diff --git a/t/t3302-notes-index-expensive.sh b/t/t3302-notes-index-expensive.sh
index bc9d8ee1e6..bb5fea02a0 100755
--- a/t/t3302-notes-index-expensive.sh
+++ b/t/t3302-notes-index-expensive.sh
@@ -8,7 +8,6 @@ test_description='Test commit notes index (expensive!)'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
-TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 create_repo () {
@@ -65,7 +64,8 @@ create_repo () {
 test_notes () {
 	count=$1 &&
 	git config core.notesRef refs/notes/commits &&
-	git log | grep "^    " >output &&
+	git log >tmp &&
+	grep "^    " tmp >output &&
 	i=$count &&
 	while test $i -gt 0
 	do
@@ -90,7 +90,7 @@ write_script time_notes <<\EOF
 			unset GIT_NOTES_REF
 			;;
 		esac
-		git log
+		git log || exit $?
 		i=$(($i+1))
 	done >/dev/null
 EOF
diff --git a/t/t3303-notes-subtrees.sh b/t/t3303-notes-subtrees.sh
index 7e0a8960af..eac193757b 100755
--- a/t/t3303-notes-subtrees.sh
+++ b/t/t3303-notes-subtrees.sh
@@ -5,7 +5,6 @@ test_description='Test commit notes organized in subtrees'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
-TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 number_of_commits=100
@@ -79,7 +78,7 @@ test_sha1_based () {
 	(
 		start_note_commit &&
 		nr=$number_of_commits &&
-		git rev-list refs/heads/main |
+		git rev-list refs/heads/main >out &&
 		while read sha1; do
 			note_path=$(echo "$sha1" | sed "$1")
 			cat <<INPUT_END &&
@@ -91,9 +90,9 @@ EOF
 INPUT_END
 
 			nr=$(($nr-1))
-		done
-	) |
-	git fast-import --quiet
+		done <out
+	) >gfi &&
+	git fast-import --quiet <gfi
 }
 
 test_expect_success 'test notes in 2/38-fanout' 'test_sha1_based "s|^..|&/|"'
diff --git a/t/t3305-notes-fanout.sh b/t/t3305-notes-fanout.sh
index 1f5964865a..9976d787f4 100755
--- a/t/t3305-notes-fanout.sh
+++ b/t/t3305-notes-fanout.sh
@@ -2,7 +2,6 @@
 
 test_description='Test that adding/removing many notes triggers automatic fanout restructuring'
 
-TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 path_has_fanout() {
@@ -24,7 +23,7 @@ touched_one_note_with_fanout() {
 all_notes_have_fanout() {
 	notes_commit=$1 &&
 	fanout=$2 &&
-	git ls-tree -r --name-only $notes_commit 2>/dev/null |
+	git ls-tree -r --name-only $notes_commit |
 	while read path
 	do
 		path_has_fanout $path $fanout || return 1
@@ -51,8 +50,9 @@ test_expect_success 'creating many notes with git-notes' '
 	done
 '
 
-test_expect_success 'many notes created correctly with git-notes' '
-	git log | grep "^    " > output &&
+test_expect_success !SANITIZE_LEAK 'many notes created correctly with git-notes' '
+	git log >output.raw &&
+	grep "^    " output.raw >output &&
 	i=$num_notes &&
 	while test $i -gt 0
 	do
@@ -91,13 +91,13 @@ test_expect_success 'stable fanout 0 is followed by stable fanout 1' '
 test_expect_success 'deleting most notes with git-notes' '
 	remove_notes=285 &&
 	i=0 &&
-	git rev-list HEAD |
+	git rev-list HEAD >revs &&
 	while test $i -lt $remove_notes && read sha1
 	do
 		i=$(($i + 1)) &&
 		test_tick &&
-		git notes remove "$sha1" 2>/dev/null || return 1
-	done
+		git notes remove "$sha1" || return 1
+	done <revs
 '
 
 test_expect_success 'most notes deleted correctly with git-notes' '