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Bug#1024070: linux-image-6.0.0-3-amd64: IPv6 ProxyNDP stops responding to ND solicitation some time after startup

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Hi Kevin,

On Sun, Nov 20, 2022 at 08:23:04AM -0500, Kevin P. Fleming wrote:
> On Sun, Nov 20, 2022, at 08:15, Salvatore Bonaccorso wrote:
> > Hi,
> >
> > On Sun, Nov 20, 2022 at 02:13:11PM +0100, Salvatore Bonaccorso wrote:
> >> Control: tags -1 + moreinfo
> >> 
> >> Hi,
> >> 
> >> On Mon, Nov 14, 2022 at 06:34:43AM -0500, Kevin P. Fleming wrote:
> >> > Package: src:linux
> >> > Version: 6.0.7-1
> >> > Severity: normal
> >> > Tags: ipv6
> >> > 
> >> > Dear Maintainer,
> >> > 
> >> > This system has been operating for most of the last 12 months, using
> >> > ProxyNDP on its external interface for eight addresses. After
> >> > upgrading to the 6.0 kernel series, the kernel stops responding to ND
> >> > solicitations for those addresses after startup... it does not happen
> >> > immediately, but reliably occurs. When the system is in this state
> >> > (not responding to ND solicitations for the proxy addresses), the
> >> > proxy addresses are still shown in 'ip neigh show proxy', and the
> >> > single non-proxy address on the same interface continues operating
> >> > normally.
> >> > 
> >> > Booting the system with the 5.19.0-2 kernel package cures the problem,
> >> > with no other changes.
> >> > 
> >> > Example output:
> >> > 
> >> > root@net22:~# ip neigh show proxy
> >> > 2607:5300:203:9743::1 dev ve-diw20 proxy 
> >> > 2607:5300:203:9743::1 dev ve-matrix20 proxy 
> >> > 2607:5300:203:9743::1 dev ve-ns3 proxy 
> >> > 2607:5300:203:9743::1 dev ve-ldl20 proxy 
> >> > 2607:5300:203:9743::1 dev ve-quassel21 proxy 
> >> > 2607:5300:203:9743::1 dev ve-mastodon22 proxy 
> >> > 2607:5300:203:9743::1 dev ve-monica21 proxy 
> >> > 2607:5300:203:9743::1 dev ve-mail20 proxy 
> >> > 2607:5300:203:9743:4::1 dev enp1s0f0 proxy 
> >> > 2607:5300:203:9743:1::1 dev enp1s0f0 proxy 
> >> > 2607:5300:203:9743:8::1 dev enp1s0f0 proxy 
> >> > 2607:5300:203:9743:5::1 dev enp1s0f0 proxy 
> >> > 2607:5300:203:9743:3::1 dev enp1s0f0 proxy 
> >> > 2607:5300:203:9743:2::1 dev enp1s0f0 proxy 
> >> > 2607:5300:203:9743:6::1 dev enp1s0f0 proxy 
> >> > 2607:5300:203:9743:7::1 dev enp1s0f0 proxy 
> >> > 
> >> > The addresses on enp1s0f0 are the ones which stop responding.
> >> 
> >> Does the following matches your problem?
> >> 
> >> https://lore.kernel.org/netdev/Y295+9+JDjqRWbwU@x1.ze-it.at/
> >> 
> >> Would you be able to test the mentioned patch to verify a fix for your
> >> issue? The above changes fixes 0ff4eb3d5ebb ("neighbour: make
> >> proxy_queue.qlen limit per-device") introduced in 6.0-rc2.
> >
> > For reference, the commit would be v2 as applied in netdev as
> > https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=8207f253a097fe15c93d85ac15ebb73c5e39e1e1
> 
> While that description does not exactly match my problem, it is so
> similar as to almost certainly be the cause. I would be happy to try
> applying that patch, but it's been a while since I built a patched
> Debian kernel so it may take a couple of days :-)

If that would be helpful, we have some instructions on "simple
patching and building" the kernel with a additional patches on top
here:

https://kernel-team.pages.debian.net/kernel-handbook/ch-common-tasks.html#s4.2.2

Hope this helps for it.

Regards,
Salvatore

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Bug#1024070: linux-image-6.0.0-3-amd64: IPv6 ProxyNDP stops responding to ND solicitation some time after startup "Kevin P. Fleming" <debian@kevin.km6g.us> - 2022-11-14 12:40 +0100
  Bug#1024070: linux-image-6.0.0-3-amd64: IPv6 ProxyNDP stops responding to ND solicitation some time after startup Thomas van Gulick <thomas@van.gulick.nl> - 2022-11-19 17:00 +0100
  Processed: Re: Bug#1024070: linux-image-6.0.0-3-amd64: IPv6  ProxyNDP stops responding to ND solicitation some time after startup "Debian Bug Tracking System" <owner@bugs.debian.org> - 2022-11-20 14:20 +0100
  Bug#1024070: linux-image-6.0.0-3-amd64: IPv6 ProxyNDP stops responding to ND solicitation some time after startup Salvatore Bonaccorso <carnil@debian.org> - 2022-11-20 14:20 +0100
    Bug#1024070: linux-image-6.0.0-3-amd64: IPv6 ProxyNDP stops responding to ND solicitation some time after startup Salvatore Bonaccorso <carnil@debian.org> - 2022-11-20 14:20 +0100
  Bug#1024070: linux-image-6.0.0-3-amd64: IPv6 ProxyNDP stops responding to ND solicitation some time after startup Salvatore Bonaccorso <carnil@debian.org> - 2022-11-20 14:50 +0100
  Bug#1024070: linux-image-6.0.0-3-amd64: IPv6 ProxyNDP stops responding to ND solicitation some time after startup Salvatore Bonaccorso <carnil@debian.org> - 2022-11-24 07:50 +0100

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