linux-kernel - Re: [PATCH/RFT] Re: ANNOUNCE: pahole v1.27 (reproducible builds, BTF kfuncs)

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Message-ID: <20240617210810.GA1877676@thelio-3990X>
Date: Mon, 17 Jun 2024 14:08:10 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: dwarves@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	bpf@...r.kernel.org, Alan Maguire <alan.maguire@...cle.com>,
	Jiri Olsa <jolsa@...nel.org>, Jan Engelhardt <jengelh@...i.de>,
	Matthias Schwarzott <zzam@...too.org>,
	Viktor Malik <vmalik@...hat.com>,
	Eduard Zingerman <eddyz87@...il.com>,
	Jan Alexander Steffens <heftig@...hlinux.org>,
	Domenico Andreoli <cavok@...ian.org>,
	Dominique Leuenberger <dimstar@...nsuse.org>,
	Daniel Xu <dxu@...uu.xyz>, Yonghong Song <yonghong.song@...ux.dev>,
	llvm@...ts.linux.dev
Subject: Re: [PATCH/RFT] Re: ANNOUNCE: pahole v1.27 (reproducible builds, BTF
 kfuncs)

On Mon, Jun 17, 2024 at 05:02:12PM -0300, Arnaldo Carvalho de Melo wrote:
> Can you try with the one liner below? We remove it from the cus list
> unconditionally, and since we alloc space with zalloc/calloc in
> cu__new() and missed initializing that list_head (cu->node) we ended up
> hitting list_del with a zeroed 'struct list_head' :-\
> 
> I'll try and get this cast_common.ko checked into a test repo for pahole
> so that this gets regression tested.
> 
> Please test this patch so that we see if this is the only problem and
> your kernel build with clang completes successfully.

Thanks, I rebuilt pahole with the following diff and both my build and
the other configuration I tested for this regression successfully
complete.

Tested-by: Nathan Chancellor <nathan@...nel.org>

> diff --git a/dwarves.c b/dwarves.c
> index 1ec259f50dbd3778..823a01524a12bb37 100644
> --- a/dwarves.c
> +++ b/dwarves.c
> @@ -739,6 +739,7 @@ struct cu *cu__new(const char *name, uint8_t addr_size,
>  		cu->dfops	= NULL;
>  		INIT_LIST_HEAD(&cu->tags);
>  		INIT_LIST_HEAD(&cu->tool_list);
> +		INIT_LIST_HEAD(&cu->node);
>  
>  		cu->addr_size = addr_size;
>  		cu->extra_dbg_info = 0;