Re: [PATCH net] tcp: tcp_metrics: use the socket netns, not the dst device netns

[patchwork-bot+netdevbpf@kernel.org]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Fri, 16 Oct 2026 10:48:02 +0200 you wrote:
> tcp_get_metrics(), __tcp_get_metrics_req() and tcpm_new() look up and
> create metrics entries in the netns of the cached dst device rather than
> in the netns of the socket.
> 
> These usually match, but not after the device has been moved to another
> netns or unregistered: a socket can keep a stale dst in sk_dst_cache
> until it is checked again, and tcp_update_metrics() reads it with
> __sk_dst_get() without any dst_check(). Once dst_dev_put() has run, the
> dst device is blackhole_netdev and the entry is created in init_net.
> Before that, for instance for routes through nexthop objects whose
> cached dsts are released from a nested RCU callback, it is the netns the
> device has just been moved to.
> 
> [...]

Here is the summary with links:
  - [net] tcp: tcp_metrics: use the socket netns, not the dst device netns
    https://git.kernel.org/netdev/net/c/504bdcb8c156

You are awesome, thank you!
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