From 323c16a5fbe53dffbbe6a83e79cd48e90ea4a59d Mon Sep 17 00:00:00 2001
From: huangkai8 <huangkai8@xiaomi.com>
Date: Wed, 19 Apr 2023 16:01:43 +0800
Subject: [PATCH] Wrong start and end values would make dead cycle. Exchange
 the values when start value is bigger than end value.

---
 system/dumpstack/dumpstack.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/system/dumpstack/dumpstack.c b/system/dumpstack/dumpstack.c
index 94af6483a..d779f8084 100644
--- a/system/dumpstack/dumpstack.c
+++ b/system/dumpstack/dumpstack.c
@@ -44,6 +44,7 @@ int main(int argc, FAR char *argv[])
 {
   int spid = -1;
   int epid = -1;
+  int tmp = -1;
 
   if (argc == 2)
     {
@@ -60,6 +61,13 @@ int main(int argc, FAR char *argv[])
       spid = epid = gettid();
     }
 
+  if (spid > epid)
+    {
+      tmp = spid;
+      spid = epid;
+      epid = tmp;
+    }
+
   do
     {
       sched_dumpstack(spid);