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

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Message-ID: <c239ee1b-f201-4e7b-80f8-03a7fb02b666@ghiti.fr>
Date: Wed, 4 Jun 2025 14:44:54 +0200
From: Alexandre Ghiti <alex@...ti.fr>
To: Marco Bonelli <marco@...eim.net>,
 "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

Hi Marco,

On 5/31/25 13:52, Marco Bonelli wrote:
>> Steps to reproduce:
>>
>>      export ARCH=riscv CROSS_COMPILE=riscv32-linux-
>>      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
>>      make olddefconfig
>>      make -j vmlinux
> Sorry, forgot to add "-e FTRACE" to the steps above. Here it is:
>
> 	export ARCH=riscv CROSS_COMPILE=riscv32-linux-
> 	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
> 	make -j vmlinux
>
> Everything else still applies.
>
> --
> Marco Bonelli
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

First, thanks for the report!

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.

Can you attach your full config?

Thanks,

Alex

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