linux-kernel - Re: next-20250804: clang-nightly hardening.config boot failed on arm64 rock-pi-4b

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Message-ID: <20250804175338.GA2197404@ax162>
Date: Mon, 4 Aug 2025 10:53:38 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Kees Cook <kees@...nel.org>
Cc: Naresh Kamboju <naresh.kamboju@...aro.org>,
	clang-built-linux <llvm@...ts.linux.dev>,
	open list <linux-kernel@...r.kernel.org>,
	lkft-triage@...ts.linaro.org,
	Linux Regressions <regressions@...ts.linux.dev>,
	linux-hardening@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Anders Roxell <anders.roxell@...aro.org>,
	Ben Copeland <benjamin.copeland@...aro.org>
Subject: Re: next-20250804: clang-nightly hardening.config boot failed on
 arm64 rock-pi-4b

On Mon, Aug 04, 2025 at 08:44:16AM -0700, Kees Cook wrote:
> On Mon, Aug 04, 2025 at 03:41:51PM +0530, Naresh Kamboju wrote:
> > Regressions found while booting the Linux next-20250804 on the
> > qemu-arm64, dragonboard-410c, rock-pi-4b due to following kernel log.
> > 
> > Regression Analysis:
> > - New regression? Yes
> > - Reproducibility? yes
> > 
> > First seen on the next-20250804
> > Good: next-20250801
> > Bad: next-20250804
> 
> Are you able to bisect this by any chance?

I think this is the runtime manifestation of
https://github.com/ClangBuiltLinux/linux/issues/2116 when built with a
version of LLVM without assertions (when assertions are enabled, the
build just fails). I can reproduce this with a version of LLVM that
contains the broken change and it is resolved with a version of LLVM
that contains Fangrui's fixes. I assume this should hit LKFT in the next
couple of days via apt.llvm.org.

Cheers,
Nathan