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: decode_stacktrace.sh

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# (c) 2014, Sasha Levin <sasha.levin@oracle.com>
#set -x

if [[ $# < 2 ]]; then
	echo "Usage:"
	echo "	$0 [vmlinux] [base path] [modules path]"
	exit 1
fi

vmlinux=$1
basepath=$2
modpath=$3
declare -A cache
declare -A modcache

parse_symbol() {
	# The structure of symbol at this point is:
	#   ([name]+[offset]/[total length])
	#
	# For example:
	#   do_basic_setup+0x9c/0xbf

if [[ $module == "" ]] ; then
		local objfile=$vmlinux
	elif [[ "${modcache[$module]+isset}" == "isset" ]]; then
		local objfile=${modcache[$module]}
	else
		[[ $modpath == "" ]] && return
		local objfile=$(find "$modpath" -name $module.ko -print -quit)
		[[ $objfile == "" ]] && return
		modcache[$module]=$objfile
	fi

# Remove the englobing parenthesis
	symbol=${symbol#$}
	symbol=${symbol%$}

# Strip the symbol name so that we could look it up
	local name=${symbol%+*}

# Use 'nm vmlinux' to figure out the base address of said symbol.
	# It's actually faster to call it every time than to load it
	# all into bash.
	if [[ "${cache[$module,$name]+isset}" == "isset" ]]; then
		local base_addr=${cache[$module,$name]}
	else
		local base_addr=$(nm "$objfile" | grep -i ' t ' | awk "/ $name\$/ {print \$1}" | head -n1)
		cache[$module,$name]="$base_addr"
	fi
	# Let's start doing the math to get the exact address into the
	# symbol. First, strip out the symbol total length.
	local expr=${symbol%/*}

# Now, replace the symbol name with the base address we found
	# before.
	expr=${expr/$name/0x$base_addr}

# Evaluate it to find the actual address
	expr=$((expr))
	local address=$(printf "%x\n" "$expr")

# Pass it to addr2line to get filename and line number
	# Could get more than one result
	if [[ "${cache[$module,$address]+isset}" == "isset" ]]; then
		local code=${cache[$module,$address]}
	else
		local code=$(addr2line -i -e "$objfile" "$address")
		cache[$module,$address]=$code
	fi

# addr2line doesn't return a proper error code if it fails, so
	# we detect it using the value it prints so that we could preserve
	# the offset/size into the function and bail out
	if [[ $code == "??:0" ]]; then
		return
	fi

# Strip out the base of the path
	code=${code//$basepath/""}

# In the case of inlines, move everything to same line
	code=${code//$'\n'/' '}

# Replace old address with pretty line numbers
	symbol="$name ($code)"
}

decode_code() {
	local scripts=`dirname "${BASH_SOURCE[0]}"`

echo "$1" | $scripts/decodecode
}

handle_line() {
	local words

# Tokenize
	read -a words <<<"$1"

# Remove hex numbers. Do it ourselves until it happens in the
	# kernel

# We need to know the index of the last element before we
	# remove elements because arrays are sparse
	local last=$(( ${#words[@]} - 1 ))

for i in "${!words[@]}"; do
		# Remove the address
		if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then
			unset words[$i]
		fi

# Format timestamps with tabs
		if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then
			unset words[$i]
			words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}")
		fi
	done

if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
		module=${words[$last]}
		module=${module#\[}
		module=${module%\]}
		symbol=${words[$last-1]}
		unset words[$last-1]
	else
		# The symbol is the last element, process it
		symbol=${words[$last]}
		module=
	fi

unset words[$last]
	parse_symbol # modifies $symbol

# Add up the line number to the symbol
	echo "${words[@]}" "$symbol $module"
}

while read line; do
	# Let's see if we have an address in the line
	if [[ $line =~ \[\<([^]]+)\>\] ]] ||
	   [[ $line =~ [^+\ ]+\+0x[0-9a-f]+/0x[0-9a-f]+ ]]; then
		# Translate address to line numbers
		handle_line "$line"
	# Is it a code line?
	elif [[ $line == *Code:* ]]; then
		decode_code "$line"
	else
		# Nothing special in this line, show it as is
		echo "$line"
	fi
done

