From 4e09396f8aa8f2863b2effd69d1e158fe6d1137e Mon Sep 17 00:00:00 2001
From: Jack Morrison <32687739+jack-morrison@users.noreply.github.com>
Date: Fri, 1 Dec 2023 14:35:54 -0800
Subject: [PATCH] Libfabric: Introduce OPX provider conflict for v1.20.0
 (#41343)

* Libfabric: Introduce OPX provider conflict for v1.20.0
* Add message to libfabric 1.20.0 opx provider conflict
---
 var/spack/repos/builtin/packages/libfabric/package.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/var/spack/repos/builtin/packages/libfabric/package.py b/var/spack/repos/builtin/packages/libfabric/package.py
index 621e2b31f7..bd0f09baeb 100644
--- a/var/spack/repos/builtin/packages/libfabric/package.py
+++ b/var/spack/repos/builtin/packages/libfabric/package.py
@@ -125,6 +125,12 @@ class Libfabric(AutotoolsPackage):
 
     conflicts("@1.9.0", when="platform=darwin", msg="This distribution is missing critical files")
     conflicts("fabrics=opx", when="@:1.14.99")
+    conflicts(
+        "fabrics=opx",
+        when="@1.20.0",
+        msg="Libfabric 1.20.0 uses values in memory that are not correctly "
+        "set by OPX, resulting in undefined behavior.",
+    )
 
     flag_handler = build_system_flags