Bug#1133842: libnss-resolve: libnss_resolve fails resolving PTR records for IPv4 addresses

[Marco Moock]

Package: libnss-resolve
Version: 257.9-1~deb13u1
Severity: normal
Tags: ipv6 upstream

Dear Maintainer,

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I installed Debian 13.4 on the Raspberry Pi. This comes with
systemd-resolve preconfigured.

nsswitch included:
hosts:          files myhostname resolve [!UNAVAIL=return] dns

I noticed that resolving the PTR records for IPv4 addresses
(3.2.1.10.in-addr.arpa) does not work if "resolve [!UNAVAIL=return]" is included in the
nsswitch.conf. If I send that query directly via DNS to the server
listed in resolv.conf (127.0.0.53), it works.

That's why I assume an issue with libnss_resolve.

I only have IPv6 upstream DNS servers set that can properly resolve the
query.

This might be related to https://github.com/systemd/systemd/issues/29069


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-- System Information:
Debian Release: 13.4
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: arm64 (aarch64)

Kernel: Linux 6.12.74+deb13+1-arm64 (SMP w/4 CPU threads)
Kernel taint flags: TAINT_WARN, TAINT_CRAP
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libnss-resolve depends on:
ii  libc6             2.41-12+deb13u2
ii  libcap2           1:2.75-10+b8
ii  systemd-resolved  257.9-1~deb13u1

libnss-resolve recommends no packages.

libnss-resolve suggests no packages.

-- no debconf information