Commit 431151b6 authored by Konstantin Khlebnikov's avatar Konstantin Khlebnikov Committed by Linus Torvalds
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scripts/decode_stacktrace.sh: guess path to modules 



Try to find module in directory with vmlinux (for fresh build).  Then try
standard paths where debuginfo are usually placed.  Pick first file which
have elf section '.debug_line'.

Before:

$ echo 'tap_open+0x0/0x0 [tap]' |
  ./scripts/decode_stacktrace.sh /usr/lib/debug/boot/vmlinux-5.4.0-37-generic
WARNING! Modules path isn't set, but is needed to parse this symbol
tap_open+0x0/0x0 tap

After:

$ echo 'tap_open+0x0/0x0 [tap]' |
  ./scripts/decode_stacktrace.sh /usr/lib/debug/boot/vmlinux-5.4.0-37-generic
tap_open (drivers/net/tap.c:502) tap

Signed-off-by: default avatarKonstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: Sasha Levin <sashal@kernel.org>
Link: http://lkml.kernel.org/r/159282923068.248444.5461337458421616083.stgit@buzz


Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ecda6e27

scripts/decode_stacktrace.sh

+33 −3
Original line number Diff line number Diff line
@@ -12,9 +12,40 @@ fi 
vmlinux=$1

basepath=${2-auto}

modpath=$3

release=""



declare -A cache

declare -A modcache



find_module() {

	if [[ "$modpath" != "" ]] ; then

		for fn in $(find "$modpath" -name "${module//_/[-_]}.ko*") ; do

			if readelf -WS "$fn" | grep -qwF .debug_line ; then

				echo $fn

				return

			fi

		done

		return 1

	fi



	modpath=$(dirname "$vmlinux")

	find_module && return



	if [[ $release == "" ]] ; then

		release=$(gdb -ex 'print init_uts_ns.name.release' -ex 'quit' -quiet -batch "$vmlinux" | sed -n 's/\$1 = "\(.*\)".*/\1/p')

	fi



	for dn in {/usr/lib/debug,}/lib/modules/$release ; do

		if [ -e "$dn" ] ; then

			modpath="$dn"

			find_module && return

		fi

	done



	modpath=""

	return 1

}



parse_symbol() {

	# The structure of symbol at this point is:

	#   ([name]+[offset]/[total length])
@@ -27,12 +58,11 @@ parse_symbol() { 
	elif [[ "${modcache[$module]+isset}" == "isset" ]]; then

		local objfile=${modcache[$module]}

	else

		if [[ $modpath == "" ]]; then

		local objfile=$(find_module)

		if [[ $objfile == "" ]] ; then

			echo "WARNING! Modules path isn't set, but is needed to parse this symbol" >&2

			return

		fi

		local objfile=$(find "$modpath" -name "${module//_/[-_]}.ko*" -print -quit)

		[[ $objfile == "" ]] && return

		modcache[$module]=$objfile

	fi