ci: Improve OpenBSD core dump backtrace handling.

macdice · macdice · commit 5114d62e7499 · 2025-11-06T17:49:22.000+13:00
Since OpenBSD core dumps do not embed executable paths, the script now searches for the corresponding binary manually within the specified directory before invoking LLDB. This is imperfect but should find the right executable in practice, as needed for meaningful backtraces. Author: Nazir Bilal Yavuz <byavuz81@gmail.com> Discussion: https://postgr.es/m/CAN55FZ36R74TZ8RKsFueYwLxGKDAm3LU2FHM_ZUCSB6imd3vYA@mail.gmail.com Backpatch-through: 18
diff --git a/.cirrus.tasks.yml b/.cirrus.tasks.yml
@@ -290,6 +290,7 @@ task:
         PKGCONFIG_PATH: '/usr/lib/pkgconfig:/usr/local/lib/pkgconfig'
         UUID: -Duuid=e2fs
         TCL: -Dtcl_version=tcl86
+        CORE_DUMP_EXECUTABLE_DIR: $CIRRUS_WORKING_DIR/build/tmp_install/usr/local/pgsql/bin
       setup_additional_packages_script: |
         #pkg_add -I ...
       # Always core dump to ${CORE_DUMP_DIR}
@@ -352,7 +353,7 @@ task:
       # ${CORE_DUMP_DIR}, they may not obey this. So, move core files to the
       # ${CORE_DUMP_DIR} directory.
       find build/ -type f -name '*.core' -exec mv '{}' ${CORE_DUMP_DIR} \;
-      src/tools/ci/cores_backtrace.sh ${OS_NAME} ${CORE_DUMP_DIR}
+      src/tools/ci/cores_backtrace.sh ${OS_NAME} ${CORE_DUMP_DIR} ${CORE_DUMP_EXECUTABLE_DIR}
 
 
 # configure feature flags, shared between the task running the linux tests and
diff --git a/src/tools/ci/cores_backtrace.sh b/src/tools/ci/cores_backtrace.sh
@@ -1,12 +1,18 @@
 #! /bin/sh
 
-if [ $# -ne 2 ]; then
+os=$1
+directory=$2
+executable_directory=$3
+
+if [ "$os" != 'openbsd' ] && [ $# -ne 2 ]; then
     echo "cores_backtrace.sh <os> <directory>"
     exit 1
 fi
 
-os=$1
-directory=$2
+if [ "$os" = 'openbsd' ] && [ $# -ne 3 ]; then
+    echo "cores_backtrace.sh <os> <core_directory> <executable_directory>"
+    exit 1
+fi
 
 case $os in
     freebsd|linux|macos|netbsd|openbsd)
@@ -17,6 +23,10 @@ case $os in
     ;;
 esac
 
+if [ "$os" = 'openbsd' ]; then
+    export PATH="${executable_directory}:${PATH}"
+fi
+
 first=1
 for corefile in $(find "$directory" -type f) ; do
     if [ "$first" -eq 1 ]; then
@@ -26,8 +36,21 @@ for corefile in $(find "$directory" -type f) ; do
         echo -e '\n\n'
     fi
 
-    if [ "$os" = 'macos' ] || [ "$os" = 'openbsd' ]; then
+    if [ "$os" = 'macos' ]; then
         lldb -c $corefile --batch -o 'thread backtrace all' -o 'quit'
+    elif [ "$os" = 'openbsd' ]; then
+        # OpenBSD's ELF format doesn't include executable information, so we
+        # search for the executable manually in <executable_directory>.
+        filename=$(basename "$corefile")
+        base=$(echo "$filename" | sed 's/\.core.*$//')
+        binary=$(which "${base}")
+
+        if [ -z "$binary" ]; then
+            echo "executable ${base} not found in ${PATH}, running 'lldb' without debug information"
+            lldb -c "$corefile" --batch -o 'thread backtrace all' -o 'quit'
+        else
+            lldb "$binary" -c "$corefile" --batch -o 'thread backtrace all' -o 'quit'
+        fi
     else
         auxv=$(gdb --quiet --core ${corefile} --batch -ex 'info auxv' 2>/dev/null)
         if [ $? -ne 0 ]; then
