linux-kernel - Re: [PATCH] scripts/decode_stacktrace.sh: fix build ID and PC source parsing

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Message-Id: <DDVQOOYR7YOO.3L40JABB6VVUW@bootlin.com>
Date: Thu, 30 Oct 2025 15:50:52 +0100
From: "Luca Ceresoli" <luca.ceresoli@...tlin.com>
To: "Carlos Llamas" <cmllamas@...gle.com>, "Andrew Morton"
 <akpm@...ux-foundation.org>, "Matthieu Baerts (NGI0)" <matttbe@...nel.org>,
 "Breno Leitao" <leitao@...ian.org>, "Miroslav Benes" <mbenes@...e.cz>,
 "Mark Brown" <broonie@...nel.org>, "Puranjay Mohan" <puranjay@...nel.org>,
 "Mark Rutland" <mark.rutland@....com>, "Catalin Marinas"
 <catalin.marinas@....com>
Cc: <kernel-team@...roid.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scripts/decode_stacktrace.sh: fix build ID and PC
 source parsing

Hello,

On Thu Oct 30, 2025 at 2:03 AM CET, Carlos Llamas wrote:
> Support for parsing PC source info in stacktraces (e.g. '(P)') was
> added in commit 2bff77c665ed ("scripts/decode_stacktrace.sh: fix
> decoding of lines with an additional info"). However, this logic was
> placed after the build ID processing. This incorrect order fails to
> parse lines containing both elements, e.g.:
>
>   drm_gem_mmap_obj+0x114/0x200 [drm 03d0564e0529947d67bb2008c3548be77279fd27] (P)
>
> This patch fixes the problem by extracting the PC source info first and
> then processing the module build ID. With this change, the line above is
> now properly parsed as such:
>
>   drm_gem_mmap_obj (./include/linux/mmap_lock.h:212 ./include/linux/mm.h:811 drivers/gpu/drm/drm_gem.c:1177) drm (P)
>
> While here, also add a brief explanation the build ID section.
>
> Fixes: bdf8eafbf7f5 ("arm64: stacktrace: report source of unwind data")
> Fixes: 2bff77c665ed ("scripts/decode_stacktrace.sh: fix decoding of lines with an additional info")
> Signed-off-by: Carlos Llamas <cmllamas@...gle.com>

Reviewed-by: Luca Ceresoli <luca.ceresoli@...tlin.com>

--
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com