Fw: [Bug 220649] New: A bug is happening at __dev_change_net_namespace when runnning LXC/Incus service in 6.17

Fw: [Bug 220649] New: A bug is happening at __dev_change_net_namespace when runnning LXC/Incus service in 6.17

[Stephen Hemminger]

Begin forwarded message:

Date: Thu, 09 Oct 2025 13:08:57 +0000
From: bugzilla-daemon@kernel.org
To: stephen@networkplumber.org
Subject: [Bug 220649] New: A bug is happening at __dev_change_net_namespace when runnning LXC/Incus service in 6.17


https://bugzilla.kernel.org/show_bug.cgi?id=220649

            Bug ID: 220649
           Summary: A bug is happening at __dev_change_net_namespace when
                    runnning LXC/Incus service in 6.17
           Product: Networking
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Other
          Assignee: stephen@networkplumber.org
          Reporter: kosmx.mc@gmail.com
        Regression: No

Created attachment 308780
  --> https://bugzilla.kernel.org/attachment.cgi?id=308780&action=edit  
Archive containing the dmesg slice with stack trace, and the git bisect log

Log from kernel dmesg is attached. 

Steps to Reproduce in a Libvirt/QEMU VM:
1) Install ArchLinux (all dependencies are available). I recommend using
archinstall, but anything can go
2) Install LXC/Incus (pacman -S incus)
3) configure incus for running: usermod -v 1000000-1000999999 -w
1000000-1000999999 root &&
incus admin init &&
incus launch images:debian/12 first
4) Previous step should trigger incus to do namespaces. I'm not sure what
syscall is causing the bug, so I do not have a mini C program. This should be
enough to see the log in the dmesg. (it can be done on any OS, VM is not
needed, but it was easier for me)


I also did a git bisect on the kernel, the first commit to have the bug is
0c17270f9b920e4e1777488f1911bbfdaf2af3be

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Re: [Bug 220649] New: A bug is happening at __dev_change_net_namespace when runnning LXC/Incus service in 6.17

[Jakub Kicinski]

On Wed, 15 Oct 2025 15:02:38 -0700 Stephen Hemminger wrote:
> Begin forwarded message:
> 
> Date: Thu, 09 Oct 2025 13:08:57 +0000
> From: bugzilla-daemon@kernel.org
> To: stephen@networkplumber.org
> Subject: [Bug 220649] New: A bug is happening at __dev_change_net_namespace when runnning LXC/Incus service in 6.17
> 
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=220649
> 
>             Bug ID: 220649
>            Summary: A bug is happening at __dev_change_net_namespace when
>                     runnning LXC/Incus service in 6.17
>            Product: Networking
>            Version: 2.5
>           Hardware: All
>                 OS: Linux
>             Status: NEW
>           Severity: normal
>           Priority: P3
>          Component: Other
>           Assignee: stephen@networkplumber.org
>           Reporter: kosmx.mc@gmail.com
>         Regression: No
> 
> Created attachment 308780
>   --> https://bugzilla.kernel.org/attachment.cgi?id=308780&action=edit    
> Archive containing the dmesg slice with stack trace, and the git bisect log

To avoid splintering discussion - this duplicates:

https://lore.kernel.org/all/01070199e22de7f8-28f711ab-d3f1-46d9-b9a0-048ab05eb09b-000000@eu-central-1.amazonses.com/