STACK_INVALID 405 kernel/bpf/verifier.c [STACK_INVALID] = '?', STACK_INVALID 506 kernel/bpf/verifier.c if (state->stack[i].slot_type[j] != STACK_INVALID) STACK_INVALID 6822 kernel/bpf/verifier.c st->stack[i].slot_type[j] = STACK_INVALID; STACK_INVALID 7030 kernel/bpf/verifier.c if (old->stack[spi].slot_type[i % BPF_REG_SIZE] == STACK_INVALID)