ldso: defer execution of static constructors

Ldso now does not automatically execute static constructors of the
binary and shared libraries the binary depends on. If static
construction is required (e.g., if a shared library with constructor is
used or a compilation unit contains global statics) the component needs
to execute the constructors explicitly in Component::construct() via
Genode::Env::exec_static_constructors().

In the case of libc components this is done by the libc startup code
(i.e., the Component::construct() implementation in the libc).

The loading of shared objects at runtime is not affected by this change
and constructors of those objects are executed immediately.

Fixes #2332

repos/base/include/base/env.h

@@ -128,6 +128,17 @@ struct Genode::Env
 	 * Close session and block until the session is gone
 	 */
 	virtual void close(Parent::Client::Id) = 0;
+
+	/**
+	 * Excecute pending static constructors
+	 *
+	 * On component startup, the dynamic linker does not call possible static
+	 * constructors in the binary and shared libraries the binary depends on. If
+	 * the component requires static construction it needs to call this function
+	 * at construction time explicitly. For example, the libc implementation
+         * executes this function before constructing libc components.
+	 */
+	virtual void exec_static_constructors() = 0;
 };
 
 #endif /* _INCLUDE__BASE__ENV_H_ */

repos/base/src/include/base/internal/globals.h

@@ -35,6 +35,7 @@ namespace Genode {
 	void init_signal_thread(Env &);
 	void init_root_proxy(Env &);
 	void init_log();
+	void exec_static_constructors();
 
 	Id_space<Parent::Client> &env_session_id_space();
 	Env &internal_env();

repos/base/src/lib/base/component.cc

@@ -27,6 +27,15 @@
  */
 static Genode::Env *env_ptr = nullptr;
 
+/**
+ * Excecute pending static constructors
+ *
+ * The weak function is used for statically linked binaries. The dynamic linker
+ * provides the real implementation for dynamically linked components.
+ */
+void Genode::exec_static_constructors() __attribute__((weak));
+void Genode::exec_static_constructors() { }
+
 namespace {
 
 	using namespace Genode;
@@ -184,6 +193,11 @@ namespace {
 			if (_parent.close(id) == Parent::CLOSE_PENDING)
 				_block_for_session();
 		}
+
+		void exec_static_constructors() override
+		{
+			Genode::exec_static_constructors();
+		}
 	};
 }
 

repos/base/src/lib/ldso/dependency.cc

@@ -91,5 +91,5 @@ Linker::Root_object::Root_object(Env &env, Allocator &md_alloc,
 	new (md_alloc) Dependency(env, md_alloc, linker_name(), this, _deps, DONT_KEEP);
 
 	/* relocate and call constructors */
-	Init::list()->initialize(bind);
+	Init::list()->initialize(bind, STAGE_SO);
 }

repos/base/src/lib/ldso/include/dynamic.h

@@ -126,7 +126,7 @@ class Linker::Dynamic
 		{
 			if (!_md_alloc) {
 				error("unexpected call of section_dt_needed");
-				return;
+				throw Fatal();
 			}
 			Needed *n = new (*_md_alloc) Needed(d->un.ptr);
 			_needed.enqueue(n);

repos/base/src/lib/ldso/include/init.h

@@ -36,6 +36,18 @@ struct Linker::Init : List<Object>
 		return &_list;
 	}
 
+	bool contains_deps() const
+	{
+		for (Object const *obj = first(); obj; obj = obj->next_init()) {
+			if (obj->is_linker()) continue;
+			if (obj->is_binary()) continue;
+
+			return true;
+		}
+
+		return false;
+	}
+
 	Object *contains(char const *file)
 	{
 		for (Object *elf = first(); elf; elf = elf->next_init())
@@ -62,7 +74,7 @@ struct Linker::Init : List<Object>
 		});
 	}
 
-	void initialize(Bind bind)
+	void initialize(Bind bind, Stage stage)
 	{
 		Object *obj = first();
 
