From d7ccea8f1889654d75f9dc3d863887447cb22530 Mon Sep 17 00:00:00 2001
From: Xuewei Niu <justxuewei@apache.org>
Date: Wed, 19 Oct 2022 17:25:09 +0800
Subject: [PATCH] fix(os): fix kstack leak issues

The kstack_id is not recycled when KernelStack is dropped, which leads to kstack
leak issue. Ch8 branch, and branches after that, are also affected by this
issue.

Signed-off-by: Xuewei Niu <justxuewei@apache.org>
---
 os/src/task/id.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/os/src/task/id.rs b/os/src/task/id.rs
index c1771813..23ddf7b5 100644
--- a/os/src/task/id.rs
+++ b/os/src/task/id.rs
@@ -87,6 +87,7 @@ impl Drop for KernelStack {
         KERNEL_SPACE
             .exclusive_access()
             .remove_area_with_start_vpn(kernel_stack_bottom_va.into());
+        KSTACK_ALLOCATOR.exclusive_access().dealloc(self.0);
     }
 }