From ca6c133042c11b614c4cd1a7b3a10eb286827bc2 Mon Sep 17 00:00:00 2001
From: Peter Barker <pbarker@barker.dropbear.id.au>
Date: Mon, 4 Jan 2021 17:02:35 +1100
Subject: [PATCH] AP_HAL_ChibiOS: do not reuse va_list after it has been ended

---
 libraries/AP_HAL_ChibiOS/system.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libraries/AP_HAL_ChibiOS/system.cpp b/libraries/AP_HAL_ChibiOS/system.cpp
index 45c5ec96b0..c827cb9dc4 100644
--- a/libraries/AP_HAL_ChibiOS/system.cpp
+++ b/libraries/AP_HAL_ChibiOS/system.cpp
@@ -226,7 +226,9 @@ void panic(const char *errormsg, ...)
 
     hal.scheduler->delay_microseconds(10000);
     while (1) {
+        va_start(ap, errormsg);
         vprintf(errormsg, ap);
+        va_end(ap);
         hal.scheduler->delay(500);
     }
 #else