@@ -74,7 +86,7 @@ struct Linker::Init : List<Object>
 		}
 
 		/*
-		 * Recursive initialization call is not allowed here. This might happend
+		 * Recursive initialization call is not allowed here. This might happen
 		 * when Shared_objects (e.g. dlopen and friends) are constructed from within
 		 * global constructors (ctors).
 		 */
@@ -83,10 +95,21 @@ struct Linker::Init : List<Object>
 			return;
 		}
 
+		/*
+		 * We do not call static constructors in the binary stage as this must
+		 * be done by the component itself. Later for shared objects, the
+		 * constructors are executed immediately.
+		 */
+		if (stage != STAGE_BINARY)
+			exec_static_constructors();
+	}
+
+	void exec_static_constructors()
+	{
 		in_progress = true;
 
 		/* call static constructors */
-		obj = first();
+		Object *obj = first();
 		while (obj) {
 
 			Object *next = obj->next_init();

repos/base/src/lib/ldso/include/types.h

@@ -32,6 +32,7 @@ namespace Linker {
 	class Incompatible : Exception  { };
 	class Invalid_file : Exception  { };
 	class Not_found    : Exception  { };
+	class Fatal        : Exception  { };
 
 	enum Keep { DONT_KEEP = Shared_object::DONT_KEEP,
 	            KEEP      = Shared_object::KEEP };
@@ -39,6 +40,8 @@ namespace Linker {
 	enum Bind { BIND_LAZY = Shared_object::BIND_LAZY,
 	            BIND_NOW  = Shared_object::BIND_NOW };
 
+	enum Stage { STAGE_BINARY, STAGE_SO };
+
 	/**
 	 * Invariants
 	 */

repos/base/src/lib/ldso/main.cc

@@ -290,7 +290,10 @@ Elf::Addr Ld::jmp_slot(Dependency const &dep, Elf::Size index)
 		Reloc_jmpslot slot(dep, dep.obj().dynamic().pltrel_type(), 
 		                   dep.obj().dynamic().pltrel(), index);
 		return slot.target_addr();
-	} catch (...) { error("LD: jump slot relocation failed. FATAL!"); }
+	} catch (...) {
+		error("LD: jump slot relocation failed. FATAL!");
+		throw;
+	}
 
 	return 0;
 }
@@ -336,6 +339,8 @@ static void exit_on_suspended() { genode_exit(exit_status); }
  */
 struct Linker::Binary : Root_object, Elf_object
 {
+	bool static_construction_finished = false;
+
 	Binary(Env &env, Allocator &md_alloc, Bind bind)
 	:
 		Root_object(md_alloc),
@@ -357,7 +362,7 @@ struct Linker::Binary : Root_object, Elf_object
 		binary->load_needed(env, md_alloc, deps(), DONT_KEEP);
 
 		/* relocate and call constructors */
-		Init::list()->initialize(bind);
+		Init::list()->initialize(bind, STAGE_BINARY);
 	}
 
 	Elf::Addr lookup_symbol(char const *name)
@@ -370,6 +375,32 @@ struct Linker::Binary : Root_object, Elf_object
 		catch (Linker::Not_found) { return 0; }
 	}
 
+	bool static_construction_pending()
+	{
+		if (static_construction_finished) return false;
+
+		Func * const ctors_start = (Func *)lookup_symbol("_ctors_start");
+		Func * const ctors_end   = (Func *)lookup_symbol("_ctors_end");
+
+		return (ctors_end != ctors_start) || Init::list()->contains_deps();
+	}
+
+	void finish_static_construction()
+	{
+		Init::list()->exec_static_constructors();
+
+		/* call static construtors and register destructors */
+		Func * const ctors_start = (Func *)lookup_symbol("_ctors_start");
+		Func * const ctors_end   = (Func *)lookup_symbol("_ctors_end");
+		for (Func * ctor = ctors_end; ctor != ctors_start; (*--ctor)());
+
+		Func * const dtors_start = (Func *)lookup_symbol("_dtors_start");
+		Func * const dtors_end   = (Func *)lookup_symbol("_dtors_end");
+		for (Func * dtor = dtors_start; dtor != dtors_end; genode_atexit(*dtor++));
+
+		static_construction_finished = true;
+	}
+
 	void call_entry_point(Env &env)
 	{
 		/* apply the component-provided stack size */
@@ -382,18 +413,16 @@ struct Linker::Binary : Root_object, Elf_object
 			Thread::myself()->stack_size(stack_size);
 		}
 
