diff --git a/sys-libs/glibc/glibc-2.39-r9.ebuild b/sys-libs/glibc/glibc-2.39-r9.ebuild
index de63f7d4c8f89..f13a557d9c052 100644
--- a/sys-libs/glibc/glibc-2.39-r9.ebuild
+++ b/sys-libs/glibc/glibc-2.39-r9.ebuild
@@ -181,6 +181,9 @@ XFAIL_TEST_LIST=(
 
 	# Fails regularly, unreliable
 	tst-valgrind-smoke
+
+	# https://sourceware.org/bugzilla/show_bug.cgi?id=31877 (bug #927973)
+	tst-shstk-legacy-1g
 )
 
 XFAIL_NSPAWN_TEST_LIST=(
diff --git a/sys-libs/glibc/glibc-9999.ebuild b/sys-libs/glibc/glibc-9999.ebuild
index c7e9b1d0e94a4..9c4e809026bb0 100644
--- a/sys-libs/glibc/glibc-9999.ebuild
+++ b/sys-libs/glibc/glibc-9999.ebuild
@@ -181,6 +181,9 @@ XFAIL_TEST_LIST=(
 
 	# Fails regularly, unreliable
 	tst-valgrind-smoke
+
+	# https://sourceware.org/bugzilla/show_bug.cgi?id=31877 (bug #927973)
+	tst-shstk-legacy-1g
 )
 
 XFAIL_NSPAWN_TEST_LIST=(