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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>
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@ -12,9 +12,40 @@ fi
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vmlinux=$1
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basepath=${2-auto}
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modpath=$3
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release=""
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declare -A cache
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declare -A modcache
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find_module() {
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if [[ "$modpath" != "" ]] ; then
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for fn in $(find "$modpath" -name "${module//_/[-_]}.ko*") ; do
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if readelf -WS "$fn" | grep -qwF .debug_line ; then
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echo $fn
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return
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fi
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done
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return 1
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fi
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modpath=$(dirname "$vmlinux")
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find_module && return
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if [[ $release == "" ]] ; then
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release=$(gdb -ex 'print init_uts_ns.name.release' -ex 'quit' -quiet -batch "$vmlinux" | sed -n 's/\$1 = "\(.*\)".*/\1/p')
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fi
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for dn in {/usr/lib/debug,}/lib/modules/$release ; do
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if [ -e "$dn" ] ; then
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modpath="$dn"
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find_module && return
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fi
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done
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modpath=""
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return 1
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}
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parse_symbol() {
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# The structure of symbol at this point is:
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# ([name]+[offset]/[total length])
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@ -27,12 +58,11 @@ parse_symbol() {
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elif [[ "${modcache[$module]+isset}" == "isset" ]]; then
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local objfile=${modcache[$module]}
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else
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if [[ $modpath == "" ]]; then
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local objfile=$(find_module)
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if [[ $objfile == "" ]] ; then
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echo "WARNING! Modules path isn't set, but is needed to parse this symbol" >&2
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return
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fi
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local objfile=$(find "$modpath" -name "${module//_/[-_]}.ko*" -print -quit)
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[[ $objfile == "" ]] && return
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modcache[$module]=$objfile
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fi
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