Bug#1136792: ipv6 temp addresses renew prematurely when removing interface

From	Bastian Blank <bblank@thinkmo.de>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1136792: ipv6 temp addresses renew prematurely when removing interface
Date	2026-05-29 16:30 +0200
Message-ID	<N06nL-8MVS-1@gated-at.bofh.it> (permalink)
References	<MVc0O-5ryY-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Hi

I just tried to reproduce both problems and was unable to do so.  So
either it is fixed, which would need a new test from you, or it requires
something more.

For #1136792:

| root@localhost:~# uname -a
| Linux localhost 7.0.9+deb14-amd64 #1 SMP PREEMPT_DYNAMIC Debian 7.0.9-1 (2026-05-22) x86_64 GNU/Linux
| root@localhost:~# sysctl net.ipv6.conf.enp0s2.accept_ra net.ipv6.conf.enp0s2.use_tempaddr
| net.ipv6.conf.enp0s2.accept_ra = 1
| net.ipv6.conf.enp0s2.use_tempaddr = 2
| root@localhost:~# ip -6 addr show enp0s2
| 2: enp0s2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
|     altname enx525400123456
|     inet6 fe00::5054:ff:fe12:3456/64 scope global mngtmpaddr noprefixroute
|        valid_lft forever preferred_lft forever
|     inet6 fe00::33d3:2f4d:6038:a6cf/64 scope global temporary dynamic
|        valid_lft 172605sec preferred_lft 86140sec
|     inet6 fe80::5054:ff:fe12:3456/64 scope link proto kernel_ll
|        valid_lft forever preferred_lft forever
| root@localhost:~# ip link add dummy0 type dummy; ip link del dummy0
[wait for an RA]
| root@localhost:~# ip -6 addr show enp0s2
| 2: enp0s2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
|     altname enx525400123456
|     inet6 fe00::5054:ff:fe12:3456/64 scope global mngtmpaddr noprefixroute 
|        valid_lft forever preferred_lft forever
|     inet6 fe00::33d3:2f4d:6038:a6cf/64 scope global temporary dynamic 
|        valid_lft 171957sec preferred_lft 85492sec
|     inet6 fe80::5054:ff:fe12:3456/64 scope link proto kernel_ll 
|        valid_lft forever preferred_lft forever

For #1136793:

| root@localhost:~# sysctl net.ipv6.conf.enp0s2.temp_prefered_lft net.ipv6.conf.enp0s2.temp_valid_lft
| net.ipv6.conf.enp0s2.temp_prefered_lft = 20
| net.ipv6.conf.enp0s2.temp_valid_lft = 120
| root@localhost:~# ip -6 addr show enp0s2
| 2: enp0s2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
|     altname enx525400123456
|     inet6 fe00::5054:ff:fe12:3456/64 scope global dynamic mngtmpaddr proto kernel_ra
|        valid_lft forever preferred_lft forever
|     inet6 fe00::880d:2796:752:e81d/64 scope global temporary deprecated dynamic
|        valid_lft 90sec preferred_lft 0sec
|     inet6 fe00::58ec:7f2a:fb9b:ff7d/64 scope global temporary deprecated dynamic
|        valid_lft 93sec preferred_lft 0sec
|     inet6 fe00::c217:e2c1:af49:9bd3/64 scope global temporary deprecated dynamic
|        valid_lft 95sec preferred_lft 0sec
|     inet6 fe00::908d:7465:2536:aa55/64 scope global temporary deprecated dynamic
|        valid_lft 97sec preferred_lft 0sec
|     inet6 fe00::dd0d:8a16:e7ab:20f3/64 scope global temporary deprecated dynamic
|        valid_lft 99sec preferred_lft 0sec
|     inet6 fe00::e0ff:4df9:ee20:e60f/64 scope global temporary deprecated dynamic
|        valid_lft 101sec preferred_lft 0sec
|     inet6 fe00::b8f7:53f3:75e8:a817/64 scope global temporary deprecated dynamic
|        valid_lft 103sec preferred_lft 0sec
|     inet6 fe00::bf10:a064:68ee:f318/64 scope global temporary deprecated dynamic
|        valid_lft 105sec preferred_lft 0sec
|     inet6 fe00::4b91:791a:9dd9:95b9/64 scope global temporary deprecated dynamic
|        valid_lft 108sec preferred_lft 0sec
|     inet6 fe00::83d:cf90:bebf:844c/64 scope global temporary deprecated dynamic
|        valid_lft 109sec preferred_lft 0sec
|     inet6 fe00::cd23:48fd:d663:56ca/64 scope global temporary deprecated dynamic
|        valid_lft 112sec preferred_lft 0sec
|     inet6 fe00::3c52:34ed:c8aa:16ad/64 scope global temporary dynamic
|        valid_lft 114sec preferred_lft 1sec
|     inet6 fe00::6953:1527:57b2:c09d/64 scope global temporary dynamic
|        valid_lft 116sec preferred_lft 3sec
|     inet6 fe00::92ab:49f:2ab7:4b19/64 scope global temporary dynamic
|        valid_lft 117sec preferred_lft 4sec
|     inet6 fe00::f3d7:47fb:95cc:7080/64 scope global temporary tentative dynamic
|        valid_lft 119sec preferred_lft 6sec
|     inet6 fe80::5054:ff:fe12:3456/64 scope link proto kernel_ll
|        valid_lft forever preferred_lft forever

Bastian

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Bug#1136792: linux-image-7.0.4+deb13-amd64: ipv6 temp addresses renew prematurely when removing interface Andreas Ferber <af+debian-bugregports@chaos-agency.de> - 2026-05-16 03:30 +0200
  Bug#1136792: linux-image-7.0.4+deb13-amd64: ipv6 temp addresses renew prematurely when removing interface Salvatore Bonaccorso <carnil@debian.org> - 2026-05-16 08:30 +0200
  Processed: Re: Bug#1136792: linux-image-7.0.4+deb13-amd64: ipv6  temp addresses renew prematurely when removing interface "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-16 08:30 +0200
  Bug#1136792: ipv6 temp addresses renew prematurely when removing interface Bastian Blank <bblank@thinkmo.de> - 2026-05-29 16:30 +0200

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