Re: [PATCH v2 1/2] tools/bpf/bpftool: Reset vmlinux BTF after map commands

[bot+bpf-ci]

> get_map_kv_btf() caches the vmlinux BTF object when a map uses
> btf_vmlinux_value_type_id. map dump released that object when the
> command completed, but left the global pointer stale.
>
> The same cached object can also be returned to print_key_value(), which
> freed it directly. That leaves btf_vmlinux dangling before the command
> cleanup path runs.
>
> Use free_map_kv_btf() for per-entry cleanup, and reset the cached
> btf_vmlinux pointer when the map command releases the object. This keeps
> batch mode from reusing a freed BTF object.
>
> Signed-off-by: Yichong Chen <chenyichong@xxxxxxxxxxxxx>

This looks like a bug fix for the cached vmlinux BTF handling that was
introduced when map dumping started caching btf_vmlinux via
get_map_kv_btf()/free_map_kv_btf().  Should this carry a Fixes: tag?

  Fixes: 935d8fbd135d ("bpftool: Support dumping a map with btf_vmlinux_value_type_id")


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