diff --git a/VKernel/Kernel/platform/pch/timer.vp b/VKernel/Kernel/platform/pch/timer.vp
index 9b45895..da8cd0e 100644
--- a/VKernel/Kernel/platform/pch/timer.vp
+++ b/VKernel/Kernel/platform/pch/timer.vp
@@ -1,6 +1,7 @@
 import platform.pch.pic as pic
 import platform.pch.pit as pit
 import sched.sched as sched
+import drivers.core.cpu.apic as apic
 import asm
 import t, c
 
@@ -27,6 +28,7 @@ def timer_handler():
     global ticks, seconds, milliseconds, timer_running
     if not timer_running:
         pic.eoi(0)
+        apic.eoi()
         return
     c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
     ticks = ticks + 1
@@ -37,6 +39,10 @@ def timer_handler():
     c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
     sched.Scheduler.sched_tick()
     pic.eoi(0)
+    # LAPIC EOI：APIC 启用后中断经 LINT0(EXTINT) 送达会置 LAPIC ISR，
+    # 只发 PIC EOI 不清 LAPIC ISR → 首个定时中断后后续中断被屏蔽 →
+    # ticks 不推进 → msleep 永久挂起（QEMU/OVMF 下 APIC 必启用）。
+    apic.eoi()
 
 def timer_start():
     global timer_running