[patch 010/163] scripts/decode_stacktrace.sh: skip missing symbols

Andrew Morton
2020-08-07T06:17:38Z

From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Subject: scripts/decode_stacktrace.sh: skip missing symbols

For now script turns missing symbols into '0' and make bogus decode. Skip
them instead. Also simplify parsing output of 'nm'.

Before:

$ echo 'xxx+0x0/0x0' | ./scripts/decode_stacktrace.sh vmlinux ""
xxx (home/khlebnikov/src/linux/./arch/x86/include/asm/processor.h:398)

After:

$ echo 'xxx+0x0/0x0' | ./scripts/decode_stacktrace.sh vmlinux ""
xxx+0x0/0x0

Link: http://lkml.kernel.org/r/159282922499.248444.4883465570858385250.stgit@buzz
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

scripts/decode_stacktrace.sh | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

--- a/scripts/decode_stacktrace.sh~scripts-decode_stacktrace-skip-missing-symbols
+++ a/scripts/decode_stacktrace.sh
@@ -56,7 +56,11 @@ parse_symbol() {
if [[ "${cache[$module,$name]+isset}" == "isset" ]]; then
local base_addr=${cache[$module,$name]}
else
- local base_addr=$(nm "$objfile" | grep -i ' t ' | awk "/ $name\$/ {print \$1}" | head -n1)
+ local base_addr=$(nm "$objfile" | awk '$3 == "'$name'" && ($2 == "t" || $2 == "T") {print $1; exit}')
+ if [[ $base_addr == "" ]] ; then
+ # address not found
+ return
+ fi
cache[$module,$name]="$base_addr"
fi
# Let's start doing the math to get the exact address into the
_