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Bug#1135514: icmp: detected local route for xx during ICMP sending (6.1.170-1 / 6.1.0-45-amd64, silent on 6.1.164-1 / 6.1.0-44-amd64)

Cross-posted to 2 groups.

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Hi,

On Sat, May 02, 2026 at 08:12:42AM +0200, Salvatore Bonaccorso wrote:
> Hi,
> 
> Thanks for your report.
> 
> On Fri, May 01, 2026 at 09:24:43PM -0400, podorski wrote:
> > Source: linux
> > Version: Regression introduced in 6.1.170-1 / 6.1.0-45-amd64
> > Severity: important
> > 
> > Dear Maintainer,
> > 
> > *** Reporter, please consider answering these questions, where appropriate ***
> > 
> >    * What led up to the situation?
> > updating kernel via apt on 20260501
> > 
> > any ping from my host to a "down" host on my lan causes these messages to pile up in the ring buffer
> 
> This looks to be a consequence of/related to the backport of
> 81b84de32bb2 ("xfrm: fix ip_rt_bug race in icmp_route_lookup reverse
> path") which landed in 6.1.165 upstream and thus included as well in
> the recent bookworm-security update.
> 
> The change is net_warn_ratelimited() but it is not immediately clear
> to me yet why this triggers on a bookworm kernel, whereas it does not
> with on a trixie host with 6.12.85-1.
> 
> We will have a look.

So indeed, given this is the one emmiting the message reverting the
commit in 6.1.y "fixes" the problem. I'm going to contact upstream /
stable maintainers to see how to proceed, there might be a missing
requisite in 6.1.y causing the problem.

Regards,
Salvatore

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Bug#1135514: icmp: detected local route for xx during ICMP sending (6.1.170-1 / 6.1.0-45-amd64, silent on 6.1.164-1 / 6.1.0-44-amd64) podorski <podorski@gmail.com> - 2026-05-02 03:30 +0200
  Bug#1135514: icmp: detected local route for xx during ICMP sending (6.1.170-1 / 6.1.0-45-amd64, silent on 6.1.164-1 / 6.1.0-44-amd64) Salvatore Bonaccorso <carnil@debian.org> - 2026-05-02 08:20 +0200
    Bug#1135514: icmp: detected local route for xx during ICMP sending (6.1.170-1 / 6.1.0-45-amd64, silent on 6.1.164-1 / 6.1.0-44-amd64) Salvatore Bonaccorso <carnil@debian.org> - 2026-05-02 11:00 +0200
  Processed: [6.1.y regresssion] 9a95ec9144ee ("xfrm: fix ip_rt_bug  race in icmp_route_lookup reverse path") causes log spam on ping to  unreachable host "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-02 11:30 +0200
  Bug#1135514: [6.1.y regresssion] 9a95ec9144ee ("xfrm: fix ip_rt_bug race in icmp_route_lookup reverse path") causes log spam on ping to unreachable host Salvatore Bonaccorso <carnil@debian.org> - 2026-05-06 11:50 +0200
  Bug#1135514: [6.1.y regresssion] 9a95ec9144ee ("xfrm: fix ip_rt_bug race in icmp_route_lookup reverse path") causes log spam on ping to unreachable host Salvatore Bonaccorso <carnil@debian.org> - 2026-05-06 14:10 +0200
  Bug#1135514: marked as done (icmp: detected local route for xx  during ICMP sending (6.1.170-1 / 6.1.0-45-amd64, silent on 6.1.164-1 /  6.1.0-44-amd64)) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-10 20:40 +0200

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