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9a17db586d
When running `bpftool` on a kernel module installed in `/lib/modules...`, this error is encountered if the user does not specify `--base-btf` to point to a valid base BTF (e.g. usually in `/sys/kernel/btf/vmlinux`). However, looking at the debug output to determine the cause of the error simply says `Invalid BTF string section`, which does not point to the actual source of the error. This just improves that debug message to tell users what happened. Signed-off-by: Ben Olson <matthew.olson@intel.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/Z0YqzQ5lNz7obQG7@bolson-desk Signed-off-by: Alexei Starovoitov <ast@kernel.org>