From b7cff307003b8da9fc10e6c150e55a23900f3dfa Mon Sep 17 00:00:00 2001
From: Nick Begg <nick@stunttruck.net>
Date: Tue, 21 Apr 2026 18:50:47 +0200
Subject: [PATCH 1/2] gh-148841: Fix test_posix on FreeBSD 15 with zfs filesys

Handle EOPNOTSUPP as well as EINVAL in this case.
---
 Lib/test/test_os/test_posix.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Lib/test/test_os/test_posix.py b/Lib/test/test_os/test_posix.py
index 0e8495a4eff2ed..d2c8c3881423c8 100644
--- a/Lib/test/test_os/test_posix.py
+++ b/Lib/test/test_os/test_posix.py
@@ -415,7 +415,8 @@ def test_posix_fallocate(self):
             if inst.errno == errno.EINVAL and sys.platform.startswith(
                 ('sunos', 'freebsd', 'openbsd', 'gnukfreebsd')):
                 raise unittest.SkipTest("test may fail on ZFS filesystems")
-            elif inst.errno == errno.EOPNOTSUPP and sys.platform.startswith("netbsd"):
+            elif inst.errno == errno.EOPNOTSUPP and sys.platform.startswith(
+                    ("netbsd", "freebsd")):
                 raise unittest.SkipTest("test may fail on FFS filesystems")
             else:
                 raise

From 79f0f1ed0abccca86d5d896be32b337e4f019695 Mon Sep 17 00:00:00 2001
From: Nick Begg <nick@stunttruck.net>
Date: Fri, 24 Apr 2026 02:12:50 +0200
Subject: [PATCH 2/2] add blurb

---
 .../next/Tests/2026-04-24-02-12-30.gh-issue-148841.34XIIP.rst   | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Tests/2026-04-24-02-12-30.gh-issue-148841.34XIIP.rst

diff --git a/Misc/NEWS.d/next/Tests/2026-04-24-02-12-30.gh-issue-148841.34XIIP.rst b/Misc/NEWS.d/next/Tests/2026-04-24-02-12-30.gh-issue-148841.34XIIP.rst
new file mode 100644
index 00000000000000..fe0b6fc1d6d5ff
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2026-04-24-02-12-30.gh-issue-148841.34XIIP.rst
@@ -0,0 +1,2 @@
+When calling fallocate() on a zfs filesystem, FreeBSD 15 returns EOPNOTSUPP,
+as NetBSD does. This is causing test_os to fail - Handle this case as well.