one-file-system.log ( failed)

FAIL: tests/rm/one-file-system
==============================

--- exp	2024-10-20 16:07:07.993809041 +0000
+++ out	2024-10-20 16:07:07.996809045 +0000
@@ -1 +1 @@
-rm: skipping 'a/b', since it's on a different device
+rm: cannot remove 'a': Device or resource busy (os error 16)
--- exp	2024-10-20 16:07:08.000809049 +0000
+++ out	2024-10-20 16:07:08.002809052 +0000
@@ -1,2 +1,5 @@
-rm: skipping 'a/b', since it's on a different device
-rm: and --preserve-root=all is in effect
+error: unexpected value 'all' for '--preserve-root' found; no more were expected
+
+Usage: rm [OPTION]... FILE...
+
+For more information, try '--help'.
FAIL tests/rm/one-file-system.sh (exit status: 1)