diff --git a/shared-scheduler/src/main.rs b/shared-scheduler/src/main.rs
index 5b5cebb..4ebd576 100644
--- a/shared-scheduler/src/main.rs
+++ b/shared-scheduler/src/main.rs
@@ -41,6 +41,7 @@ pub fn panic_handler(panic_info: &core::panic::PanicInfo) -> ! {
     } else {
         syscall::sys_panic(None, 0, 0, err);
     }
+    // println!("[shared scheduler] panic: {:?}", panic_info);
     unreachable!()
 }
 
diff --git a/tornado-kernel/src/task/executor.rs b/tornado-kernel/src/task/executor.rs
index 10e22ea..d115e68 100644
--- a/tornado-kernel/src/task/executor.rs
+++ b/tornado-kernel/src/task/executor.rs
@@ -14,11 +14,15 @@ pub fn run_until_idle(
     set_task_state: impl Fn(usize, TaskState),
 ) {
     loop {
+        unsafe { riscv::register::sie::clear_sext(); }
         let task = peek_task();
+        unsafe { riscv::register::sie::set_sext(); }
         println!(">>> kernel executor: next task = {:x?}", task);
         match task {
             TaskResult::Task(task_repr) => { // 在相同的（内核）地址空间里面
+                unsafe { riscv::register::sie::clear_sext(); }
                 set_task_state(task_repr, TaskState::Sleeping);
+                unsafe { riscv::register::sie::set_sext(); }
                 let task: Arc<KernelTaskRepr> = unsafe { Arc::from_raw(task_repr as *mut _) };
                 let waker = waker_ref(&task);
                 let mut context = Context::from_waker(&*waker);
@@ -26,7 +30,9 @@ pub fn run_until_idle(
                 if let Poll::Pending = ret {
                     mem::forget(task); // 不要释放task的内存，它将继续保存在内存中被使用
                 } else { // 否则，释放task的内存
+                    unsafe { riscv::register::sie::clear_sext(); }
                     delete_task(task_repr);
+                    unsafe { riscv::register::sie::set_sext(); }
                 } // 隐含一个drop(task)
             },
             TaskResult::ShouldYield(next_asid) => {
diff --git a/tornado-kernel/src/trap/handler.rs b/tornado-kernel/src/trap/handler.rs
index 54e6cde..ea298bc 100644
--- a/tornado-kernel/src/trap/handler.rs
+++ b/tornado-kernel/src/trap/handler.rs
@@ -253,15 +253,16 @@ pub unsafe extern "C" fn rust_supervisor_external(trap_frame: &mut TrapFrame) ->
         // virtio 外部中断
         println!("virtio external interrupt! irq: {}", irq);
         // 获得数据传输完成的块号，后面需要通过这个去唤醒相应的任务
-        let intr_ret = crate::virtio::BLOCK_DEVICE.handle_interrupt();
+        // let intr_ret = crate::virtio::BLOCK_DEVICE.handle_interrupt();
         let t = crate::VIRTIO_TASK.lock();
-        let task: Arc<KernelTaskRepr> = Arc::from_raw(t[0] as *mut _); 
+        let task: Arc<KernelTaskRepr> = Arc::from_raw(t[0] as *mut _);
         crate::task::KernelTaskRepr::do_wake(&task);
         core::mem::forget(task);
         // 释放锁
         drop(t);
         // 通知 PLIC 外部中断已经处理完
         crate::plic::plic_complete(irq);
+        crate::virtio::BLOCK_DEVICE.0.ack_interrupt();
         trap_frame
     } else {
         panic!("unknown S mode external interrupt! irq: {}", irq);
diff --git a/tornado-kernel/src/virtio/async_blk.rs b/tornado-kernel/src/virtio/async_blk.rs
index 0490407..2efabef 100644
--- a/tornado-kernel/src/virtio/async_blk.rs
+++ b/tornado-kernel/src/virtio/async_blk.rs
@@ -44,8 +44,7 @@ impl VirtIOAsyncBlock {
                 return sector;
             }
             _other => {
-                // panic!("virtio handle inerrupt error!");
-                return 0;
+                panic!("virtio handle inerrupt error!");
             }
         }
     }
diff --git a/tornado-kernel/src/virtio/mod.rs b/tornado-kernel/src/virtio/mod.rs
index 2d91804..240361c 100644
--- a/tornado-kernel/src/virtio/mod.rs
+++ b/tornado-kernel/src/virtio/mod.rs
@@ -35,6 +35,7 @@ pub extern "C" fn virtio_dma_alloc(pages: usize) -> PhysicalAddress {
     PhysicalPageNumber::from(ppn_base).start_address()
 }
 
+// todo: 这里有 bug
 #[no_mangle]
 pub extern "C" fn virtio_dma_dealloc(pa: PhysicalAddress, pages: usize) -> i32 {
     let ppn = PhysicalPageNumber::floor(pa);