diff --git a/src/util/system.h b/src/util/system.h
--- a/src/util/system.h
+++ b/src/util/system.h
@@ -148,11 +148,14 @@
     };
 
     mutable CCriticalSection cs_args;
-    std::map<std::string, std::vector<std::string>> m_override_args;
-    std::map<std::string, std::vector<std::string>> m_config_args;
-    std::string m_network;
-    std::set<std::string> m_network_only_args;
-    std::map<OptionsCategory, std::map<std::string, Arg>> m_available_args;
+    std::map<std::string, std::vector<std::string>>
+        m_override_args GUARDED_BY(cs_args);
+    std::map<std::string, std::vector<std::string>>
+        m_config_args GUARDED_BY(cs_args);
+    std::string m_network GUARDED_BY(cs_args);
+    std::set<std::string> m_network_only_args GUARDED_BY(cs_args);
+    std::map<OptionsCategory, std::map<std::string, Arg>>
+        m_available_args GUARDED_BY(cs_args);
 
     bool ReadConfigStream(std::istream &stream, std::string &error,
                           bool ignore_invalid_keys = false);
@@ -275,7 +278,10 @@
     /**
      * Clear available arguments
      */
-    void ClearArgs() { m_available_args.clear(); }
+    void ClearArgs() {
+        LOCK(cs_args);
+        m_available_args.clear();
+    }
 
     /**
      * Get the help string
diff --git a/src/util/system.cpp b/src/util/system.cpp
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -195,7 +195,8 @@
     /** Determine whether to use config settings in the default section,
      *  See also comments around ArgsManager::ArgsManager() below. */
     static inline bool UseDefaultSection(const ArgsManager &am,
-                                         const std::string &arg) {
+                                         const std::string &arg)
+        EXCLUSIVE_LOCKS_REQUIRED(am.cs_args) {
         return (am.m_network == CBaseChainParams::MAIN ||
                 am.m_network_only_args.count(arg) == 0);
     }
@@ -279,7 +280,8 @@
      * confused by craziness like "[regtest] testnet=1"
      */
     static inline bool GetNetBoolArg(const ArgsManager &am,
-                                     const std::string &net_arg) {
+                                     const std::string &net_arg)
+        EXCLUSIVE_LOCKS_REQUIRED(am.cs_args) {
         std::pair<bool, std::string> found_result(false, std::string());
         found_result = GetArgHelper(am.m_override_args, net_arg, true);
         if (!found_result.first) {
@@ -353,6 +355,8 @@
 }
 
 void ArgsManager::WarnForSectionOnlyArgs() {
+    LOCK(cs_args);
+
     // if there's no section selected, don't worry
     if (m_network.empty()) {
         return;
@@ -393,6 +397,7 @@
 }
 
 void ArgsManager::SelectConfigNetwork(const std::string &network) {
+    LOCK(cs_args);
     m_network = network;
 }
 
@@ -473,6 +478,7 @@
             std::string("-") + key.substr(option_index + 1, std::string::npos);
     }
 
+    LOCK(cs_args);
     for (const auto &arg_map : m_available_args) {
         if (arg_map.second.count(arg_no_net)) {
             return true;
@@ -616,6 +622,7 @@
         eq_index = name.size();
     }
 
+    LOCK(cs_args);
     std::map<std::string, Arg> &arg_map = m_available_args[cat];
     auto ret = arg_map.emplace(
         name.substr(0, eq_index),
@@ -634,6 +641,7 @@
     const bool show_debug = gArgs.GetBoolArg("-help-debug", false);
 
     std::string usage = "";
+    LOCK(cs_args);
     for (const auto &arg_map : m_available_args) {
         switch (arg_map.first) {
             case OptionsCategory::OPTIONS:
@@ -1014,6 +1022,7 @@
 }
 
 std::string ArgsManager::GetChainName() const {
+    LOCK(cs_args);
     bool fRegTest = ArgsManagerHelper::GetNetBoolArg(*this, "-regtest");
     bool fTestNet = ArgsManagerHelper::GetNetBoolArg(*this, "-testnet");