diff --git a/ci/test/00_setup_env_native_fuzz_with_valgrind.sh b/ci/test/00_setup_env_native_fuzz_with_valgrind.sh
index 2e500abf821..cc3a7c328eb 100755
--- a/ci/test/00_setup_env_native_fuzz_with_valgrind.sh
+++ b/ci/test/00_setup_env_native_fuzz_with_valgrind.sh
@@ -8,7 +8,7 @@ export LC_ALL=C.UTF-8
 
 export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:24.04"
 export CONTAINER_NAME=ci_native_fuzz_valgrind
-export PACKAGES="clang-16 llvm-16 libclang-rt-16-dev libevent-dev libboost-dev libsqlite3-dev valgrind"
+export PACKAGES="libevent-dev libboost-dev libsqlite3-dev valgrind"
 export NO_DEPENDS=1
 export RUN_UNIT_TESTS=false
 export RUN_FUNCTIONAL_TESTS=false
@@ -17,8 +17,4 @@ export FUZZ_TESTS_CONFIG="--valgrind"
 export GOAL="all"
 export BITCOIN_CONFIG="\
  -DBUILD_FOR_FUZZING=ON \
- -DSANITIZERS=fuzzer \
- -DCMAKE_C_COMPILER=clang-16 \
- -DCMAKE_CXX_COMPILER=clang++-16 \
 "
-export LLVM_SYMBOLIZER_PATH="/usr/bin/llvm-symbolizer-16"
diff --git a/ci/test/00_setup_env_native_valgrind.sh b/ci/test/00_setup_env_native_valgrind.sh
index 22d9d812404..347a1135056 100755
--- a/ci/test/00_setup_env_native_valgrind.sh
+++ b/ci/test/00_setup_env_native_valgrind.sh
@@ -8,7 +8,7 @@ export LC_ALL=C.UTF-8
 
 export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:24.04"
 export CONTAINER_NAME=ci_native_valgrind
-export PACKAGES="valgrind clang-16 llvm-16 libclang-rt-16-dev python3-zmq libevent-dev libboost-dev libdb5.3++-dev libzmq3-dev libsqlite3-dev"
+export PACKAGES="valgrind python3-zmq libevent-dev libboost-dev libdb5.3++-dev libzmq3-dev libsqlite3-dev"
 export USE_VALGRIND=1
 export NO_DEPENDS=1
 export TEST_RUNNER_EXTRA="--exclude feature_init,rpc_bind,feature_bind_extra"  # feature_init excluded for now, see https://github.com/bitcoin/bitcoin/issues/30011 ; bind tests excluded for now, see https://github.com/bitcoin/bitcoin/issues/17765#issuecomment-602068547
@@ -16,6 +16,4 @@ export GOAL="install"
 # TODO enable GUI
 export BITCOIN_CONFIG="\
  -DWITH_ZMQ=ON -DWITH_BDB=ON -DWARN_INCOMPATIBLE_BDB=OFF -DBUILD_GUI=OFF \
- -DCMAKE_C_COMPILER=clang-16 \
- -DCMAKE_CXX_COMPILER=clang++-16 \
 "
diff --git a/contrib/valgrind.supp b/contrib/valgrind.supp
index 9a9e640c615..a0a82d05010 100644
--- a/contrib/valgrind.supp
+++ b/contrib/valgrind.supp
@@ -12,9 +12,8 @@
 #       --error-limit=no build/bin/test_bitcoin
 #
 # Note that suppressions may depend on OS and/or library versions.
-# Tested on:
-# * aarch64 (Ubuntu Noble system libs, clang, without gui)
-# * x86_64  (Ubuntu Noble system libs, clang, without gui)
+# Tested on aarch64 and x86_64 with Ubuntu Noble system libs, using clang-16
+# and GCC, without gui.
 {
    Suppress libdb warning - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=662917
    Memcheck:Cond
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index a39c81d13a8..0b25396dd21 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -6,40 +6,55 @@
 #include <net_processing.h>
 
