diff --git a/helpers/DATA/util-linux/lsfd--fix-2399-use-fifo-in-test-cases.patch b/helpers/DATA/util-linux/lsfd--fix-2399-use-fifo-in-test-cases.patch
new file mode 100644
index 0000000..666f88b
--- /dev/null
+++ b/helpers/DATA/util-linux/lsfd--fix-2399-use-fifo-in-test-cases.patch
@@ -0,0 +1,93 @@
+diff --git a/tests/ts/lsfd/option-inet b/tests/ts/lsfd/option-inet_
+old mode 100755
+new mode 100644
+index 011a9b3a..b0910f23
+--- a/tests/ts/lsfd/option-inet
++++ b/tests/ts/lsfd/option-inet_
+@@ -25,23 +25,54 @@ ts_skip_docker
+ ts_check_test_command "$TS_CMD_LSFD"
+ ts_check_test_command "$TS_HELPER_MKFDS"
+ 
++ts_check_prog "mkfifo"
++
+ ts_cd "$TS_OUTDIR"
+ 
++FIFO=./test_mkfds-option-inet.fifo
+ {
+-    "$TS_HELPER_MKFDS" -q tcp  3 4 5 server-port=34567 client-port=23456 &
+-    PID0=$!
+-
+-    "$TS_HELPER_MKFDS" -q tcp6 3 4 5 server-port=34567 client-port=23456 &
+-    PID1=$!
+-
+-    "$TS_HELPER_MKFDS" -q ro-regular-file 3 file=/etc/passwd &
+-    PID2=$!
+-
+-    "$TS_HELPER_MKFDS" -q udp 3 4 server-port=34567 client-port=23456 server-do-bind=1 client-do-bind=1 client-do-connect=1&
+-    PID3=$!
+-
+-    "$TS_HELPER_MKFDS" -q udp6 3 4 lite=1 server-port=34567 client-port=23456 server-do-bind=1 client-do-bind=1 client-do-connect=1&
+-    PID4=$!
++    rm -f "${FIFO}"
++    if ! mkfifo "${FIFO}"; then
++	ts_finalize  "failed in creating a fifo"
++    fi
++
++    "$TS_HELPER_MKFDS" tcp  3 4 5 server-port=34567 client-port=23456 > "${FIFO}" &
++    if ! read PID0 < "${FIFO}"; then
++	rm "${FIFO}"
++	ts_finalize  "$TS_HELPER_MKFDS tcp...doesn't report its pid"
++    fi
++
++    "$TS_HELPER_MKFDS" tcp6 3 4 5 server-port=34567 client-port=23456 > "${FIFO}" &
++    if ! read PID1  < "${FIFO}"; then
++	kill -CONT "${PID0}"
++	wait       "${PID0}"
++	rm "${FIFO}"
++	ts_finalize  "$TS_HELPER_MKFDS tcp6...doesn't report its pid"
++    fi
++
++    "$TS_HELPER_MKFDS" ro-regular-file 3 file=/etc/passwd > "${FIFO}" &
++    if ! read PID2  < "${FIFO}"; then
++	kill -CONT "${PID0}" "${PID1}"
++	wait       "${PID0}" "${PID1}"
++	rm "${FIFO}"
++	ts_finalize  "$TS_HELPER_MKFDS ro-regular-file...doesn't report its pid"
++    fi
++
++    "$TS_HELPER_MKFDS" udp 3 4 server-port=34567 client-port=23456 server-do-bind=1 client-do-bind=1 client-do-connect=1 > "${FIFO}" &
++    if ! read PID3  < "${FIFO}"; then
++	kill -CONT "${PID0}" "${PID1}" "${PID2}"
++	wait       "${PID0}" "${PID1}" "${PID2}"
++	rm "${FIFO}"
++	ts_finalize  "$TS_HELPER_MKFDS udp...doesn't report its pid"
++    fi
++
