libbpf: fix BTF dedup to support recursive typedef #6345
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November 13, 2025 03:22
Handle recursive typedefs in BTF deduplication Pahole fails to encode BTF for some Go projects (e.g. Kubernetes and Podman) due to recursive type definitions that create reference loops not representable in C. These recursive typedefs trigger a failure in the BTF deduplication algorithm. This patch extends btf_dedup_ref_type() to properly handle potential recursion for BTF_KIND_TYPEDEF, similar to how recursion is already handled for BTF_KIND_STRUCT. This allows pahole to successfully generate BTF for Go binaries using recursive types without impacting existing C-based workflows. Co-developed-by: Martin Horth <[email protected]> Signed-off-by: Martin Horth <[email protected]> Co-developed-by: Ouail Derghal <[email protected]> Signed-off-by: Ouail Derghal <[email protected]> Co-developed-by: Guilhem Jazeron <[email protected]> Signed-off-by: Guilhem Jazeron <[email protected]> Co-developed-by: Ludovic Paillat <[email protected]> Signed-off-by: Ludovic Paillat <[email protected]> Co-developed-by: Robin Theveniaut <[email protected]> Signed-off-by: Robin Theveniaut <[email protected]> Suggested-by: Tristan d'Audibert <[email protected]> Signed-off-by: Paul Houssel <[email protected]>
Add several ./test_progs tests:
1. btf/dedup:recursive typedef ensures that deduplication no
longer fails on recursive typedefs.
2. btf/dedup:typedef ensures that typedefs are deduplicated correctly
just as they were before this patch.
Signed-off-by: Paul Houssel <[email protected]>
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Upstream branch: 3249e8a |
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Pull request for series with
subject: libbpf: fix BTF dedup to support recursive typedef
version: 3
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1022919