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a=QEXdDO2ut3YA:10 a=bA3UWDv6hWIuX7UZL3qL:22 cc=ntf awl=host:12110 On 09/01/2026 10:33, bot+bpf-ci@kernel.org wrote: >> diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c >> index 84a4b0abc8be..8ef0354e66cc 100644 >> --- a/tools/lib/bpf/btf.c >> +++ b/tools/lib/bpf/btf.c > > [ ... ] > >> @@ -4688,7 +4686,24 @@ static int btf_dedup_is_equiv(struct btf_dedup *d, __u32 cand_id, >> return fwd_kind == real_kind; >> } >> >> - if (cand_kind != canon_kind) >> + /* >> + * Types are considered equivalent if modifiers (const, volatile, >> + * restrict) are present for one but not the other. >> + */ >> + if (cand_kind != canon_kind) { >> + __u32 next_cand_id = cand_id; >> + __u32 next_canon_id = canon_id; >> + >> + if (btf_is_mod(cand_type) && !btf_is_type_tag(cand_type)) >> + next_cand_id = cand_type->type; >> + if (btf_is_mod(canon_type) && !btf_is_type_tag(canon_type)) >> + next_canon_id = canon_type->type; >> + if (cand_id == next_cand_id && canon_id == next_canon_id) >> + return 0; >> + return btf_dedup_is_equiv(d, next_cand_id, next_canon_id); >> + } > > Can this recursive call fail when there are multiple levels of modifiers? > > Consider comparing "volatile const int" (cand_id=20) against "int" (canon_id=5): > > 1. The first call adds hypot_map[5] = 20 via btf_dedup_hypot_map_add() > earlier in btf_dedup_is_equiv() before the kinds are checked. > > 2. btf_is_mod(VOLATILE) is true, so next_cand_id becomes the underlying > "const int" (ID=15), while next_canon_id stays at 5 since INT is not > a modifier. > > 3. The recursive call btf_dedup_is_equiv(d, 15, 5) is made. > > 4. In the recursive call, hypot_map[5] is already set to 20 (from step 1). > Since 20 != 15, the code falls through to btf_dedup_identical_types(). > > 5. btf_dedup_identical_types(d, 20, 15) compares VOLATILE vs CONST kinds, > which differ, so it returns false. > > 6. The function returns 0, incorrectly reporting the types as not equivalent. > > This appears to break the intended behavior for types with nested modifiers > like "volatile const X" vs "X", even though single modifiers like > "volatile X" vs "X" would work correctly (because next_cand_id and > next_canon_id would both resolve to the same underlying type). > > The above is all true, but I _think_ it neglects an aspect of deduplication; that it is symmetric; i.e. in one case a type id is canonical, and in another it is a candidate. So for the above case, consider what happens when cand_id=5 ("int") and canon_id=20 ("volatile const int"): 1. we add hypot_map[20] = 5 (i.e hypot_map["volatile const int"] = "int"; 2. btf_is_mod(VOLATILE) is true so we recurse to btf_dedup_is_equiv(d, 5, 15) (where 15 is "const int") 3. hypot_map[15] is not set so we do equivalence checking and recurse to btf_dedup_is_equiv(d, 5, 5) ("int") and return 1. 4. As a result the original hypot_map["volatile const int"] = "int" is verified. So unless I'm missing something we end up deduplicating successfully in this case, but the deduplication is weighted towards making the more complex type canonical. That's what we want I think since these equivalence checks will be just used to validate struct/union equivalence. > --- > AI reviewed your patch. Please fix the bug or email reply why it's not a bug. > See: https://github.com/kernel-patches/vmtest/blob/master/ci/claude/README.md > > CI run summary: https://github.com/kernel-patches/bpf/actions/runs/20848783658