++    "$TS_HELPER_MKFDS" udp6 3 4 lite=1 server-port=34567 client-port=23456 server-do-bind=1 client-do-bind=1 client-do-connect=1 > "${FIFO}" &
++    if ! read PID4  < "${FIFO}"; then
++	kill -CONT "${PID0}" "${PID1}" "${PID2}" "${PID3}"
++	wait       "${PID0}" "${PID1}" "${PID2}" "${PID3}"
++	rm "${FIFO}"
++	ts_finalize  "$TS_HELPER_MKFDS udp6 lite=1...doesn't report its pid"
++    fi
+ 
+     OPT='--inet'
+     echo "# $OPT"
+@@ -85,14 +116,9 @@ ts_cd "$TS_OUTDIR"
+ 		   -o ASSOC,TYPE,NAME \
+ 		   -Q "(PID == $PID0) or (PID == $PID1) or (PID == $PID2) or (PID == $PID3) or (PID == $PID4)"
+ 
+-    kill -CONT "${PID0}"
+-    wait "${PID0}"
+-
+-    kill -CONT "${PID1}"
+-    wait "${PID1}"
+-
+-    kill -CONT "${PID2}"
+-    wait "${PID2}"
++    kill -CONT "${PID0}" "${PID1}" "${PID2}" "${PID3}" "${PID4}"
++    wait       "${PID0}" "${PID1}" "${PID2}" "${PID3}" "${PID4}"
++    rm "${FIFO}"
+ } > "$TS_OUTPUT" 2>&1
+ 
+ ts_finalize
diff --git a/helpers/DATA/util-linux/tests-mark-fadvise-drop-as-known-failing-on-buildds.patch b/helpers/DATA/util-linux/tests-mark-fadvise-drop-as-known-failing-on-buildds.patch
new file mode 100644
index 0000000..f61bf60
--- /dev/null
+++ b/helpers/DATA/util-linux/tests-mark-fadvise-drop-as-known-failing-on-buildds.patch
@@ -0,0 +1,23 @@
+From: Chris Hofstaedtler <zeha@debian.org>
+Date: Tue, 2 Apr 2024 21:52:47 +0200
+Subject: tests: mark fadvise/drop as known failing on buildds
+
+buildds build on a tmpfs, but this is not visible inside the build environment.
+---
+ tests/ts/fadvise/drop | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/tests/ts/fadvise/drop b/tests/ts/fadvise/drop
+index 45dcb91..c01e16c 100755
+--- a/tests/ts/fadvise/drop
++++ b/tests/ts/fadvise/drop
+@@ -6,6 +6,9 @@ TS_DESC="drop page caches related to a file"
+ . "$TS_TOPDIR"/functions.sh
+ ts_init "$*"
+ 
++# fails on Debian buildds, because the buildds use tmpfs hidden behind an unshare namespace.
++TS_KNOWN_FAIL="yes"
++
+ ts_check_test_command "$TS_CMD_FADVISE"
+ ts_check_test_command "$TS_CMD_FINCORE"
+ ts_check_test_command "$TS_CMD_FINDMNT"
diff --git a/helpers/make-util-linux b/helpers/make-util-linux
index 60f8636..796da99 100644
--- a/helpers/make-util-linux
+++ b/helpers/make-util-linux
@@ -25,10 +25,15 @@
 
 #STAGE-4-UDEBS || #STAGE-1-DEBOOTSTRAP
 
-VERSION=0
+VERSION=1
 NETINST=true
 . ./config
 
+# Fix FTBFS when rebuild at Ecne.
+# - lsfd/option-inet
+patch_p1 $DATA/lsfd--fix-2399-use-fifo-in-test-cases.patch
+# - fadvise/drop
+patch_p1 $DATA/tests-mark-fadvise-drop-as-known-failing-on-buildds.patch
 
 changelog "Rebuild upstream to get udeb dependency for debian-installer."
 package