From 071197fb64ed618fdff1c6974b2094b9d9fdce10 Mon Sep 17 00:00:00 2001
From: Dave-in-lafayette <64047859+Dave-in-lafayette@users.noreply.github.com>
Date: Mon, 20 Apr 2020 16:34:36 -0700
Subject: [PATCH] fix for unintended crash during panic response

If redis crashes early, before lua is set up (like, if File Descriptor 0 is closed before exec), it will crash again trying to print memory statistics.
---
 src/server.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/server.c b/src/server.c
index fc9b87aae..ebd8c61c1 100644
--- a/src/server.c
+++ b/src/server.c
@@ -4037,7 +4037,7 @@ sds genRedisInfoString(const char *section) {
         size_t zmalloc_used = zmalloc_used_memory();
         size_t total_system_mem = server.system_memory_size;
         const char *evict_policy = evictPolicyToString();
-        long long memory_lua = (long long)lua_gc(server.lua,LUA_GCCOUNT,0)*1024;
+        long long memory_lua = server.lua ? (long long)lua_gc(server.lua,LUA_GCCOUNT,0)*1024 : 0;
         struct redisMemOverhead *mh = getMemoryOverheadData();
 
         /* Peak memory is updated from time to time by serverCron() so it