-		/* call static construtors and register destructors */
-		Func * const ctors_start = (Func *)lookup_symbol("_ctors_start");
-		Func * const ctors_end   = (Func *)lookup_symbol("_ctors_end");
-		for (Func * ctor = ctors_end; ctor != ctors_start; (*--ctor)());
-
-		Func * const dtors_start = (Func *)lookup_symbol("_dtors_start");
-		Func * const dtors_end   = (Func *)lookup_symbol("_dtors_end");
-		for (Func * dtor = dtors_start; dtor != dtors_end; genode_atexit(*dtor++));
-
 		/* call 'Component::construct' function if present */
 		if (Elf::Addr addr = lookup_symbol("_ZN9Component9constructERN6Genode3EnvE")) {
 			((void(*)(Env &))addr)(env);
+
+			if (static_construction_pending()) {
+				error("Component::construct() returned without executing "
+				      "pending static constructors (fix by calling "
+				      "Genode::Env::exec_static_constructors())");
+				throw Fatal();
+			}
 			return;
 		}
 
@@ -406,6 +435,9 @@ struct Linker::Binary : Root_object, Elf_object
 		if (Elf::Addr addr = lookup_symbol("main")) {
 			warning("using legacy main function, please convert to 'Component::construct'");
 
+			/* execute static constructors before calling legacy 'main' */
+			finish_static_construction();
+
 			exit_status = ((int (*)(int, char **, char **))addr)(genode_argc,
 			                                                     genode_argv,
 			                                                     genode_envp);
@@ -418,6 +450,7 @@ struct Linker::Binary : Root_object, Elf_object
 		}
 
 		error("dynamic linker: component-entrypoint lookup failed");
+		throw Fatal();
 	}
 
 	void relocate(Bind bind) override
@@ -612,6 +645,11 @@ void Genode::init_ldso_phdr(Env &env)
 		Ld::linker().load_phdr(env, *heap());
 }
 
+void Genode::exec_static_constructors()
+{
+	binary_ptr->finish_static_construction();
+}
+
 
 void Component::construct(Genode::Env &env)
 {

repos/dde_bsd/src/drivers/audio/main.cc

@@ -532,8 +532,10 @@ struct Main
 };
 
 
-/***************
- ** Component **
- ***************/
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
 
-void Component::construct(Genode::Env &env) { static Main server(env); }
+	static Main server(env);
+}

repos/dde_ipxe/src/drivers/nic/main.cc

@@ -160,4 +160,10 @@ struct Main
 	}
 };
 
-void Component::construct(Genode::Env &env) { static Main main(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Main main(env);
+}

repos/dde_linux/src/drivers/framebuffer/intel/main.cc

@@ -121,4 +121,10 @@ static void run_linux(void * m)
 }
 
 
-void Component::construct(Genode::Env &env) { static Main m(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Main m(env);
+}

repos/dde_linux/src/drivers/usb/main.cc

@@ -16,4 +16,10 @@
 extern void start_usb_driver(Genode::Env &env);
 
 
-void Component::construct(Genode::Env &env) { start_usb_driver(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	start_usb_driver(env);
+}

repos/dde_rump/src/server/rump_cgd/main.cc

@@ -49,4 +49,10 @@ struct Main
 };
 
 
-void Component::construct(Genode::Env &env) { static Main inst(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Main inst(env);
+}

repos/dde_rump/src/server/rump_fs/main.cc

@@ -521,4 +521,10 @@ struct File_system::Main
 };
 
