This test, introduced by b042d15d2e39eea528c51a30fe637b9ea84250d3, fails on https://lab.llvm.org/buildbot/#/builders/83/builds/20933/steps/7/logs/stdio but succeeds on other targets, see for instance https://lab.llvm.org/buildbot/#/builders/68/builds/35462/steps/6/logs/stdio This test is not be arch specific, just disabling it on Windows.