diff -u linux-2.6.18-408.el5.028stab120.1-owl/kernel/ptrace.c linux-2.6.18-408.el5.028stab120.1-owl/kernel/ptrace.c
--- linux-2.6.18-408.el5.028stab120.1-owl/kernel/ptrace.c	2016-08-23 15:41:27 +0000
+++ linux-2.6.18-408.el5.028stab120.1-owl/kernel/ptrace.c	2016-10-23 19:55:50 +0000
@@ -41,7 +41,7 @@
 	struct page *page;
 	void *old_buf = buf;
 
-	down_read(&mm->mmap_sem);
+	down_write(&mm->mmap_sem);
 	/* ignore errors, just check how much was sucessfully transfered */
 	while (len) {
 		int bytes, ret, offset;
@@ -72,7 +72,7 @@
 		buf += bytes;
 		addr += bytes;
 	}
-	up_read(&mm->mmap_sem);
+	up_write(&mm->mmap_sem);
 	
 	return buf - old_buf;
 }
--- linux-2.6.18-408.el5.028stab120.1/mm/madvise.c	2016-01-25 08:11:41 +0000
+++ linux-2.6.18-408.el5.028stab120.1-owl/mm/madvise.c	2016-10-23 19:56:21 +0000
@@ -23,7 +23,6 @@ static int madvise_need_mmap_write(int b
 	switch (behavior) {
 	case MADV_REMOVE:
 	case MADV_WILLNEED:
-	case MADV_DONTNEED:
 	case MADV_DEACTIVATE:
 		return 0;
 	default: