From ed6d94a358dbbdedba1502d236d0ddff2a7be977 Mon Sep 17 00:00:00 2001
From: Tomoki Shirasawa <sira@popeye.cc.u-tokyo.ac.jp>
Date: Wed, 11 Mar 2015 16:08:26 +0900
Subject: [PATCH] syscall slowdown when repeat fork/exit/wait (LTP fork13)

---
 executer/kernel/control.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/executer/kernel/control.c b/executer/kernel/control.c
index ddbcdb28..2288a6b5 100644
--- a/executer/kernel/control.c
+++ b/executer/kernel/control.c
@@ -491,14 +491,15 @@ retry_alloc:
 
 	ret = wait_event_interruptible(wqhln->wq_syscall, wqhln->req);
 	
-	if (ret) {
-		return -EINTR;
-	}
 
 	/* Remove per-process wait queue head */
 	irqflags = ihk_ikc_spinlock_lock(&c->wq_list_lock);
 	list_del(&wqhln->list);
 	ihk_ikc_spinlock_unlock(&c->wq_list_lock, irqflags);
+	if (ret) {
+		kfree(wqhln);
+		return -EINTR;
+	}
 	kfree(wqhln);
 
 	if (c->param.request_va->number == 61 &&