diff --git a/include/boost/corosio/native/detail/io_uring/io_uring_scheduler.hpp b/include/boost/corosio/native/detail/io_uring/io_uring_scheduler.hpp
index e00a405d7..31f15b9c5 100644
--- a/include/boost/corosio/native/detail/io_uring/io_uring_scheduler.hpp
+++ b/include/boost/corosio/native/detail/io_uring/io_uring_scheduler.hpp
@@ -636,7 +636,12 @@ io_uring_scheduler::post(std::coroutine_handle<> h) const
         {
             auto saved = h_;
             delete this;
+            // TSan cannot instrument standalone fences; this acquire
+            // pairs with the posting thread's release and is intentional.
+            BOOST_COROSIO_GCC_WARNING_PUSH
+            BOOST_COROSIO_GCC_WARNING_DISABLE("-Wtsan")
             std::atomic_thread_fence(std::memory_order_acquire);
+            BOOST_COROSIO_GCC_WARNING_POP
             saved.resume();
         }
 
diff --git a/include/boost/corosio/native/detail/reactor/reactor_scheduler.hpp b/include/boost/corosio/native/detail/reactor/reactor_scheduler.hpp
index 7be901417..1a46974a5 100644
--- a/include/boost/corosio/native/detail/reactor/reactor_scheduler.hpp
+++ b/include/boost/corosio/native/detail/reactor/reactor_scheduler.hpp
@@ -490,8 +490,13 @@ reactor_scheduler::post(std::coroutine_handle<> h) const
         {
             auto saved = h_;
             delete this;
-            // Ensure stores from the posting thread are visible
+            // Ensure stores from the posting thread are visible. TSan
+            // cannot instrument standalone fences; this acquire pairs
+            // with the posting thread's release and is intentional.
+            BOOST_COROSIO_GCC_WARNING_PUSH
+            BOOST_COROSIO_GCC_WARNING_DISABLE("-Wtsan")
             std::atomic_thread_fence(std::memory_order_acquire);
+            BOOST_COROSIO_GCC_WARNING_POP
             saved.resume();
         }
 
diff --git a/test/unit/Jamfile b/test/unit/Jamfile
index f6fc0d435..97ed8439c 100644
--- a/test/unit/Jamfile
+++ b/test/unit/Jamfile
@@ -21,6 +21,12 @@ project boost/corosio/test/unit
       <target-os>windows:<define>_WIN32_WINNT=0x0602
       <warnings>extra
       <warnings-as-errors>on
+      # GCC mis-analyzes the structured-binding-from-co_await idiom
+      # (auto [ec, ...] = co_await op) in coroutine frames and reports a
+      # bogus -Wmaybe-uninitialized. The pattern is unavoidable and used by
+      # most async tests, so suppress it for GCC across the test project.
+      # (The library itself is clean; see capy test/unit/Jamfile.)
+      <toolset>gcc:<cxxflags>-Wno-maybe-uninitialized
     ;
 
 # Non-TLS tests (recurses into test/, native/, etc.)