From a829ca9104ea7e784b634b303ddc0073dfeb76ae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Canna=C3=B2?= <rene.cannao@gmail.com>
Date: Wed, 29 Apr 2020 20:02:44 +0200
Subject: [PATCH] Generate a detailed backtrace on crash

---
 lib/ProxySQL_GloVars.cpp | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/lib/ProxySQL_GloVars.cpp b/lib/ProxySQL_GloVars.cpp
index ea7a02948..84fbe2a15 100644
--- a/lib/ProxySQL_GloVars.cpp
+++ b/lib/ProxySQL_GloVars.cpp
@@ -4,6 +4,7 @@
 #include <string>
 #include <sys/utsname.h>
 #include "SpookyV2.h"
+#include <cxxabi.h>
 
 static void term_handler(int sig) {
   proxy_warning("Received TERM signal: shutdown in progress...\n");
@@ -17,6 +18,8 @@ void crash_handler(int sig) {
 //	malloc_stats_print(NULL, NULL, "");
 #endif
 #ifdef __GLIBC__
+#define DEBUG_MSG_MAXSIZE	1024
+	char debugbuff[DEBUG_MSG_MAXSIZE];
 	void *arr[20];
 	size_t s;
 
@@ -24,6 +27,26 @@ void crash_handler(int sig) {
 
 	fprintf(stderr, "Error: signal %d:\n", sig);
 	backtrace_symbols_fd(arr, s, STDERR_FILENO);
+
+	char **strings;
+	strings=backtrace_symbols(arr,s);
+	if (strings == NULL) {
+		perror("backtrace_symbols failed!");
+	} else {
+		for (unsigned int i=0; i<s; i++) {
+			debugbuff[0]=0;
+			sscanf(strings[i], "%*[^(](%100[^+]", debugbuff);
+			int status;
+			char *realname=NULL;
+			realname=abi::__cxa_demangle(debugbuff, 0, 0, &status);
+			if (realname) {
+				fprintf(stderr," ---- %s : %s\n", strings[i], realname);
+			}
+		}
+		//free(strings); // we don't free, we are crashing anyway
+	}
+
+
 #endif /* __GLIBC__ */
 	// try to generate a core dump signaling again the thread
 	signal(sig, SIG_DFL);