Add script for debugging

1. Setup handle SIGALRM ignore first and run qtest in gdb shell
2. Analyze core dump file

qtest.c

@@ -629,9 +629,11 @@ static bool do_show(int argc, char *argv[])
 /* Signal handlers */
 static void sigsegvhandler(int sig)
 {
-    trigger_exception(
-        "Segmentation fault occurred.  You dereferenced a NULL or invalid "
-        "pointer");
+    report(1,
+           "Segmentation fault occurred.  You dereferenced a NULL or invalid "
+           "pointer");
+    /* Raising a SIGABRT signal to produce a core dump for debugging. */
+    abort();
 }
 
 static void sigalrmhandler(int sig)

scripts/debug.py

@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+
+import argparse
+import shutil
+import subprocess
+import pathlib
+import os
+
+class Debugger:
+    def __init__(self, command, common_opts):
+        self.command = command
+        self.common_opts = common_opts
+
+    def __call__(self, argv, **kwargs):
+        g = subprocess.Popen([self.command] + self.common_opts + argv, **kwargs)
+
+        while g.returncode != 0:
+            try:
+                g.communicate()
+            except KeyboardInterrupt:
+                pass
+
+        return g
+
+    def debug(self, program):
+        return self([
+            "-ex", "handle SIGALRM ignore",
+            "-ex", "run",
+            program
+        ])
+
+    def analyze(self, program, core_file):
+        return self([
+            program,
+            core_file,
+            "-ex", "backtrace"
+        ])
+
+
+def main(argv):
+    common = [
+        "-quiet", 
+        f"-cd={ROOT}"
+    ]
+
+    gdb = Debugger(GDB_PATH, common)
+
+    if argv.debug:
+        gdb.debug(QTEST)
+
+    elif argv.analyze:
+        if not os.path.exists(CORE_DUMP):
+            print("ERROR: core dump file is not exist")
+            exit(1)
+
+        gdb.analyze(QTEST, CORE_DUMP)
+
+    else:
+        parser.print_help()
+
+if __name__ == "__main__":
+    ROOT = str(pathlib.Path(__file__).resolve().parents[1])
+    GDB_PATH = shutil.which("gdb")
+    QTEST = ROOT + "/qtest"
+    CORE_DUMP = ROOT + "/core"
+
+    parser = argparse.ArgumentParser()
+    group = parser.add_mutually_exclusive_group()
+    group.add_argument("-d", "--debug", dest="debug", action="store_true",
+                        help="Enter gdb shell")
+    group.add_argument("-a", "--analyze", dest="analyze", action="store_true", 
+                        help="Analyze the core dump file")
+    args = parser.parse_args()
+
+    if not GDB_PATH:
+        print("ERROR: gdb is not installed")
+        exit(1)
+
+    if not os.path.exists(QTEST):
+        print("ERROR: qtest is not exist")
+        exit(1)
+
+    main(args)