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selftests/bpf: Log arg_track_join for stack arg slots in liveness analysis

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Commit 2af4e79277 ("bpf: Extend liveness analysis to track stack argument slots")
added stack arg supports. For selftest
  verifier_stack_arg/stack_arg: pruning with different stack arg types
the following are two arg JOIN messages:
  arg JOIN insn 9 -> 10 r1: fp0-8 + _ => fp0-8|fp0+0
  arg JOIN insn 9 -> 10 r11: fp0-8 + _ => fp0-8|fp0+0

Here the "r11:" label for stack arg slot 0 is misleading since r11
is a special register (BPF_REG_PARAMS). The next patch corrects
this to "sa0:", properly representing the 'stack arg slot 0'.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20260515225051.822739-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yonghong Song
2026-05-15 15:50:51 -07:00
committed by Alexei Starovoitov
parent ef1b54e0db
commit 0e2647792f
1 changed files with 3 additions and 1 deletions
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4
tools/testing/selftests/bpf/progs/verifier_stack_arg.c
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@@ -114,8 +114,10 @@ __naked void stack_arg_gap_at_minus8(void)
SEC("tc")
__description("stack_arg: pruning with different stack arg types")
__failure
__failure __log_level(2)
__flag(BPF_F_TEST_STATE_FREQ)
__msg("arg JOIN insn 9 -> 10 r1: fp0-8 + _ => fp0-8|fp0+0")
__msg("arg JOIN insn 9 -> 10 r11: fp0-8 + _ => fp0-8|fp0+0")
__msg("R{{[0-9]}} invalid mem access 'scalar'")
__naked void stack_arg_pruning_type_mismatch(void)
{