Bazel 7 "dangling symbolic link" flake #13444
Description
- GCB: https://console.cloud.google.com/cloud-build/builds;region=us-east1/e37e1ada-b4f9-4d8a-9c6d-35737bb96bde;tab=detail?project=cloud-cpp-testing-resources
- Raw: https://storage.googleapis.com/cloud-cpp-community-publiclogs/logs/google-cloud-cpp/main/634e84cdb979dc79c22715b8e56be3e97a929b50/fedora-latest-bazel-coverage/log-e37e1ada-b4f9-4d8a-9c6d-35737bb96bde.txt
ERROR: /h/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_opentelemetry_cpp/sdk/src/common/BUILD:6:11: output 'external/io_opentelemetry_cpp/sdk/src/common/_virtual_includes/random/src/common/random.h' is a dangling symbolic link
ERROR: /h/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_opentelemetry_cpp/sdk/src/trace/BUILD:6:11: output 'external/io_opentelemetry_cpp/sdk/src/trace/_virtual_includes/trace/src/trace/span.h' is a dangling symbolic link
...etc...
ERROR: /h/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_opentelemetry_cpp/api/BUILD:13:11: Symlinking virtual headers for api failed: not all outputs were created or valid
ERROR: /h/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_opentelemetry_cpp/sdk/BUILD:6:11: Symlinking virtual headers for headers failed: not all outputs were created or valid
We only start seeing this flake when we upgrade to Bazel 7, which comes with "Build without bytes" enabled. This other issue seems related: bazelbuild/bazel#19143
In the 4 or 5 times we have seen the flake, the failure has always been with the @io_opentelemetry_cpp repo. I do not know what makes it special. My guess is their use of include_prefix, e.g.: