Okay I solved it myself.
Once kmod-fs-ntfs exists, ntfs-3g doesn't work. So just remove kmod-fs-ntfs.
log after removing kmod-fs-ntfs
Sat Apr 28 16:01:00 2018 kern.info kernel: [ 417.320100] usb 2-1: new high-speed USB device number 2 using ehci-platform
Sat Apr 28 16:01:00 2018 kern.info kernel: [ 417.471941] usb-storage 2-1:1.0: USB Mass Storage device detected
Sat Apr 28 16:01:00 2018 kern.info kernel: [ 417.478345] scsi host0: usb-storage 2-1:1.0
Sat Apr 28 16:01:01 2018 kern.notice kernel: [ 418.481368] scsi 0:0:0:0: Direct-Access SanDisk Cruzer Fit 1.00 PQ: 0 ANSI: 6
Sat Apr 28 16:01:01 2018 kern.notice kernel: [ 418.490977] sd 0:0:0:0: [sda] 15630336 512-byte logical blocks: (8.00 GB/7.45 GiB)
Sat Apr 28 16:01:01 2018 kern.notice kernel: [ 418.500070] sd 0:0:0:0: [sda] Write Protect is off
Sat Apr 28 16:01:01 2018 kern.debug kernel: [ 418.504907] sd 0:0:0:0: [sda] Mode Sense: 43 00 00 00
Sat Apr 28 16:01:01 2018 kern.notice kernel: [ 418.505953] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
Sat Apr 28 16:01:01 2018 kern.info kernel: [ 418.525340] sda: sda1
Sat Apr 28 16:01:01 2018 kern.notice kernel: [ 418.532252] sd 0:0:0:0: [sda] Attached SCSI removable disk
Sat Apr 28 16:01:02 2018 user.notice Auto-Mount: Block /dev/sda1 added.
Sat Apr 28 16:01:02 2018 user.notice Auto-Mount: UUID=A2F05308F052E1D9
Sat Apr 28 16:01:03 2018 user.notice Auto-Mount: New block.File system:ntfs
Sat Apr 28 16:01:03 2018 daemon.err block: /dev/ubiblock0_0 is already mounted on /rom
Sat Apr 28 16:01:03 2018 daemon.err block: /dev/ubi0_1 is already mounted on /overlay
Sat Apr 28 16:01:04 2018 daemon.notice ntfs-3g[12970]: Version 2016.2.22 external FUSE 29
Sat Apr 28 16:01:04 2018 daemon.notice ntfs-3g[12970]: Mounted /dev/sda1 (Read-Write, label "", NTFS 3.1)
Sat Apr 28 16:01:04 2018 daemon.notice ntfs-3g[12970]: Cmdline options: iocharset=utf8,big_writes,noatime
Sat Apr 28 16:01:04 2018 daemon.notice ntfs-3g[12970]: Mount options: iocharset=utf8,allow_other,nonempty,noatime,fsname=/dev/sda1,blkdev,blksize=4096
Sat Apr 28 16:01:04 2018 daemon.notice ntfs-3g[12970]: Ownership and permissions disabled, configuration type 1