...
int pw_ui_run(int pwtype)
{
    int shutdown_counter = 0;

INFO("nkk71_enc: a\n");
    if(fb_open(0) < 0)
    {
        ERROR("Failed to open framebuffer\n");
        return -1;
    }
INFO("nkk71_enc: b\n");
...
-------------------------------
kmsg log:

[   45.146251] c1    235 trampoline_encmnt: nkk71_enc: hello
[   45.146265] c1    235 trampoline_encmnt: nkk71_enc: argv 1 = decrypt
[   45.146278] c1    235 trampoline_encmnt: nkk71_enc: argument = (null)
[   45.146300] c1    235 trampoline_encmnt: Loading fstab "/mrom.fstab"...
[   45.146534] c1    235 trampoline_encmnt: nkk71_enc: hello2
[   45.146547] c1    235 trampoline_encmnt: Setting encrypted partition data to /dev/block/mmcblk0p47 /dev/block/platform/msm_sdcc.1/by-name/extra ext4
[   45.148176] c1    235 trampoline_encmnt: nkk71_enc: a
[   45.148201] c1    235 mdss_fb_open: fb0 (ref=0)
[   45.148305] c1    235 trampoline_encmnt: Pixel format: 1080x1920 @ 16bpp
[   45.148317] c1    235 trampoline_encmnt: Pixel format: RGB_565
[   45.148785] c1    235 mdss_fb_release_all: remove process trampoline_encm from tracking, pid=235 mfd->ref_cnt=0
[   45.148795] c1    235 mdss_fb_release_all: fb0 release=false (ref=0)
[   45.148888] c1      1 trampoline: Failed to run trampoline_encmnt, exit code 11: (null)
[   45.148900] c1      1 trampoline: /data decryption failed!
[   45.148979] c1      1 trampoline: This is second boot and we couldn't mount /data, reboot!