linux-kernel - Re: Linux 6.11-rc1

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Message-ID: <20240730193841.GS33588@noisy.programming.kicks-ass.net>
Date: Tue, 30 Jul 2024 21:38:41 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Jens Axboe <axboe@...nel.dk>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Peter Anvin <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: Linux 6.11-rc1

On Tue, Jul 30, 2024 at 01:31:18PM -0600, Jens Axboe wrote:
> On 7/30/24 1:22 PM, Peter Zijlstra wrote:
> > On Tue, Jul 30, 2024 at 11:53:31AM -0700, Linus Torvalds wrote:
> > 
> >> Which makes me think it's asm_exc_int3 just recursively failing.
> > 
> > Sounds like text_poke() going sideways, there's a jump_label fail out
> > there:
> > 
> >  https://lkml.kernel.org/r/20240730132626.GV26599@noisy.programming.kicks-ass.net
> 
> No change with this applied...
> 
> Also not sure if you read my link, but a few things to note:
> 
> - It only happens with gcc-11 here. I tried 12/13/14 and those
>   are fine, don't have anything older

One of my test boxes has 4.4 4.6 4.8 4.9 5 6 8 9 10 11 12 13

(now I gotta go figure out wth 7 went :-) And yeah, we don't support
most of those version anymore (phew).

So if its easy to setup, I could try older GCCs.

> - It only happens with KFENCE enabled.

I missed the KFENCE bit. Happen to have the .config handy, I couldn't
make much sense of Gunther's website in a hurry.