This is a note to let you know that I've just added the patch titled
scripts/decode_stacktrace.sh: optionally use LLVM utilities
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scripts-decode_stacktrace.sh-optionally-use-llvm-uti.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 48d25a8f063530bb98041d6266c3e01040e40e48
Author: Carlos Llamas <cmllamas@xxxxxxxxxx>
Date: Fri Sep 29 03:48:17 2023 +0000
scripts/decode_stacktrace.sh: optionally use LLVM utilities
[ Upstream commit efbd6398353315b7018e6943e41fee9ec35e875f ]
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>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/scripts/decode_stacktrace.sh b/scripts/decode_stacktrace.sh
index 564c5632e1a2..bfe5a4082d8e 100755
--- a/scripts/decode_stacktrace.sh
+++ b/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
