none
Compress list:
    zstd lz4 zlibx zlib none
Daemon auth list:
    sha512 sha256 sha1 md5 md4

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https://bugs.launchpad.net/bugs/2096914

Title:
  rsync 3.3.0-1ubuntu0.1 patch breaks IPv6 over SSH: "ssh: Could not
  resolve hostname x: Name or service not known"

Status in rsync package in Ubuntu:
  Confirmed

Bug description:
  The security upgrade of rsync from 3.3.0-1 (oracular) to
  3.3.0-1ubuntu0.1 (oracular-updates) breaks my current rsync over SSH
  backup for an IPv6-only target host!:

      rsync -a --delete -s --rsh="ssh -vvvv" -p 22 /tmp/emptydir/
  admin at ipv6only.reachable.nas:/share/CACHEDEV3_DATA/targetdir

  
  3.3.0-1ubuntu0.1 outputs here:

  OpenSSH_9.7p1 Ubuntu-7ubuntu4.1, OpenSSL 3.3.1 4 Jun 2024
  debug1: Reading configuration data /etc/ssh/ssh_config
  [...]
  debug3: resolve_host: lookup ipv6only.reachable.nas:22
  ssh: Could not resolve hostname ipv6only.reachable.nas: Name or service not known
  rsync: connection unexpectedly closed (0 bytes received so far) [sender]
  rsync error: unexplained error (code 255) at io.c(232) [sender=3.3.0]

  
  while 3.3.0-1 outputs here:

  OpenSSH_9.7p1 Ubuntu-7ubuntu4.1, OpenSSL 3.3.1 4 Jun 2024
  debug1: Reading configuration data /etc/ssh/ssh_config
  [...]
  debug3: resolve_host: lookup ipv6only.reachable.nas:22
  debug3: channel_clear_timeouts: clearing
  debug3: ssh_connect_direct: entering
  debug1: Connecting to ipv6only.reachable.nas [2001:9e8:…] port 22.

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