netdev - ipv6_route flags RTF_ADDRCONF and RTF_PREFIX_RT are not cleared when static on-link routes are added during IPv6 address configuration

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Message-ID: <ba807d39aca5b4dcf395cc11dca61a130a52cfd3.camel@gmail.com>
Date: Thu, 16 Oct 2025 00:12:40 +0200
From: Garri Djavadyan <g.djavadyan@...il.com>
To: netdev@...r.kernel.org
Cc: 1117959@...s.debian.org
Subject: ipv6_route flags RTF_ADDRCONF and RTF_PREFIX_RT are not cleared
 when static on-link routes are added during IPv6 address configuration

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