diff --git a/src/managers/dpdk/daqiri_dpdk_mgr.cpp b/src/managers/dpdk/daqiri_dpdk_mgr.cpp
index de695dc..fc6151a 100644
--- a/src/managers/dpdk/daqiri_dpdk_mgr.cpp
+++ b/src/managers/dpdk/daqiri_dpdk_mgr.cpp
@@ -4403,6 +4403,11 @@ Status DpdkMgr::send_tx_burst(BurstParams* burst) {
 }
 
 void DpdkMgr::shutdown() {
+  // Idempotency guard: shutdown() may be invoked a second time via ~DpdkMgr
+  // during C++ __cxa_finalize, by which point the spdlog default logger has
+  // already been destroyed and any DAQIRI_LOG_INFO here crashes inside
+  // spdlog::sink_it_. Skip the body (and the log calls) if already torn down.
+  if (!initialized_) { return; }
   DAQIRI_LOG_INFO("daqiri DPDK manager shutdown called {}", num_init);
 
   if (--num_init == 0) {
diff --git a/src/managers/rdma/daqiri_rdma_mgr.cpp b/src/managers/rdma/daqiri_rdma_mgr.cpp
index df88152..e525eeb 100644
--- a/src/managers/rdma/daqiri_rdma_mgr.cpp
+++ b/src/managers/rdma/daqiri_rdma_mgr.cpp
@@ -1508,6 +1508,12 @@ void RdmaMgr::initialize() {
 }
 
 void RdmaMgr::shutdown() {
+  // Idempotency guard: shutdown() runs explicitly from the caller AND again
+  // from ~RdmaMgr / ~SocketMgr during C++ __cxa_finalize. By the second call
+  // the spdlog default logger (a function-local static created lazily on the
+  // first DAQIRI_LOG_INFO) has already been destroyed, so any logging here
+  // crashes inside spdlog::sink_it_. Skip the whole body on subsequent calls.
+  if (!initialized_) { return; }
   DAQIRI_LOG_INFO("RDMA manager shutting down");
   rdma_force_quit.store(true);
 
diff --git a/src/managers/socket/daqiri_socket_mgr.cpp b/src/managers/socket/daqiri_socket_mgr.cpp
index 3ccec89..9f16a66 100644
--- a/src/managers/socket/daqiri_socket_mgr.cpp
+++ b/src/managers/socket/daqiri_socket_mgr.cpp
@@ -466,6 +466,21 @@ void SocketMgr::clear_rx_queues() {
 }
 
 void SocketMgr::shutdown() {
+  // Idempotency guard: shutdown() may be invoked a second time via
+  // ~SocketMgr during C++ __cxa_finalize, after the spdlog default logger
+  // has been destroyed. Any DAQIRI_LOG_INFO from the cascade (here, the
+  // RoCE branch, or the manager method this delegates to) would then crash
+  // inside spdlog::sink_it_. Skip the whole body on subsequent calls.
+  //
+  // The guard checks BOTH flags because initialize() sets initialized_=false
+  // and running_=true before running setup, then sets initialized_=true on
+  // success. If setup throws, the catch block calls shutdown() with
+  // initialized_=false and running_=true to clean up any threads/sockets
+  // that were spawned partway. Guarding on initialized_ alone would skip
+  // that cleanup. Both flags are only cleared together after a successful
+  // shutdown() body, so the post-shutdown re-entry from __cxa_finalize is
+  // the only case where the guard fires.
+  if (!initialized_ && !running_.load()) { return; }
   if (is_roce_protocol()) {
 #if DAQIRI_MGR_RDMA
     if (roce_mgr_ != nullptr) {
@@ -476,8 +491,6 @@ void SocketMgr::shutdown() {
     return;
   }
 
-  if (!initialized_ && !running_.load()) { return; }
-
   running_.store(false);
 
   for (auto& ep : endpoints_) {