On Mon, Jun 8, 2026 at 12:57 PM Jamal Hadi Salim [off-list ref] wrote:

I believe this bug slipped in during a small window but was fixed very
quickly. Probably some fix never trickled to stable.

Yeah, as I mentioned above, I think commit a005fa5d7502 ("net/sched:
act_mirred: Fix blockcast recursion bypass leading to stack overflow")
is missing (at least).

I would suggest reviewing the entire chain to see what needs to be backported.

If you can point me to the exact tree where this happens i can take a look.

This is the 6.12.y -rc tree:

  git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
linux-6.12.y

The stable kernel team puts the link to the repository at the top of
the thread too:

  https://lore.kernel.org/stable/20260607095727.647295505@linuxfoundation.org/ (local)

Still curious: So only the arm compiler catches this?

It likely gets caught by other arches too, i.e. I just happened to
catch it in my arm64 build.

This is Clang, not GCC, by the way.

I hope this helps!

Cheers,
Miguel