[PATCH bpf-next] selftests/bpf: workaround stdout issue in VM launched by vmtest.sh

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This apply a workaround to fix stdout issue in `./vmtest.sh` invocations,
but doesn't work on `./vmtest.sh -s`

Signed-off-by: Yucong Sun <fallentree@xxxxxx>
---
 tools/testing/selftests/bpf/vmtest.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/bpf/vmtest.sh b/tools/testing/selftests/bpf/vmtest.sh
index e0bb04a97e10..a9f943a84ed5 100755
--- a/tools/testing/selftests/bpf/vmtest.sh
+++ b/tools/testing/selftests/bpf/vmtest.sh
@@ -184,6 +184,10 @@ EOF
 	fi
 
 	sudo bash -c "echo '#!/bin/bash' > ${init_script}"
+	sudo bash -c "cat >>${init_script}" <<EOF
+# Force rebinding stdout/stderr to /dev/ttyS0, to workaround a mysterious issue
+exec 1>/dev/ttyS0 2>/dev/ttyS0
+EOF
 
 	if [[ "${command}" != "" ]]; then
 		sudo bash -c "cat >>${init_script}" <<EOF
-- 
2.30.2





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