Index: usr.bin/du/tests/du_test.sh
===================================================================
--- usr.bin/du/tests/du_test.sh
+++ usr.bin/du/tests/du_test.sh
@@ -32,7 +32,10 @@
 A_flag_body()
 {
 	# XXX: compressed volumes?
-	atf_check truncate -s 10g sparse.file
+	if ! truncate -s 10g sparse.file; then
+		atf_skip "Unable to create 10GB sparse file (running on tmpfs?)"
+		rm -f sparse.file
+	fi
 	atf_check -o inline:'1\tsparse.file\n' du -g sparse.file
 	atf_check -o inline:'10\tsparse.file\n' du -A -g sparse.file
 }
@@ -106,7 +109,10 @@
 	atf_check truncate -s 1k A
 	atf_check truncate -s 1m B
 	atf_check truncate -s 1g C
-	atf_check truncate -s 1t D
+	if ! truncate -s 1t D; then
+		atf_skip "Unable to create 1T sparse file (running on tmpfs?)"
+		rm -f A B C D
+	fi
 	atf_check -o inline:'1\tA\n1\tB\n1\tC\n1024\tD\n' du -Ag A B C D
 }
 
@@ -120,7 +126,10 @@
 	atf_check truncate -s 1k A
 	atf_check truncate -s 1m B
 	atf_check truncate -s 1g C
-	atf_check truncate -s 1t D
+	if ! truncate -s 1t D; then
+		atf_skip "Unable to create 1T sparse file (running on tmpfs?)"
+		rm -f A B C D
+	fi
 	atf_check -o inline:'1.0K\tA\n1.0M\tB\n1.0G\tC\n1.0T\tD\n' du -Ah A B C D
 }