From e822fc47dde18b8e61e7b1b0591f43941e821cc9 Mon Sep 17 00:00:00 2001
From: Tomoki Shirasawa <sira@popeye.cc.u-tokyo.ac.jp>
Date: Wed, 11 Nov 2015 23:03:43 +0900
Subject: [PATCH] fix dead locking when kill subthreads

---
 kernel/syscall.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/syscall.c b/kernel/syscall.c
index 964f6b4a..52c52ae6 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -598,6 +598,7 @@ terminate(int rc, int sig)
 			}
 		}
 	}
+	mcs_rwlock_reader_unlock(&proc->threads_lock, &lock);
 	if(ids){
 		for(i = 0; i < n; i++){
 			do_kill(mythread, proc->pid, ids[i], SIGKILL, NULL, 0);
@@ -605,7 +606,6 @@ terminate(int rc, int sig)
 		kfree(ids);
 		ids = NULL;
 	}
-	mcs_rwlock_reader_unlock(&proc->threads_lock, &lock);
 
 	for(;;){
 		__mcs_rwlock_reader_lock(&proc->threads_lock, &lock);