linux-kernel - Re: arm64: perf test 26 rpi4 oops

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Date:   Fri, 28 Jul 2023 16:23:09 +0100
From:   Will Deacon <will@...nel.org>
To:     Mike Galbraith <efault@....de>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: arm64: perf test 26 rpi4 oops

On Fri, Jul 28, 2023 at 05:12:43PM +0200, Mike Galbraith wrote:
> On Fri, 2023-07-28 at 15:18 +0100, Will Deacon wrote:
> > On Fri, Jul 28, 2023 at 06:06:33AM +0200, Mike Galbraith wrote:
> > > perf test 26 in virgin master inspired the below.
> >
> > Ah, so this is the 6.5-based panic message below?
> 
> Yeah, that was virgin master.
> 
> The oops arrived with 2e1c0170771e, _but_ it turns out to be somehow
> config related.  The obese distro config rolled forward does not oops,
> much leaner local config does, despite cute little rpi4 working just
> fine.. for everything _except_ 'perf test 26' :)

The commit mentions HARDENED_USERCOPY, so maybe that? In any case, if
you can share your broken config someplace I can try to give it a spin.

Thanks,

Will