 #include <addrman.h>
+#include <arith_uint256.h>
 #include <banman.h>
 #include <blockencodings.h>
 #include <blockfilter.h>
+#include <chain.h>
 #include <chainparams.h>
+#include <common/bloom.h>
 #include <consensus/amount.h>
+#include <consensus/params.h>
 #include <consensus/validation.h>
+#include <core_memusage.h>
+#include <crypto/siphash.h>
 #include <deploymentstatus.h>
-#include <hash.h>
+#include <flatfile.h>
 #include <headerssync.h>
 #include <index/blockfilterindex.h>
 #include <kernel/chain.h>
-#include <kernel/mempool_entry.h>
 #include <logging.h>
 #include <merkleblock.h>
+#include <net.h>
+#include <net_permissions.h>
+#include <netaddress.h>
 #include <netbase.h>
 #include <netmessagemaker.h>
 #include <node/blockstorage.h>
+#include <node/connection_types.h>
+#include <node/protocol_version.h>
 #include <node/timeoffsets.h>
 #include <node/txdownloadman.h>
 #include <node/txreconciliation.h>
 #include <node/warnings.h>
+#include <policy/feerate.h>
 #include <policy/fees.h>
+#include <policy/packages.h>
 #include <policy/policy.h>
-#include <policy/settings.h>
 #include <primitives/block.h>
 #include <primitives/transaction.h>
+#include <protocol.h>
 #include <random.h>
 #include <scheduler.h>
+#include <script/script.h>
+#include <serialize.h>
+#include <span.h>
 #include <streams.h>
 #include <sync.h>
 #include <tinyformat.h>
 #include <txmempool.h>
 #include <txorphanage.h>
-#include <txrequest.h>
+#include <uint256.h>
 #include <util/check.h>
 #include <util/strencodings.h>
 #include <util/time.h>
@@ -47,11 +62,26 @@
 #include <validation.h>
 
 #include <algorithm>
+#include <array>
 #include <atomic>
+#include <compare>
+#include <cstddef>
+#include <deque>
+#include <exception>
+#include <functional>
 #include <future>
+#include <initializer_list>
+#include <iterator>
+#include <limits>
+#include <list>
+#include <map>
 #include <memory>
 #include <optional>
+#include <queue>
 #include <ranges>
+#include <ratio>
+#include <set>
+#include <span>
 #include <typeinfo>
 #include <utility>
 
@@ -1156,7 +1186,7 @@ void PeerManagerImpl::RemoveBlockRequest(const uint256& hash, std::optional<Node
     Assume(mapBlocksInFlight.count(hash) <= MAX_CMPCTBLOCKS_INFLIGHT_PER_BLOCK);
 
     while (range.first != range.second) {
-        auto [node_id, list_it] = range.first->second;
+        const auto& [node_id, list_it]{range.first->second};
 
         if (from_peer && *from_peer != node_id) {
             range.first++;
diff --git a/src/net_processing.h b/src/net_processing.h
index 0d2dc59c5ae..1156ec08f73 100644
--- a/src/net_processing.h
+++ b/src/net_processing.h
@@ -1,21 +1,34 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2022 The Bitcoin Core developers
+// Copyright (c) 2009-present The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_NET_PROCESSING_H
 #define BITCOIN_NET_PROCESSING_H
 
+#include <consensus/amount.h>
 #include <net.h>
+#include <protocol.h>
+#include <threadsafety.h>
 #include <txorphanage.h>
 #include <validationinterface.h>
 
+#include <atomic>
 #include <chrono>
+#include <cstdint>
+#include <memory>
+#include <optional>
+#include <string>
+#include <vector>
 
 class AddrMan;
-class CChainParams;
 class CTxMemPool;
 class ChainstateManager;
+class BanMan;
+class CBlockIndex;
+class CScheduler;
+class DataStream;
+class uint256;
 
 namespace node {
 class Warnings;