diff --git a/kernel/ap.c b/kernel/ap.c
index 72c4bcce..cf9dce13 100644
--- a/kernel/ap.c
+++ b/kernel/ap.c
@@ -3,6 +3,7 @@
 #include <aal/cpu.h>
 #include <aal/mm.h>
 #include <aal/debug.h>
+#include <process.h>
 
 int num_processors = 1;
 static volatile int ap_stop = 1;
@@ -20,8 +21,12 @@ static void ap_wait(void)
 		barrier();
 		cpu_pause();
 	}
+	kprintf("ap started.\n");
+	kmalloc_init();
+	sched_init();
+	init_host_syscall_channel();
 
-	ap_idle();
+	schedule();
 }
 
 void ap_start(void)
diff --git a/kernel/host.c b/kernel/host.c
index f1a6d294..6d959e5e 100644
--- a/kernel/host.c
+++ b/kernel/host.c
@@ -142,7 +142,7 @@ static void process_msg_init_acked(unsigned long pphys)
 
 	lparam->post_fin = 1;
 
-	kprintf("Syscall parameters:\n");
+	kprintf("Syscall parameters: (%d)\n", aal_mc_get_processor_id());
 	kprintf(" Response: %lx, %p\n",
 	        lparam->response_pa, lparam->response_va);
 	kprintf(" Request : %lx, %lx, %p\n",
diff --git a/kernel/init.c b/kernel/init.c
index 0dea6448..ec7a8f0d 100644
--- a/kernel/init.c
+++ b/kernel/init.c
@@ -114,7 +114,6 @@ static void rest_init(void)
 	mc_ikc_init();
 
 	sched_init();
-	ap_start();
 }
 
 int host_ikc_inited = 0;
@@ -129,6 +128,7 @@ static void post_init(void)
 	}
 
 	init_host_syscall_channel();
+	ap_start();
 }
 
 int main(void)
diff --git a/kernel/process.c b/kernel/process.c
index c49fe672..4694064c 100644
--- a/kernel/process.c
+++ b/kernel/process.c
@@ -221,7 +221,7 @@ void schedule(void)
 
 	if (switch_ctx) {
 		kprintf("schedule: %p (%p) => %p (%p) \n", prev, 
-		        prev->page_table, next, next->page_table);
+		        prev ? prev->page_table : NULL, next, next->page_table);
 		aal_mc_load_page_table(next->page_table);
 
 		if (prev) {
diff --git a/kernel/syscall.c b/kernel/syscall.c
index c4ddcd71..15b96978 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -21,6 +21,10 @@ static void send_syscall(struct syscall_request *req)
 
 	res->status = 0;
 
+	kprintf("CPU : %lx\n", aal_mc_get_processor_id());
+	kprintf("Target is %lx\n", cpu_local_var(scp).request_pa);
+	kprintf("SC req: %ld %ld %ld\n", req->valid, req->number, req->args[0]);
+
 	memcpy_async(cpu_local_var(scp).request_pa,
 	             virt_to_phys(req), sizeof(*req), 0, &fin);
 
@@ -249,7 +253,7 @@ long sys_uname(int n, aal_mc_user_context_t *ctx)
 	request.number = n;
 	request.args[0] = phys;
 
-	return do_syscall(&request);
+	return do_syscall(&request), stop();
 }
 
 long sys_getxid(int n, aal_mc_user_context_t *ctx)
@@ -311,6 +315,14 @@ long syscall(int num, aal_mc_user_context_t *ctx)
 
 	cpu_enable_interrupt();
 
+	kprintf("SC(%d)[%3d](%lx, %lx, %lx, %lx, %lx) @ %lx | %lx\n", 
+	        aal_mc_get_processor_id(),
+	        num,
+	        aal_mc_syscall_arg0(ctx), aal_mc_syscall_arg1(ctx),
+	        aal_mc_syscall_arg2(ctx), aal_mc_syscall_arg3(ctx),
+	        aal_mc_syscall_arg4(ctx), aal_mc_syscall_pc(ctx),
+	        aal_mc_syscall_sp(ctx));
+
 	if (syscall_table[num]) {
 		l = syscall_table[num](num, ctx);
 		return l;
diff --git a/linux/mod_mcctrl/control.c b/linux/mod_mcctrl/control.c
index 98c08e8e..63504f98 100644
--- a/linux/mod_mcctrl/control.c
+++ b/linux/mod_mcctrl/control.c
@@ -166,6 +166,11 @@ int mcexec_wait_syscall(aal_os_t os, struct syscall_wait_desc *__user req)
 			}
 		}
 		*c->param.doorbell_va = 0;
+		printk("(%p) %ld SC %ld: %lx\n", 
+		       c->param.request_va,
+		       c->param.request_va->valid,
+		       c->param.request_va->number,
+		       c->param.request_va->args[0]);
 		if (__do_in_kernel_syscall(os, c, c->param.request_va)) {
 #endif
 			if (copy_to_user(&req->sr, c->param.request_va,