linux-kernel - Re: Broken 32-bit riscv debug build with ZSTD and FTRACE

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Message-ID: <1338988468.1011577.1749045125350@privateemail.com>
Date: Wed, 4 Jun 2025 15:52:05 +0200 (CEST)
From: Marco Bonelli <marco@...eim.net>
To: Alexandre Ghiti <alex@...ti.fr>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc: "terrelln@...com" <terrelln@...com>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"mhiramat@...nel.org" <mhiramat@...nel.org>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"linux-trace-kernel@...r.kernel.org" <linux-trace-kernel@...r.kernel.org>,
	"paul.walmsley@...ive.com" <paul.walmsley@...ive.com>,
	"palmer@...belt.com" <palmer@...belt.com>,
	"aou@...s.berkeley.edu" <aou@...s.berkeley.edu>,
	"linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>
Subject: Re: Broken 32-bit riscv debug build with ZSTD and FTRACE

> Can you attach your full config?

Here it is: https://pastebin.com/raw/wL2Q38g0 - uploaded to pastebin to
avoid clogging everyone's inbox.

> I unfortunately cannot reproduce this issue locally, I tried on both 
> v6.15 and latest linus master, with gcc 13.1.0 and gcc 14.2.0 . I made 
> sure that I have FTRACE, ZSTD_COMPRESS and DEBUG_INFO enabled.

Are you building on a x86-64 host? Maybe something in my build environment
is relevant (not sure what it could be). I am building on x86-64 Debian 12
with host GCC 12.2.0, target cross GCC 14.2.0 [1]. 

Here is a minimal Dockerfile that reproduces the issue (docker build should
fail on the last command when it gets to MODPOST vmlinux.symvers):

	# docker build --progress=plain .
	FROM debian:12

	ENV DEBIAN_FRONTEND=noninteractive
	RUN apt-get update && \
		apt-get install -y \
			build-essential git make gcc-12 binutils util-linux bc gawk flex \
			bison dwarves tar wget

	WORKDIR /work
	RUN git clone --depth 1 --single-branch --branch v6.15 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
	RUN wget 'https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/14.2.0/x86_64-gcc-14.2.0-nolibc-riscv32-linux.tar.xz'
	RUN tar xf x86_64-gcc-14.2.0-nolibc-riscv32-linux.tar.xz

	WORKDIR /work/linux
	ENV PATH=/work/gcc-14.2.0-nolibc/riscv32-linux/bin:$PATH
	ENV CROSS_COMPILE=riscv32-linux-
	ENV ARCH=riscv
	RUN make distclean && \
		make defconfig && \
		make 32-bit.config && \
		./scripts/config \
			-e DEBUG_KERNEL \
			-e DEBUG_INFO \
			-e DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT \
			-d DEBUG_INFO_NONE \
			-d DEBUG_INFO_REDUCED \
			-e FTRACE && \
		make olddefconfig

	RUN make -j19 vmlinux

Hope this helps. Let me know if you need any additional info or test.

[1]: https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/14.2.0/x86_64-gcc-14.2.0-nolibc-riscv32-linux.tar.xz

--
Marco Bonelli