 
-void Component::construct(Genode::Env &env) { static File_system::Main inst(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics (uses shared objects) */
+	env.exec_static_constructors();
+
+	static File_system::Main inst(env);
+}

repos/demo/src/app/launchpad/main.cc

@@ -160,4 +160,10 @@ struct Main : Scout::Event_handler
 };
 
 
-void Component::construct(Genode::Env &env) { static Main main(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Main main(env);
+}

repos/demo/src/app/scout/main.cc

@@ -168,4 +168,10 @@ struct Scout::Main : Scout::Event_handler
 };
 
 
-void Component::construct(Genode::Env &env) { static Scout::Main main(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Scout::Main main(env);
+}

repos/demo/src/server/liquid_framebuffer/main.cc

@@ -311,4 +311,10 @@ class Liquid_fb::Main : public Scout::Event_handler
 };
 
 
-void Component::construct(Genode::Env &env) { static Liquid_fb::Main main(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Liquid_fb::Main main(env);
+}

repos/demo/src/server/nitlog/main.cc

@@ -496,4 +496,10 @@ struct Nitlog::Main
 };
 
 
-void Component::construct(Genode::Env &env) { static Nitlog::Main main(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Nitlog::Main main(env);
+}

repos/gems/src/server/cpu_sampler/main.cc

@@ -194,4 +194,10 @@ struct Cpu_sampler::Main : Thread_list_change_handler
  ** Component **
  ***************/
 
-void Component::construct(Genode::Env &env) { static Cpu_sampler::Main inst(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics (uses shared objects) */
+	env.exec_static_constructors();
+
+	static Cpu_sampler::Main inst(env);
+}

repos/gems/src/server/terminal/main.cc

@@ -690,6 +690,9 @@ extern char _binary_terminus_16_tff_start;
 
 void Component::construct(Genode::Env &env)
 {
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
 	using namespace Genode;
 
 	Attached_rom_dataspace config(env, "config");

repos/libports/src/app/acpica/os.cc

@@ -304,6 +304,13 @@ ACPI_STATUS AcpiOsInstallInterruptHandler(UINT32 irq, ACPI_OSD_HANDLER handler,
 
 
 /* used by normal (no-printf-debug) target */
-void Component::construct(Genode::Env &env) { static Acpica::Main main(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Acpica::Main main(env);
+}
+
 /* used by debug target (using printf of libc) */
 void Libc::Component::construct(Libc::Env &env) { static Acpica::Main main(env); }

repos/libports/src/app/qt5/qt_launchpad/main.cpp

@@ -54,6 +54,8 @@ struct Qt_launchpad_namespace::Local_env : Genode::Env
 	{ return genode_env.upgrade(id, args); }
 
 	void close(Parent::Client::Id id) { return genode_env.close(id); }
+
+	void exec_static_constructors() override { }
 };
 
 

repos/libports/src/drivers/framebuffer/vesa/main.cc

@@ -243,4 +243,10 @@ struct Framebuffer::Main
 };
 
 
-void Component::construct(Genode::Env &env) { static Framebuffer::Main inst(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Framebuffer::Main inst(env);
+}

repos/libports/src/lib/libc/task.cc

@@ -159,6 +159,9 @@ class Libc::Env_implementation : public Libc::Env
 
 		void close(Parent::Client::Id id) override {
 			return _env.close(id); }
+
+		/* already done by the libc */
+		void exec_static_constructors() override { }
 };
 
 
@@ -864,16 +867,30 @@ void Component::construct(Genode::Env &env)
 	Libc::init_dl(env);
 	Libc::sysctl_init(env);
 
