fix gdb cmd
diff --git a/heron/shell/src/python/handlers/killexecutorhandler.py b/heron/shell/src/python/handlers/killexecutorhandler.py
index de0035b..6484da2 100644
--- a/heron/shell/src/python/handlers/killexecutorhandler.py
+++ b/heron/shell/src/python/handlers/killexecutorhandler.py
@@ -40,7 +40,7 @@
       status_finish(200)
       try:
         logger.info("Print stmgr backtrace to ./stmgr.bt")
-        cmd = 'timeout 3 gdb -batch -ex "thread apply all bt" -p `cat stmgr-1.pid` 2&>1 > stmgr.bt'
+        cmd = 'timeout 3 gdb -batch -ex "thread apply all bt" -p `cat stmgr-*.pid` 2&>1 > stmgr.bt'
         subprocess.call(cmd, shell=True)
       except Exception:
         logger.warning("Exception: ")