Hi. I found out that some of the BTF files provided by BTFHub contain a lot of duplicated types definitions: $ mkdir -p /tmp/foo $ cd /tmp/foo/ $ wget https://github.com/aquasecurity/btfhub/raw/main/ubuntu/20.04/x86_64/5.4.0-88-generic.btf.tar.xz $ tar -xf 5.4.0-88-generic.btf.tar.xz $ bpftool btf dump file 5.4.0-88-generic.btf | grep "STRUCT 'dentry'" [954] STRUCT 'dentry' size=192 vlen=16 [28359] STRUCT 'dentry' size=192 vlen=16 $ bpftool btf dump file 5.4.0-88-generic.btf | grep "STRUCT 'task_struct'" [146] STRUCT 'task_struct' size=9216 vlen=213 [28317] STRUCT 'task_struct' size=9216 vlen=213 $ bpftool btf dump file 5.4.0-88-generic.btf | grep "STRUCT 'file'" [640] STRUCT 'file' size=256 vlen=21 [28416] STRUCT 'file' size=256 vlen=21 I tried to use btf__dedup() but the result is just the same file. Is this expected to have duplicated types in the BTF files? Why aren't those types getting deduplicated by the algorithm? btw, I also noted that the /sys/kernel/btf/vmlinux file contains duplicated types in some kernels, so I don't think it's an issue related to BTFHub. Thanks Mauricio.
