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-rw-r--r--libraries/base/tests/IO/all.T3
1 files changed, 2 insertions, 1 deletions
diff --git a/libraries/base/tests/IO/all.T b/libraries/base/tests/IO/all.T
index 1912be7c94..2eb37e02fa 100644
--- a/libraries/base/tests/IO/all.T
+++ b/libraries/base/tests/IO/all.T
@@ -84,7 +84,8 @@ test('hGetBuf001',
expect_fail_if_windows],
compile_and_run, ['-package unix'])
-test('hDuplicateTo001', [], compile_and_run, [''])
+# As discussed in #16819, this test is racy in a threaded environment.
+test('hDuplicateTo001', [omit_ways(concurrent_ways)], compile_and_run, [''])
test('countReaders001', [], compile_and_run, [''])