From e602497789e6f62a0aa63a491eef5445518ac908 Mon Sep 17 00:00:00 2001
From: Arm Patinyasakdikul <arm.patinyasakdikul@amd.com>
Date: Fri, 16 May 2025 08:17:48 -0500
Subject: [PATCH] Added known issue for 6.4.1 release to CHANGELOG.md. (#1697)

---
 CHANGELOG.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0bd43e3cf4..2e159f7925 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -40,6 +40,11 @@ Full documentation for RCCL is available at [https://rccl.readthedocs.io](https:
 * Fixed the accuracy issue for MSCCLPP `allreduce7` kernel in graph mode.
 * Fixed IntraNet performance.
 
+### Known issues
+
+* When splitting a communicator using `ncclCommSplit` in some GPU configurations, MSCCL initialization can cause a segmentation fault.
+  The recommended workaround is to disable MSCCL with `export RCCL_MSCCL_ENABLE=0`.
+
 ## RCCL 2.22.3 for ROCm 6.4.0
 
 ### Added