The names of called functions are not resolved if `aa` is not invoked prior to invoking `pdg`

[jxuanli]

For example:

[0xffffffff816ff3e0]> s sym.free_msg
[0xffffffff816ff4a0]> af
[0xffffffff816ff4a0]> pdg

void sym.free_msg(int64_t param_1)

{
    int64_t *piVar1;
    int64_t *piVar2;
    uchar *puVar3;
    ulong uStack_18;

    uStack_18 = 0xffffffff816ff4ae;
    func_0xffffffff8171df00();
    piVar2 = *(param_1 + 0x20);
    *(&stack0xfffffffffffffff0 + -8) = 0xffffffff816ff4ba;
    func_0xffffffff814f27e0(param_1);
    puVar3 = &stack0xfffffffffffffff0;
    if (piVar2 != NULL) {
        do {
            piVar1 = *piVar2;
            *(puVar3 + -8) = 0xffffffff816ff4ca;
            func_0xffffffff821f4c18();
            *(puVar3 + -8) = 0xffffffff816ff4d2;
            func_0xffffffff814f27e0(piVar2);
            puVar3 = puVar3;
            piVar2 = piVar1;
        } while (piVar1 != NULL);
    }
    return;
}

whereas

[0xffffffff816ff4a0]> pdd
/* r2dec pseudo code output (r2 5.9.8) */
/* vmlinux @ 0xffffffff816ff4a0 */
#include <stdint.h>

void free_msg (int64_t arg1) {
    rdi = arg1;
    security_msg_msg_free (rbx);
    rbx = *((rbp + 0x20));
    rdi = rbp;
    kfree ();
    if (rbx == 0) {
        goto label_0;
    }
    do {
        rbx = *(rbx);
        SCT_cond_resched ();
        rdi = rbp;
        kfree ();
    } while (rbx != 0);
label_0:
    return pi_x86_return_thunk ();
}

The target is a vmlinux.