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Date: Tue, 21 Jan 2025 14:39:12 +0100
From: Ivan Kokshaysky <ink@unseen.parts>
To: "Maciej W. Rozycki" <macro@orcam.me.uk>
Cc: Magnus Lindholm <linmag7@gmail.com>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Michael Cree <mcree@orcon.net.nz>,
	John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
	rcu@vger.kernel.org, linux-alpha@vger.kernel.org
Subject: Re: Kernel Oops on alpha with kernel version >=6.9.x
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In-Reply-To: <alpine.DEB.2.21.2501201317060.27432@angie.orcam.me.uk>

On Mon, Jan 20, 2025 at 01:19:23PM +0000, Maciej W. Rozycki wrote:
> On Mon, 20 Jan 2025, Magnus Lindholm wrote:
> 
> > 8-byte aligned. A quick-fix/workaround for this might be to avoid
> > using the __attribute__((__aligned__(x))) directive on
> > variables/structs declared on the stack in the kernel code (at least
> > for alpha), but to really get to the bottom of this, the kernel needs
> > to be fixed so that the kernel stack is in fact always 16-byte aligned
> > on alpha. This means that this bug is not really related to rcu or smp
> > but rather a mismatch between gcc and linux-alpha regarding psABI
> > compliance.
> 
>  Correct.  Unless someone beats me to it, I'll work on a fix, but I'm busy
> with other stuff right now, so it may take a few weeks.

I'll look into that (I owe you for helping me with the binutils patch :)

Indeed, SP_OFF in entry.S is the main suspect at the moment.

Ivan.