diff -Naur linux-4.4.6.ORIG/fs/btrfs/ctree.c linux-4.4.6/fs/btrfs/ctree.c
--- linux-4.4.6.ORIG/fs/btrfs/ctree.c	2016-01-10 13:01:32.000000000 -1000
+++ linux-4.4.6/fs/btrfs/ctree.c	2016-03-30 06:19:16.397973820 -1000
@@ -20,6 +20,7 @@
 #include <linux/slab.h>
 #include <linux/rbtree.h>
 #include "ctree.h"
+#include <linux/vmalloc.h>
 #include "disk-io.h"
 #include "transaction.h"
 #include "print-tree.h"
@@ -5362,10 +5363,13 @@
 		goto out;
 	}
 
-	tmp_buf = kmalloc(left_root->nodesize, GFP_NOFS);
+	tmp_buf = kmalloc(left_root->nodesize, GFP_KERNEL | __GFP_NOWARN);
 	if (!tmp_buf) {
-		ret = -ENOMEM;
-		goto out;
+      tmp_buf = vmalloc(left_root->nodesize);
+      if (!tmp_buf) {
+		   ret = -ENOMEM;
+   		goto out;
+      }
 	}
 
 	left_path->search_commit_root = 1;
@@ -5566,7 +5570,7 @@
 out:
 	btrfs_free_path(left_path);
 	btrfs_free_path(right_path);
-	kfree(tmp_buf);
+	kvfree(tmp_buf);
 	return ret;
 }