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"