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	Stephen Hemminger <stephen@networkplumber.org>
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	2025-10-18 03:10 +0200
Message-ID	<LH3Ci-5ZYr-5@gated-at.bofh.it> (permalink)
References	<LGi0F-5u9a-1@gated-at.bofh.it> <LFcgF-4JbR-1@gated-at.bofh.it> <LGi0F-5u9a-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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On Thu, 16 Oct 2025 00:12:40 +0200
Garri Djavadyan <g.djavadyan@gmail.com> wrote:

> 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
> 

Linux networking does not actively use kernel bugzilla.
I forward the reports to the mailing list, that is all.
After than sometimes developers go back and update bugzilla
but it is not required or expected.

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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