diff --git a/arch/arm/arm/src/los_hw.c b/arch/arm/arm/src/los_hw.c
index 2db15a42..2c9584b9 100644
--- a/arch/arm/arm/src/los_hw.c
+++ b/arch/arm/arm/src/los_hw.c
@@ -105,7 +105,15 @@ LITE_OS_SEC_TEXT_INIT VOID *OsTaskStackInit(UINT32 taskID, UINT32 stackSize, VOI
 
 LITE_OS_SEC_TEXT VOID OsUserCloneParentStack(VOID *childStack, UINTPTR parentTopOfStack, UINT32 parentStackSize)
 {
-    VOID *cloneStack = (VOID *)(((UINTPTR)parentTopOfStack + parentStackSize) - sizeof(TaskContext));
+    LosTaskCB *task = OsCurrTaskGet();
+    sig_cb *sigcb = &task->sig;
+    VOID *cloneStack = NULL;
+
+    if (sigcb->sigContext != NULL) {
+        cloneStack = (VOID *)((UINTPTR)sigcb->sigContext - sizeof(TaskContext));
+    } else {
+        cloneStack = (VOID *)(((UINTPTR)parentTopOfStack + parentStackSize) - sizeof(TaskContext));
+    }
 
     (VOID)memcpy_s(childStack, sizeof(TaskContext), cloneStack, sizeof(TaskContext));
     ((TaskContext *)childStack)->R0 = 0;
diff --git a/kernel/base/ipc/los_signal.c b/kernel/base/ipc/los_signal.c
index 43285ad4..ec7c5d59 100644
--- a/kernel/base/ipc/los_signal.c
+++ b/kernel/base/ipc/los_signal.c
@@ -678,6 +678,7 @@ VOID *OsRestorSignalContext(VOID *sp)
 
     LosProcessCB *process = OsCurrProcessGet();
     VOID *saveContext = sigcb->sigContext;
+    sigcb->sigContext = NULL;
     sigcb->count--;
     process->sigShare = 0;
     OsProcessExitCodeSignalClear(process);