NAME	TYPE	LAST MODIFIED	SIZE	OWNER / GROUP	PERMISSIONS	ACTION
..
Kbuild.include	f!le	2026-09-17 8:29	15.11 KB	root / root	-rw-r--r--
Kconfig.include	f!le	2026-09-17 8:29	1.15 KB	root / root	-rw-r--r--
Lindent	f!le	2026-09-17 8:29	502 B	root / root	-rwxr-xr-x
Makefile	f!le	2026-09-17 8:29	1.7 KB	root / root	-rw-r--r--
Makefile.asm-generic	f!le	2026-09-17 8:29	1.17 KB	root / root	-rw-r--r--
Makefile.build	f!le	2026-09-17 8:29	19.25 KB	root / root	-rw-r--r--
Makefile.clean	f!le	2026-09-17 8:29	2.82 KB	root / root	-rw-r--r--
Makefile.dtbinst	f!le	2026-09-17 8:29	1.09 KB	root / root	-rw-r--r--
Makefile.extrawarn	f!le	2026-09-17 8:29	2.71 KB	root / root	-rw-r--r--
Makefile.gcc-plugins	f!le	2026-09-17 8:29	1.82 KB	root / root	-rw-r--r--
Makefile.headersinst	f!le	2026-09-17 8:29	3.98 KB	root / root	-rw-r--r--
Makefile.host	f!le	2026-09-17 8:29	6.37 KB	root / root	-rw-r--r--
Makefile.kasan	f!le	2026-09-17 8:29	1.64 KB	root / root	-rw-r--r--
Makefile.kcov	f!le	2026-09-17 8:29	319 B	root / root	-rw-r--r--
Makefile.kcsan	f!le	2026-09-17 8:29	118 B	root / root	-rw-r--r--
Makefile.lib	f!le	2026-09-17 8:29	15.17 KB	root / root	-rw-r--r--
Makefile.modbuiltin	f!le	2026-09-17 8:29	1.68 KB	root / root	-rw-r--r--
Makefile.modinst	f!le	2026-09-17 8:29	1.12 KB	root / root	-rw-r--r--
Makefile.modpost	f!le	2026-09-17 8:29	5.3 KB	root / root	-rw-r--r--
Makefile.modsign	f!le	2026-09-17 8:29	897 B	root / root	-rw-r--r--
Makefile.ubsan	f!le	2026-09-17 8:29	951 B	root / root	-rw-r--r--
adjust_autoksyms.sh	f!le	2026-09-17 8:29	2.94 KB	root / root	-rwxr-xr-x
asn1_compiler	f!le	2025-08-11 11:35	27.35 KB	root / root	-rwxr-xr-x
asn1_compiler.c	f!le	2026-09-17 8:29	35.54 KB	root / root	-rw-r--r--
bin2c	f!le	2025-08-11 11:35	6.86 KB	root / root	-rwxr-xr-x
bin2c.c	f!le	2026-09-17 8:29	743 B	root / root	-rw-r--r--
bloat-o-meter	f!le	2026-09-17 8:29	3.24 KB	root / root	-rwxr-xr-x
bootgraph.pl	f!le	2026-09-17 8:29	6.28 KB	root / root	-rwxr-xr-x
bpf_doc.py	f!le	2026-09-17 8:29	24.92 KB	root / root	-rwxr-xr-x
cc-can-link.sh	f!le	2026-09-17 8:29	166 B	root / root	-rwxr-xr-x
check_00index.sh	f!le	2026-09-17 8:29	1.3 KB	root / root	-rwxr-xr-x
check_extable.sh	f!le	2026-09-17 8:29	4.93 KB	root / root	-rwxr-xr-x
checkincludes.pl	f!le	2026-09-17 8:29	1.94 KB	root / root	-rwxr-xr-x
checkkconfigsymbols.py	f!le	2026-09-17 8:29	15.52 KB	root / root	-rwxr-xr-x
checkpatch.pl	f!le	2026-09-17 8:29	192.56 KB	root / root	-rwxr-xr-x
checkstack.pl	f!le	2026-09-17 8:29	5.18 KB	root / root	-rwxr-xr-x
checksyscalls.sh	f!le	2026-09-17 8:29	6.93 KB	root / root	-rwxr-xr-x
checkversion.pl	f!le	2026-09-17 8:29	1.89 KB	root / root	-rwxr-xr-x
clang-version.sh	f!le	2026-09-17 8:29	635 B	root / root	-rwxr-xr-x
cleanfile	f!le	2026-09-17 8:29	3.46 KB	root / root	-rwxr-xr-x
