The patch titled
Subject: scripts/decode_stacktrace.sh: optionally use LLVM utilities
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
scripts-decode_stacktracesh-optionally-use-llvm-utilities.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/scripts-decode_stacktracesh-optionally-use-llvm-utilities.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Carlos Llamas <cmllamas@xxxxxxxxxx>
Subject: scripts/decode_stacktrace.sh: optionally use LLVM utilities
Date: Fri, 29 Sep 2023 03:48:17 +0000
GNU's addr2line can have problems parsing a vmlinux built with LLVM,
particularly when LTO was used. In order to decode the traces correctly
this patch adds the ability to switch to LLVM's utilities readelf and
addr2line. The same approach is followed by Will in [1].
Before:
$ scripts/decode_stacktrace.sh vmlinux < kernel.log
[17716.240635] Call trace:
[17716.240646] skb_cow_data (??:?)
[17716.240654] esp6_input (ld-temp.o:?)
[17716.240666] xfrm_input (ld-temp.o:?)
[17716.240674] xfrm6_rcv (??:?)
[...]
After:
$ LLVM=1 scripts/decode_stacktrace.sh vmlinux < kernel.log
[17716.240635] Call trace:
[17716.240646] skb_cow_data (include/linux/skbuff.h:2172 net/core/skbuff.c:4503)
[17716.240654] esp6_input (net/ipv6/esp6.c:977)
[17716.240666] xfrm_input (net/xfrm/xfrm_input.c:659)
[17716.240674] xfrm6_rcv (net/ipv6/xfrm6_input.c:172)
[...]
Note that one could set CROSS_COMPILE=llvm- instead to hack around this
issue. However, doing so can break the decodecode routine as it will
force the selection of other LLVM utilities down the line e.g. llvm-as.
[1] https://lore.kernel.org/all/20230914131225.13415-3-will@xxxxxxxxxx/
Link: https://lkml.kernel.org/r/20230929034836.403735-1-cmllamas@xxxxxxxxxx
Signed-off-by: Carlos Llamas <cmllamas@xxxxxxxxxx>
Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Reviewed-by: Elliot Berman <quic_eberman@xxxxxxxxxxx>
Tested-by: Justin Stitt <justinstitt@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: John Stultz <jstultz@xxxxxxxxxx>
Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Tom Rix <trix@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/decode_stacktrace.sh | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
--- a/scripts/decode_stacktrace.sh~scripts-decode_stacktracesh-optionally-use-llvm-utilities
+++ a/scripts/decode_stacktrace.sh
@@ -16,6 +16,21 @@ elif type c++filt >/dev/null 2>&1 ; then
cppfilt_opts=-i
fi
+UTIL_SUFFIX=
+if [[ -z ${LLVM:-} ]]; then
+ UTIL_PREFIX=${CROSS_COMPILE:-}
+else
+ UTIL_PREFIX=llvm-
+ if [[ ${LLVM} == */ ]]; then
+ UTIL_PREFIX=${LLVM}${UTIL_PREFIX}
+ elif [[ ${LLVM} == -* ]]; then
+ UTIL_SUFFIX=${LLVM}
+ fi
+fi
+
+READELF=${UTIL_PREFIX}readelf${UTIL_SUFFIX}
+ADDR2LINE=${UTIL_PREFIX}addr2line${UTIL_SUFFIX}
+
if [[ $1 == "-r" ]] ; then
vmlinux=""
basepath="auto"
@@ -75,7 +90,7 @@ find_module() {
if [[ "$modpath" != "" ]] ; then
for fn in $(find "$modpath" -name "${module//_/[-_]}.ko*") ; do
- if readelf -WS "$fn" | grep -qwF .debug_line ; then
+ if ${READELF} -WS "$fn" | grep -qwF .debug_line ; then
echo $fn
return
fi
@@ -169,7 +184,7 @@ parse_symbol() {
if [[ $aarray_support == true && "${cache[$module,$address]+isset}" == "isset" ]]; then
local code=${cache[$module,$address]}
else
- local code=$(${CROSS_COMPILE}addr2line -i -e "$objfile" "$address" 2>/dev/null)
+ local code=$(${ADDR2LINE} -i -e "$objfile" "$address" 2>/dev/null)
if [[ $aarray_support == true ]]; then
cache[$module,$address]=$code
fi
_
Patches currently in -mm which might be from cmllamas@xxxxxxxxxx are
scripts-decode_stacktracesh-optionally-use-llvm-utilities.patch
