[init] Read/decode asmap before constructing addrman

Commit 181a120 introduced an initialization order bug: CAddrMan's
m_asmap must be set before deserializing peers.dat. Restore that
ordering.

review hint: use

`git diff --color-moved=dimmed-zebra --color-moved-ws=ignore-all-space`

Author: jnewbery

src/init.cpp

@@ -1171,10 +1171,39 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
     fDiscover = args.GetBoolArg("-discover", true);
     const bool ignores_incoming_txs{args.GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY)};
 
-    assert(!node.addrman);
-    auto check_addrman = std::clamp<int32_t>(args.GetArg("-checkaddrman", DEFAULT_ADDRMAN_CONSISTENCY_CHECKS), 0, 1000000);
-    node.addrman = std::make_unique<CAddrMan>(/* deterministic */ false, /* consistency_check_ratio */ check_addrman);
     {
+        // Initialize addrman
+        assert(!node.addrman);
+
+        // Read asmap file if configured
+        std::vector<bool> asmap;
+        if (args.IsArgSet("-asmap")) {
+            fs::path asmap_path = fs::path(args.GetArg("-asmap", ""));
+            if (asmap_path.empty()) {
+                asmap_path = DEFAULT_ASMAP_FILENAME;
+            }
+            if (!asmap_path.is_absolute()) {
+                asmap_path = gArgs.GetDataDirNet() / asmap_path;
+            }
+            if (!fs::exists(asmap_path)) {
+                InitError(strprintf(_("Could not find asmap file %s"), asmap_path));
+                return false;
+            }
+            asmap = CAddrMan::DecodeAsmap(asmap_path);
+            if (asmap.size() == 0) {
+                InitError(strprintf(_("Could not parse asmap file %s"), asmap_path));
+                return false;
+            }
+            const uint256 asmap_version = SerializeHash(asmap);
+            LogPrintf("Using asmap version %s for IP bucketing\n", asmap_version.ToString());
+        } else {
+            LogPrintf("Using /16 prefix for IP bucketing\n");
+        }
+
+        auto check_addrman = std::clamp<int32_t>(args.GetArg("-checkaddrman", DEFAULT_ADDRMAN_CONSISTENCY_CHECKS), 0, 1000000);
+        node.addrman = std::make_unique<CAddrMan>(/* deterministic */ false, /* consistency_check_ratio */ check_addrman);
+        node.addrman->m_asmap = asmap;
+
         // Load addresses from peers.dat
         uiInterface.InitMessage(_("Loading P2P addresses…").translated);
         int64_t nStart = GetTimeMillis();
@@ -1184,10 +1213,12 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
         } else {
             // Addrman can be in an inconsistent state after failure, reset it
             node.addrman = std::make_unique<CAddrMan>(/* deterministic */ false, /* consistency_check_ratio */ check_addrman);
+            node.addrman->m_asmap = asmap;
             LogPrintf("Recreating peers.dat\n");
             adb.Write(*node.addrman);
         }
     }
+
     assert(!node.banman);
     node.banman = std::make_unique<BanMan>(gArgs.GetDataDirNet() / "banlist", &uiInterface, args.GetArg("-bantime", DEFAULT_MISBEHAVING_BANTIME));
     assert(!node.connman);
@@ -1292,31 +1323,6 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
             return InitError(ResolveErrMsg("externalip", strAddr));
     }
 
-    // Read asmap file if configured
-    if (args.IsArgSet("-asmap")) {
-        fs::path asmap_path = fs::path(args.GetArg("-asmap", ""));
-        if (asmap_path.empty()) {
-            asmap_path = DEFAULT_ASMAP_FILENAME;
-        }
-        if (!asmap_path.is_absolute()) {
-            asmap_path = gArgs.GetDataDirNet() / asmap_path;
-        }
-        if (!fs::exists(asmap_path)) {
-            InitError(strprintf(_("Could not find asmap file %s"), asmap_path));
-            return false;
-        }
-        std::vector<bool> asmap = CAddrMan::DecodeAsmap(asmap_path);
-        if (asmap.size() == 0) {
-            InitError(strprintf(_("Could not parse asmap file %s"), asmap_path));
-            return false;
-        }
-        const uint256 asmap_version = SerializeHash(asmap);
-        node.connman->SetAsmap(std::move(asmap));
-        LogPrintf("Using asmap version %s for IP bucketing\n", asmap_version.ToString());
-    } else {
-        LogPrintf("Using /16 prefix for IP bucketing\n");
-    }
-
 #if ENABLE_ZMQ
     g_zmq_notification_interface = CZMQNotificationInterface::Create();