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

[Benjamin Schmid]

Public bug reported:

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 a 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.

** Affects: rsync (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: oracular oracular-security oracular-updates regression-release

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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:
  New

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 a 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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