From f801496427db11cc468065dcd77d1c610c0a1047 Mon Sep 17 00:00:00 2001
From: "Brian C. Lane" <bcl@redhat.com>
Date: Mon, 14 Jun 2021 14:23:46 -0700
Subject: [PATCH 14/15] tests: t0400 - Work around a mkswap bug by using
 /dev/zero

mkswap gets stuck, in some situations, when operating on a file full of
holes (see https://bugzilla.redhat.com/show_bug.cgi?id=1971877) so work
around that by using /dev/zero instead of /dev/null
---
 tests/t0400-loop-clobber-infloop.sh | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tests/t0400-loop-clobber-infloop.sh b/tests/t0400-loop-clobber-infloop.sh
index 2d2190d..d05a8e0 100644
--- a/tests/t0400-loop-clobber-infloop.sh
+++ b/tests/t0400-loop-clobber-infloop.sh
@@ -22,7 +22,12 @@
 
 N=1M
 dev=loop-file
-dd if=/dev/null of=$dev bs=1 seek=$N || fail=1
+
+cleanup_() {
+    rm -f $dev;
+}
+
+dd if=/dev/zero of=$dev bs=$N count=1 || fail=1
 
 mkswap $dev || fail=1
 
-- 
2.31.1