//src/test/shell/bazel:bazel_cc_code_coverage_test is failing in Bazel postsubmit #16229
Description
Build: https://buildkite.com/bazel/bazel-bazel/builds/20593#018316e3-41c1-4899-b92d-4f2f8dd3f468
Test log: https://storage.googleapis.com/bazel-untrusted-buildkite-artifacts/01831621-521b-4076-8bbf-169cf72b957b/src/test/shell/bazel/bazel_cc_code_coverage_test/test_attempts/attempt_1.log
/var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/ec321eb2cc2d0f8f91b676b6d4c66c29/sandbox/linux-sandbox/6514/execroot/io_bazel/bazel-out/k8-fastbuild/bin/src/test/shell/bazel/bazel_cc_code_coverage_test.runfiles/io_bazel/src/test/shell/bazel/bazel_cc_code_coverage_test: line 277: gcov_location: unbound variable
ls: cannot access '/var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/ec321eb2cc2d0f8f91b676b6d4c66c29/sandbox/linux-sandbox/6514/execroot/io_bazel/_tmp/de074246e1edcaf3b1945672957f04d1/workspace/coverage_dir/*a.gcda.gcov.json.gz': No such file or directory