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b=AglcN+tITejzYhWTF9NBEqeRpeNTS1K63PlodMZQajDDHh30iV0jUw3DARbwNZ2buFcUbY 6fyUU+NoSOASZkDA== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id EE038593B0; Mon, 27 Apr 2026 14:55:06 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id oTw+N8p472mGMQAAD6G6ig (envelope-from ); Mon, 27 Apr 2026 14:55:06 +0000 Message-ID: <8d648645-0352-4657-9cf0-c39a5cdc13ee@suse.de> Date: Mon, 27 Apr 2026 16:55:00 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [BUG] some temporary IPv6 address don't get regenerated To: =?UTF-8?Q?=C5=81ukasz_Stelmach?= , netdev@vger.kernel.org References: <87340td30q.fsf%steelman@post.pl> Content-Language: en-US From: Fernando Fernandez Mancera In-Reply-To: <87340td30q.fsf%steelman@post.pl> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-4.51 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RCVD_TLS_ALL(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:106:10:150:64:167:received]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; DWL_DNSWL_BLOCKED(0.00)[suse.de:dkim]; RCPT_COUNT_TWO(0.00)[2]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,suse.de:mid,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DKIM_TRACE(0.00)[suse.de:+] X-Rspamd-Action: no action X-Spam-Flag: NO X-Spam-Score: -4.51 X-Spam-Level: X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Queue-Id: 221AD6A89C On 4/17/26 5:23 PM, Łukasz Stelmach wrote: > Hi, > > Apparently, something in addrconf.c can go wrong and a temporary > addresses may not get regenerated leaving users who wish to use them > with only the stable ones. Below, 2a01:110f:4321:1002:abcc:78d7:2055:94ec > while still valid is not preferred anymore. Even if it's not the only > global temporary address it is the only usable to contact hosts on the > Internet because the other temporary addresses are ULA. > Hi, I managed to reproduce this, it took me quite some time. It looks like a race condition somewhere. I am working on a fix and I will add a selftest covering this too. Ideally, I will send a fix this week. I am now checking if this was introduced recently or was always broken. > Neither received RAs nor adding and removing an address manually (one > with a different prefix unrelated to these below) which as far as I > understand, should trigger address maintenance code. > Yup, same situation here. Thanks, Fernando. > I noticed this phenomenon once or twice before. It seems to be very > rare, yet quite undesirable I'd say. What might have triggered it today > is a reboot of my router and (possible?) change in lifetime values it > announced. > > Even stranger is that there is a preferred fd89:: (ULA), but not 2a01::. > > accept_ra as well as use_tempaddr are set to 2. > > Of course, this ma be get fixed by a suspend/resume (no, it may not) or > manual ifdown/ifup (of course it helped), but nevertheless I thought it > was worth reporting. > > --8<---------------cut here---------------start------------->8--- > 107: bond0: mtu 1500 qdisc noqueue state UP group default qlen 1000 > link/ether b8:ca:3a:d4:1e:97 brd ff:ff:ff:ff:ff:ff > inet 192.168.2.122/24 brd 192.168.2.255 scope global dynamic bond0 > valid_lft 165585sec preferred_lft 165585sec > > inet6 fd89:82bb:420:2:cab3:d2d6:aeeb:e250/64 scope global temporary dynamic > valid_lft 597079sec preferred_lft 78177sec > > inet6 2a01:110f:4321:1002:abcc:78d7:2055:94ec/64 scope global temporary deprecated dynamic > valid_lft 60815sec preferred_lft 0sec > > inet6 2a01:110f:4321:1002:abac:3aff:fed4:beef/64 scope global dynamic mngtmpaddr proto kernel_ra > valid_lft 60815sec preferred_lft 60815sec > > inet6 fd89:82bb:420:2:24bf:fe8f:5c9c:c753/64 scope global temporary deprecated dynamic > valid_lft 511186sec preferred_lft 0sec > > inet6 fd89:82bb:420:2:abac:3aff:fed4:beef/64 scope global dynamic mngtmpaddr proto kernel_ra > valid_lft 2591805sec preferred_lft 604605sec > > inet6 fe80::abac:3aff:fed4:beef/64 scope link proto kernel_ll > valid_lft forever preferred_lft forever > --8<---------------cut here---------------end--------------->8--- >