+	kernel = unmanaged_singleton<Libc::Kernel>(env);
+
+	Libc::libc_config_init(kernel->libc_env().libc_config());
+
+	/*
+	 * XXX The following two steps leave us with the dilemma that we don't know
+	 * which linked library may depend on the successfull initialization of a
+	 * plugin. For example, some high-level library may try to open a network
+	 * connection in its constructor before the network-stack library is
+	 * initialized. But, we can't initialize plugins before calling static
+	 * constructors as those are needed to know about the libc plugin. The only
+	 * solution is to remove all libc plugins beside the VFS implementation,
+	 * which is our final goal anyway.
+	 */
+
+	/* finish static construction of component and libraries */
+	Libc::with_libc([&] () { env.exec_static_constructors(); });
+
 	/* initialize plugins that require Genode::Env */
 	auto init_plugin = [&] (Libc::Plugin &plugin) {
 		plugin.init(env);
 	};
 	Libc::plugin_registry()->for_each_plugin(init_plugin);
 
-	kernel = unmanaged_singleton<Libc::Kernel>(env);
-
-	Libc::libc_config_init(kernel->libc_env().libc_config());
-
 	/* construct libc component on kernel stack */
 	Libc::Component::construct(kernel->libc_env());
 }

repos/libports/src/server/acpi_input/main.cc

@@ -404,4 +404,10 @@ struct Transform::Main {
 };
 
 
-void Component::construct(Genode::Env &env) { static Transform::Main main(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Transform::Main main(env);
+}

repos/os/src/drivers/input/dummy/main.cc

@@ -26,23 +26,20 @@
 using namespace Genode;
 
 
-/*****************************************
- ** Implementation of the input service **
- *****************************************/
-
-/*
- * Input event buffer that is shared with the client
- */
-enum { MAX_EVENTS = 1000 };
-static Dataspace_capability ev_ds_cap;
-
 namespace Input {
 
 	class Session_component : public Genode::Rpc_object<Session>
 	{
+		private:
+
+			Dataspace_capability _ev_ds_cap;
+
 		public:
 
-			Dataspace_capability dataspace() override { return ev_ds_cap; }
+			Session_component(Dataspace_capability ev_ds_cap)
+			: _ev_ds_cap(ev_ds_cap) { }
+
+			Dataspace_capability dataspace() override { return _ev_ds_cap; }
 
 			bool pending() const override { return 0; }
 
@@ -60,36 +57,36 @@ namespace Input {
 	{
 		protected:
 
+			Dataspace_capability _ev_ds_cap;
+
 			Session_component *_create_session(const char *args) {
-				return new (md_alloc()) Session_component(); }
+				return new (md_alloc()) Session_component(_ev_ds_cap); }
 
 		public:
 
-			Root(Genode::Entrypoint &ep, Allocator &md_alloc)
-			: Root_component<Session_component>(ep, md_alloc) { }
+			Root(Genode::Entrypoint &ep, Allocator &md_alloc,
+			     Dataspace_capability ev_ds_cap)
+			:
+				Root_component<Session_component>(ep, md_alloc),
+				_ev_ds_cap(ev_ds_cap)
+			{ }
 	};
 }
 
 
 struct Main
 {
-	Genode::Sliced_heap heap;
+	Genode::Env &env;
 
-	Input::Root root;
+	Sliced_heap heap { env.ram(), env.rm() };
 
-	Main(Genode::Env &env)
-	:
-		heap(env.ram(), env.rm()),
-		root(env.ep(), heap)
+	Dataspace_capability ev_ds_cap {
+		env.ram().alloc(1000*sizeof(Input::Event)) };
+
+	Input::Root root { env.ep(), heap, ev_ds_cap };
+
+	Main(Genode::Env &env) : env(env)
 	{
-		/* create dataspace for event buffer that is shared with the client */
-		try { ev_ds_cap = env.ram().alloc(MAX_EVENTS*sizeof(Input::Event)); }
-		catch (Ram_session::Alloc_failed) {
-			Genode::error("could not allocate dataspace for event buffer");
-			throw Genode::Exception();
-		}
-
-		/* tell parent about the service */
 		env.parent().announce(env.ep().manage(root));
 	}
 };

repos/os/src/drivers/platform/spec/x86/main.cc

@@ -143,4 +143,10 @@ struct Platform::Main
 };
 
