Re: [RFC net v4 0/4] bnxt_en: Make RING FREE more robust

On Tue, Oct 06, 2026 at 04:43:42PM +0000, anmory wrote:

Hi Joe,

we appear to be hitting a very similar issue to the one described in
this RFC on two Broadcom BCM57504 systems.

One detail that may be particularly relevant is the ordering in our
reproductions: on both systems the AMD-Vi IO_PAGE_FAULT occurs before
the NETDEV WATCHDOG / TX timeout.

We originally encountered the problem after updating from Debian
6.12.107-1 to 6.12.111-1.

BTW there was recently this patch [1] proposed by Eric which helps prevent
a bug Stefan reported [2].

I am not sure whether the bug you are hitting is Eric's bug or the bug I am
chasing.

Other than explaining how you repro'd the issue, if you want to test Eric's
patch you could apply his patch to v6.12.111 and see if the issue still
occurs.

If it stops, it's probably the bug Eric fixed and not the one I'm chasing :)
but if it continues, it could be what I've been looking for and I'd really
want to know how you reproduced it, please.

[1]: https://lore.kernel.org/netdev/20261006042153.199444-1-edumazet@kernel.org/ (local)
[2]: https://lore.kernel.org/netdev/20261004122616.56714cbd@nargothrond/ (local)