diff --git a/kernel/src/ipc/semaphore/system_v/sem.rs b/kernel/src/ipc/semaphore/system_v/sem.rs
index 53e6efd34..765f03c65 100644
--- a/kernel/src/ipc/semaphore/system_v/sem.rs
+++ b/kernel/src/ipc/semaphore/system_v/sem.rs
@@ -99,14 +99,14 @@ pub struct Semaphore {
 }
 
 impl Semaphore {
-    pub fn set_val(&self, val: i32) -> Result<()> {
+    pub fn set_val(&self, val: i32, current_pid: Pid) -> Result<()> {
         if !(0..SEMVMX).contains(&val) {
             return_errno!(Errno::ERANGE);
         }
 
         let mut current_val = self.val.lock();
         *current_val = val;
-        *self.latest_modified_pid.write() = current!().pid();
+        *self.latest_modified_pid.write() = current_pid;
 
         self.update_pending_ops(current_val);
         Ok(())
@@ -166,9 +166,10 @@ impl Semaphore {
         );
     }
 
-    fn sem_op(&self, sem_buf: SemBuf, timeout: Option<Duration>) -> Result<()> {
+    fn sem_op(&self, sem_buf: SemBuf, timeout: Option<Duration>, ctx: &Context) -> Result<()> {
         let mut val = self.val.lock();
         let sem_op = sem_buf.sem_op;
+        let current_pid = ctx.process.pid();
 
         let flags = IpcFlags::from_bits(sem_buf.sem_flags as u32).unwrap();
         if flags.contains(IpcFlags::SEM_UNDO) {
@@ -189,7 +190,7 @@ impl Semaphore {
             }
 
             *val = new_val;
-            *self.latest_modified_pid.write() = current!().pid();
+            *self.latest_modified_pid.write() = current_pid;
             self.update_otime();
 
             self.update_pending_ops(val);
@@ -206,14 +207,12 @@ impl Semaphore {
         // Add current to pending list
         let (waiter, waker) = Waiter::new_pair();
         let status = Arc::new(AtomicStatus::new(Status::Pending));
-        let current = current!();
-        let pid = current.pid();
         let pending_op = Box::new(PendingOp {
             sem_buf,
             status: status.clone(),
             waker: waker.clone(),
-            process: Arc::downgrade(&current),
-            pid,
+            process: ctx.posix_thread.weak_process(),
+            pid: current_pid,
         });
         if sem_op == 0 {
             self.pending_const.lock().push_back(pending_op);
@@ -241,7 +240,7 @@ impl Semaphore {
                 } else {
                     self.pending_alters.lock()
                 };
-                pending_ops.retain(|op| op.pid != pid);
+                pending_ops.retain(|op| op.pid != current_pid);
                 Err(Error::new(Errno::EAGAIN))
             }
         }
@@ -302,7 +301,12 @@ impl Semaphore {
     }
 }
 
-pub fn sem_op(sem_id: key_t, sem_buf: SemBuf, timeout: Option<Duration>) -> Result<()> {
+pub fn sem_op(
+    sem_id: key_t,
+    sem_buf: SemBuf,
+    timeout: Option<Duration>,
+    ctx: &Context,
+) -> Result<()> {
     debug_assert!(sem_id > 0);
     debug!("[semop] sembuf: {:?}", sem_buf);
 
@@ -318,5 +322,5 @@ pub fn sem_op(sem_id: key_t, sem_buf: SemBuf, timeout: Option<Duration>) -> Resu
             .clone()
     };
 
-    sem.sem_op(sem_buf, timeout)
+    sem.sem_op(sem_buf, timeout, ctx)
 }
diff --git a/kernel/src/syscall/semctl.rs b/kernel/src/syscall/semctl.rs
index 621570519..b399f8f58 100644
--- a/kernel/src/syscall/semctl.rs
+++ b/kernel/src/syscall/semctl.rs
@@ -58,7 +58,7 @@ pub fn sys_semctl(
                     .get(semnum as usize)
                     .ok_or(Error::new(Errno::EINVAL))?;
 
-                sem.set_val(val)?;
+                sem.set_val(val, ctx.process.pid())?;
                 sem_set.update_ctime();
 
                 Ok(())
diff --git a/kernel/src/syscall/semop.rs b/kernel/src/syscall/semop.rs
index 81115ec21..f8c97b083 100644
--- a/kernel/src/syscall/semop.rs
+++ b/kernel/src/syscall/semop.rs
@@ -13,12 +13,12 @@ use crate::{
     time::timespec_t,
 };
 
-pub fn sys_semop(sem_id: i32, tsops: Vaddr, nsops: usize, _ctx: &Context) -> Result<SyscallReturn> {
+pub fn sys_semop(sem_id: i32, tsops: Vaddr, nsops: usize, ctx: &Context) -> Result<SyscallReturn> {
     debug!(
         "[sys_semop] sem_id = {:?}, tsops_vaddr = {:x?}, nsops = {:?}",
         sem_id, tsops, nsops
     );
-    do_sys_semtimedop(sem_id, tsops, nsops, None)
+    do_sys_semtimedop(sem_id, tsops, nsops, None, ctx)
 }
 
 pub fn sys_semtimedop(
@@ -41,7 +41,7 @@ pub fn sys_semtimedop(
         )?)
     };
 
-    do_sys_semtimedop(sem_id, tsops, nsops, timeout)
+    do_sys_semtimedop(sem_id, tsops, nsops, timeout, ctx)
 }
 
 fn do_sys_semtimedop(
@@ -49,6 +49,7 @@ fn do_sys_semtimedop(
     tsops: Vaddr,
     nsops: usize,
     timeout: Option<Duration>,
+    ctx: &Context,
 ) -> Result<SyscallReturn> {
     if sem_id <= 0 || nsops == 0 {
         return_errno!(Errno::EINVAL);
@@ -64,7 +65,7 @@ fn do_sys_semtimedop(
             check_sem(sem_id, None, PermissionMode::ALTER)?;
         }
 
-        sem_op(sem_id, sem_buf, timeout)?;
+        sem_op(sem_id, sem_buf, timeout, ctx)?;
     }
 
     Ok(SyscallReturn::Return(0))