 
-void Component::construct(Genode::Env &env) { static Platform::Main main(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Platform::Main main(env);
+}

repos/os/src/server/blk_cache/main.cc

@@ -82,4 +82,10 @@ struct Main
 };
 
 
-void Component::construct(Genode::Env &env) { static Main server(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Main server(env);
+}

repos/os/src/server/iso9660/iso9660.cc

@@ -43,8 +43,6 @@ class Iso::Sector {
 			BLOCK_SIZE = 2048,
 		};
 
-		static Lock _lock;
-
 	private:
 
 		Block::Session::Tx::Source &_source;
@@ -56,8 +54,6 @@ class Iso::Sector {
 		       unsigned long blk_nr, unsigned long count)
 		: _source(*block.tx())
 		{
-			// Lock::Guard lock_guard(_lock);
-
 			try {
 				_p = Block::Packet_descriptor(
 					block.dma_alloc_packet(blk_size() * count),
@@ -81,7 +77,6 @@ class Iso::Sector {
 		}
 
 		~Sector() {
-			// Lock::Guard lock_guard(_lock);
 			_source.release_packet(_p);
 		}
 
@@ -98,12 +93,6 @@ class Iso::Sector {
 };
 
 
-/*
- * Static members of Sector
- */
-Lock Iso::Sector::_lock;
-
-
 /**
  * Rock ridge extension (see IEEE P1282)
  */

repos/os/src/server/nic_bridge/main.cc

@@ -65,4 +65,10 @@ struct Main
 };
 
 
-void Component::construct(Genode::Env &env) { static Main nic_bridge(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Main nic_bridge(env);
+}

repos/os/src/server/nic_dump/main.cc

@@ -55,4 +55,10 @@ Main::Main(Env &env)
 }
 
 
-void Component::construct(Env &env) { static Main main(env); }
+void Component::construct(Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Main main(env);
+}

repos/os/src/server/nic_router/main.cc

@@ -59,4 +59,10 @@ Main::Main(Env &env)
 }
 
 
-void Component::construct(Env &env) { static Main main(env); }
+void Component::construct(Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Main main(env);
+}

repos/os/src/server/nitpicker/main.cc

@@ -1394,4 +1394,10 @@ void Nitpicker::Main::handle_fb_mode()
 }
 
 
-void Component::construct(Genode::Env &env) { static Nitpicker::Main nitpicker(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Nitpicker::Main nitpicker(env);
+}

repos/os/src/test/blk/cli/main.cc

@@ -385,6 +385,9 @@ void perform(Genode::Env &env, Genode::Heap &heap, unsigned timeo_ms = 0)
 
 void Component::construct(Genode::Env &env)
 {
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
 	using namespace Genode;
 
 	try {

repos/ports/src/noux/net/net.cc

@@ -13,7 +13,6 @@
 
 
 /* Genode includes */
-#include <cap_session/connection.h>
 #include <dataspace/client.h>
 #include <base/lock.h>
 
@@ -39,19 +38,19 @@ void (*libc_select_notify)();
 	Socket_io_channel_backend *name = \
 	dynamic_cast<Socket_io_channel_backend*>(backend)
 
-static Genode::Lock _select_notify_lock;
-
 /**
  * This callback function is called from lwip via the libc_select_notify
  * function pointer if an event occurs.
  */
 static void select_notify()
 {
+	static Genode::Lock mutex;
+
 	/*
 	 * The function could be called multiple times while actually
 	 * still running.
 	 */
-	Genode::Lock::Guard guard(_select_notify_lock);
+	Genode::Lock::Guard guard(mutex);
 
 	for (Io_receptor *r = io_receptor_registry()->first();
 	     r != 0; r = r->next()) {

repos/ports/src/test/vbox_pointer/main.cc

@@ -185,4 +185,10 @@ struct Main
 };
 
 
-void Component::construct(Genode::Env &env) { static Main main(env); }
+void Component::construct(Genode::Env &env)
+{
+	/* XXX execute constructors of global statics */
+	env.exec_static_constructors();
+
+	static Main main(env);
+}