scripts/decode_stacktrace.sh: guess path to modules (431151b6) · Commits · 戴 / test

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:

Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by:

Andrew 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:

Linus Torvalds <torvalds@linux-foundation.org>

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

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