netdev - Re: stmmac on Banana PI CPU stalls since Linux 6.6

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Date: Tue, 20 Feb 2024 06:59:41 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Petr Tesařík <petr@...arici.cz>, Christian Stewart
 <christian@...rture.us>
Cc: Marc Haber <mh+netdev@...schlus.de>, Florian Fainelli
 <f.fainelli@...il.com>, Andrew Lunn <andrew@...n.ch>,
 alexandre.torgue@...s.st.com, Jose Abreu <joabreu@...opsys.com>, Chen-Yu
 Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, Samuel
 Holland <samuel@...lland.org>, Jisheng Zhang <jszhang@...nel.org>,
 netdev@...r.kernel.org
Subject: Re: stmmac on Banana PI CPU stalls since Linux 6.6

On Mon, 19 Feb 2024 20:44:21 +0100 Petr Tesařík wrote:
> If you're running a 6.7 stable kernel, my patch has just been added to
> the 6.7-stable tree.
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-6.7/net-stmmac-protect-updates-of-64-bit-statistics-counters.patch
> 
> However, lockdep has reported an issue with it:
> 
> https://lore.kernel.org/lkml/ea1567d9-ce66-45e6-8168-ac40a47d1821@roeck-us.net/
> 
> This new report has not yet been properly understood, but FWIW I've
> been running stable with my patch for over a month now.

Christian got an actual soft lockup, not just a lockdep warning, tho.
Christian, could you run the stack trace thru scripts/decode_stacktrace
and tell us which loop it's stuck on?