From 2bff77c665edd854a09c479effe75b3b0e3fedef Mon Sep 17 00:00:00 2001
From: Luca Ceresoli <luca.ceresoli@bootlin.com>
Date: Mon, 30 Dec 2024 22:55:10 +0100
Subject: [PATCH] scripts/decode_stacktrace.sh: fix decoding of lines with an
additional info
Since commit bdf8eafbf7f5 ("arm64: stacktrace: report source of unwind
data") a stack trace line can contain an additional info field that was not
present before, in the form of one or more letters in parentheses. E.g.:
[ 504.517915] led_sysfs_enable+0x54/0x80 (P)
^^^
When this is present, decode_stacktrace decodes the line incorrectly:
[ 504.517915] led_sysfs_enable+0x54/0x80 P
Extend parsing to decode it correctly:
[ 504.517915] led_sysfs_enable (drivers/leds/led-core.c:455 (discriminator 7)) (P)
The regex to match such lines assumes the info can be extended in the
future to other uppercase characters, and will need to be extended in case
other characters will be used. Using a much more generic regex might incur
in false positives, so this looked like a good tradeoff.
Link: https://lkml.kernel.org/r/20241230-decode_stacktrace-fix-info-v1-1-984910659173@bootlin.com
Fixes: bdf8eafbf7f5 ("arm64: stacktrace: report source of unwind data")
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Miroslav Benes <mbenes@suse.cz>
Cc: Puranjay Mohan <puranjay@kernel.org>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
scripts/decode_stacktrace.sh | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/scripts/decode_stacktrace.sh b/scripts/decode_stacktrace.sh
index 46fa18b80fc1b..17abc4e7a9855 100755
--- a/scripts/decode_stacktrace.sh
+++ b/scripts/decode_stacktrace.sh
@@ -286,6 +286,18 @@ handle_line() {
last=$(( $last - 1 ))
fi
+ # Extract info after the symbol if present. E.g.:
+ # func_name+0x54/0x80 (P)
+ # ^^^
+ # The regex assumes only uppercase letters will be used. To be
+ # extended if needed.
+ local info_str=""
+ if [[ ${words[$last]} =~ \([A-Z]*\) ]]; then
+ info_str=${words[$last]}
+ unset words[$last]
+ last=$(( $last - 1 ))
+ fi
+
if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
module=${words[$last]}
# some traces format is "(%pS)", which like "(foo+0x0/0x1 [bar])"
@@ -313,9 +325,9 @@ handle_line() {
# Add up the line number to the symbol
if [[ -z ${module} ]]
then
- echo "${words[@]}" "$symbol"
+ echo "${words[@]}" "$symbol ${info_str}"
else
- echo "${words[@]}" "$symbol $module"
+ echo "${words[@]}" "$symbol $module ${info_str}"
fi
}
--
GitLab