From 431151b64af6c8ebec85ee1db3597b56a613f526 Mon Sep 17 00:00:00 2001
From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Date: Thu, 6 Aug 2020 23:17:41 -0700
Subject: [PATCH] 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: 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 | 36 +++++++++++++++++++++++++++++++++---
1 file changed, 33 insertions(+), 3 deletions(-)
diff --git a/scripts/decode_stacktrace.sh b/scripts/decode_stacktrace.sh
index 62a70ede7f3e8..e31e253fe5bd6 100755
--- a/scripts/decode_stacktrace.sh
+++ b/scripts/decode_stacktrace.sh
@@ -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
--
GitLab