Bug#1117959: ipv6_route flags RTF_ADDRCONF and RTF_PREFIX_RT are not cleared when static on-link routes are added during IPv6 address configuration

From	Garri Djavadyan <g.djavadyan@gmail.com>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1117959: ipv6_route flags RTF_ADDRCONF and RTF_PREFIX_RT are not cleared when static on-link routes are added during IPv6 address configuration
Date	2025-10-16 00:20 +0200
Message-ID	<LGi0F-5u9a-1@gated-at.bofh.it> (permalink)
References	<LFcgF-4JbR-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Hi Everyone,

A year ago I noticed a problem with handling ipv6_route flags that in
some scenarios can lead to reachability issues. It was reported here:

https://bugzilla.kernel.org/show_bug.cgi?id=219205


Also it was recently reported in the Debian tracker after checking if
the latest Debian stable is still affected:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1117959


Unfortunately, the Debian team cannot act on the report because no one
from the upstream kernel team has confirmed if the report in the
upstream tracker is valid or not. Therefore, I am checking if anyone
can help confirm if the observed behavior is indeed a bug.

Many thanks in advance!

Regards,
Garri

Thread

Bug#1117959: ipv6_route flags RTF_ADDRCONF and RTF_PREFIX_RT are not cleared when static on-link routes are added during IPv6 address configuration Garri Djavadyan <g.djavadyan@gmail.com> - 2025-10-13 00:00 +0200
  Bug#1117959: ipv6_route flags RTF_ADDRCONF and RTF_PREFIX_RT are not cleared when static on-link routes are added during IPv6 address configuration Salvatore Bonaccorso <carnil@debian.org> - 2025-10-13 08:30 +0200
  Processed: Re: Bug#1117959: ipv6_route flags RTF_ADDRCONF and  RTF_PREFIX_RT are not cleared when static on-link routes are added during  IPv6 address configuration "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-10-13 08:30 +0200
  Bug#1117959: ipv6_route flags RTF_ADDRCONF and RTF_PREFIX_RT are not cleared when static on-link routes are added during IPv6 address configuration Garri Djavadyan <g.djavadyan@gmail.com> - 2025-10-16 00:20 +0200
    Bug#1117959: ipv6_route flags RTF_ADDRCONF and RTF_PREFIX_RT are not cleared when static on-link routes are added during IPv6 address configuration Stephen Hemminger <stephen@networkplumber.org> - 2025-10-18 03:10 +0200
      Bug#1117959: ipv6_route flags RTF_ADDRCONF and RTF_PREFIX_RT are not cleared when static on-link routes are added during IPv6 address configuration Salvatore Bonaccorso <carnil@debian.org> - 2025-10-25 17:00 +0200
  Bug#1117959: ipv6_route flags RTF_ADDRCONF and RTF_PREFIX_RT are not cleared when static on-link routes are added during IPv6 address configuration Salvatore Bonaccorso <carnil@debian.org> - 2025-11-21 12:10 +0100
  Bug#1117959: marked as done (ipv6_route flags RTF_ADDRCONF and  RTF_PREFIX_RT are not cleared when static on-link routes are added during  IPv6 address configuration) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-12-15 21:20 +0100

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