cleanpatch	f!le	2026-09-17 8:29	5.06 KB	root / root	-rwxr-xr-x
coccicheck	f!le	2026-09-17 8:29	7.23 KB	root / root	-rwxr-xr-x
config	f!le	2026-09-17 8:29	4.53 KB	root / root	-rwxr-xr-x
conmakehash	f!le	2025-08-11 11:35	11.34 KB	root / root	-rwxr-xr-x
conmakehash.c	f!le	2026-09-17 8:29	5.98 KB	root / root	-rw-r--r--
const_structs.checkpatch	f!le	2026-09-17 8:29	964 B	root / root	-rw-r--r--
decode_stacktrace.sh	f!le	2026-09-17 8:29	3.74 KB	root / root	-rwxr-xr-x
decodecode	f!le	2026-09-17 8:29	2.47 KB	root / root	-rwxr-xr-x
depmod.sh	f!le	2026-09-17 8:29	1.09 KB	root / root	-rwxr-xr-x
diffconfig	f!le	2026-09-17 8:29	3.73 KB	root / root	-rwxr-xr-x
documentation-file-ref-ch...-.	f!le	2026-09-17 8:29	3.46 KB	root / root	-rwxr-xr-x
export_report.pl	f!le	2026-09-17 8:29	4.54 KB	root / root	-rwxr-xr-x
extract-cert	f!le	2025-08-11 11:35	11.34 KB	root / root	-rwxr-xr-x
extract-cert.c	f!le	2026-09-17 8:29	3.46 KB	root / root	-rw-r--r--
extract-ikconfig	f!le	2026-09-17 8:29	1.69 KB	root / root	-rwxr-xr-x
extract-module-sig.pl	f!le	2026-09-17 8:29	3.65 KB	root / root	-rwxr-xr-x
extract-sys-certs.pl	f!le	2026-09-17 8:29	3.74 KB	root / root	-rwxr-xr-x
extract-vmlinux	f!le	2026-09-17 8:29	1.68 KB	root / root	-rwxr-xr-x
extract_xc3028.pl	f!le	2026-09-17 8:29	44.59 KB	root / root	-rwxr-xr-x
faddr2line	f!le	2026-09-17 8:29	6.16 KB	root / root	-rwxr-xr-x
file-size.sh	f!le	2026-09-17 8:29	86 B	root / root	-rwxr-xr-x
find-unused-docs.sh	f!le	2026-09-17 8:29	1.28 KB	root / root	-rwxr-xr-x
gcc-goto.sh	f!le	2026-09-17 8:29	530 B	root / root	-rwxr-xr-x
gcc-ld	f!le	2026-09-17 8:29	711 B	root / root	-rwxr-xr-x
gcc-plugin.sh	f!le	2026-09-17 8:29	1.06 KB	root / root	-rwxr-xr-x
gcc-version.sh	f!le	2026-09-17 8:29	857 B	root / root	-rwxr-xr-x
gcc-x86_32-has-stack-prot...-.	f!le	2026-09-17 8:29	173 B	root / root	-rwxr-xr-x
gcc-x86_64-has-stack-prot...-.	f!le	2026-09-17 8:29	198 B	root / root	-rwxr-xr-x
gen_initramfs_list.sh	f!le	2026-09-17 8:29	8.03 KB	root / root	-rwxr-xr-x
get_dvb_firmware	f!le	2026-09-17 8:29	25.22 KB	root / root	-rwxr-xr-x
get_maintainer.pl	f!le	2026-09-17 8:29	65.79 KB	root / root	-rwxr-xr-x
gfp-translate	f!le	2026-09-17 8:29	1.71 KB	root / root	-rwxr-xr-x
headerdep.pl	f!le	2026-09-17 8:29	3.5 KB	root / root	-rwxr-xr-x
headers.sh	f!le	2026-09-17 8:29	512 B	root / root	-rwxr-xr-x
headers_check.pl	f!le	2026-09-17 8:29	3.73 KB	root / root	-rwxr-xr-x
headers_install.sh	f!le	2026-09-17 8:29	1.36 KB	root / root	-rwxr-xr-x
insert-sys-cert.c	f!le	2026-09-17 8:29	8.87 KB	root / root	-rw-r--r--
kallsyms	f!le	2025-08-11 11:35	19.52 KB	root / root	-rwxr-xr-x
kallsyms.c	f!le	2026-09-17 8:29	18.14 KB	root / root	-rw-r--r--
kernel-doc	f!le	2026-09-17 8:29	61.09 KB	root / root	-rwxr-xr-x
ld-version.sh	f!le	2026-09-17 8:29	269 B	root / root	-rwxr-xr-x
leaking_addresses.pl	f!le	2026-09-17 8:29	12.85 KB	root / root	-rwxr-xr-x
link-vmlinux.sh	f!le	2026-09-17 8:29	8.96 KB	root / root	-rwxr-xr-x
makelst	f!le	2026-09-17 8:29	808 B	root / root	-rwxr-xr-x
markup_oops.pl	f!le	2026-09-17 8:29	8.08 KB	root / root	-rwxr-xr-x
mkcompile_h	f!le	2026-09-17 8:29	2.57 KB	root / root	-rwxr-xr-x
mkmakefile	f!le	2026-09-17 8:29	1.19 KB	root / root	-rwxr-xr-x
mksysmap	f!le	2026-09-17 8:29	1.33 KB	root / root	-rwxr-xr-x
mkuboot.sh	f!le	2026-09-17 8:29	414 B	root / root	-rwxr-xr-x
module-common.lds	f!le	2026-09-17 8:29	901 B	root / root	-rw-r--r--
modules.order	f!le	2025-08-11 11:29	0 B	root / root	-rw-r--r--
namespace.pl	f!le	2026-09-17 8:29	13.04 KB	root / root	-rwxr-xr-x
objdiff	f!le	2026-09-17 8:29	2.85 KB	root / root	-rwxr-xr-x
parse-maintainers.pl	f!le	2026-09-17 8:29	4.54 KB	root / root	-rwxr-xr-x
patch-kernel	f!le	2026-09-17 8:29	9.95 KB	root / root	-rwxr-xr-x
pnmtologo	f!le	2025-08-11 11:35	15.35 KB	root / root	-rwxr-xr-x
pnmtologo.c	f!le	2026-09-17 8:29	11.91 KB	root / root	-rw-r--r--
profile2linkerlist.pl	f!le	2026-09-17 8:29	410 B	root / root	-rwxr-xr-x
prune-kernel	f!le	2026-09-17 8:29	708 B	root / root	-rwxr-xr-x
recordmcount	f!le	2025-08-11 11:35	23.45 KB	root / root	-rwxr-xr-x
recordmcount.c	f!le	2026-09-17 8:29	16.66 KB	root / root	-rw-r--r--
recordmcount.h	f!le	2026-09-17 8:29	16.38 KB	root / root	-rw-r--r--
recordmcount.pl	f!le	2026-09-17 8:29	18.27 KB	root / root	-rwxr-xr-x
setlocalversion	f!le	2026-09-17 8:29	3.92 KB	root / root	-rwxr-xr-x
show_delta	f!le	2026-09-17 8:29	3 KB	root / root	-rwxr-xr-x
sign-file	f!le	2025-08-11 11:35	15.4 KB	root / root	-rwxr-xr-x
sign-file.c	f!le	2026-09-17 8:29	9.76 KB	root / root	-rw-r--r--
sortextable	f!le	2025-08-11 11:35	15.34 KB	root / root	-rwxr-xr-x
sortextable.c	f!le	2026-09-17 8:29	10.17 KB	root / root	-rw-r--r--
sortextable.h	f!le	2026-09-17 8:29	5.48 KB	root / root	-rw-r--r--
spelling.txt	f!le	2026-09-17 8:29	25.01 KB	root / root	-rw-r--r--
sphinx-pre-install	f!le	2026-09-17 8:29	14.04 KB	root / root	-rwxr-xr-x
split-man.pl	f!le	2026-09-17 8:29	600 B	root / root	-rwxr-xr-x
stackdelta	f!le	2026-09-17 8:29	1.84 KB	root / root	-rwxr-xr-x
stackusage	f!le	2026-09-17 8:29	794 B	root / root	-rwxr-xr-x
subarch.include	f!le	2026-09-17 8:29	641 B	root / root	-rw-r--r--
tags.sh	f!le	2026-09-17 8:29	9.56 KB	root / root	-rwxr-xr-x
test_fortify.sh	f!le	2026-09-17 8:29	2.23 KB	root / root	-rw-r--r--
unifdef	f!le	2025-08-11 11:35	35.34 KB	root / root	-rwxr-xr-x
unifdef.c	f!le	2026-09-17 8:29	34.8 KB	root / root	-rw-r--r--
ver_linux	f!le	2026-09-17 8:29	2.68 KB	root / root	-rwxr-xr-x
xen-hypercalls.sh	f!le	2026-09-17 8:29	386 B	root / root	-rw-r--r--
xz_wrap.sh	f!le	2026-09-17 8:29	562 B	root / root	-rwxr-xr-x