Here are output bootlog crash on latest snapshot. Revert back to 18.06 work normally.
[ 20.508863] mount_root: rootdisk overlay filesystem has not been formatted ye t
[ 20.709750] urandom_read: 1 callbacks suppressed
[ 20.709760] random: mkfs.f2fs: uninitialized urandom read (16 bytes read)
[ 20.721554] print_req_error: I/O error, dev loop0, sector 0
[ 20.727252] print_req_error: I/O error, dev loop0, sector 8388600
[ 20.733443] print_req_error: I/O error, dev loop0, sector 16777200
[ 20.739648] print_req_error: I/O error, dev loop0, sector 25165800
[ 21.216083] random: crng init done
[ 44.249000] F2FS-fs (loop0): Wrong segment_count / block_count (7404 > 0)
[ 44.255862] F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
[ 44.263472] F2FS-fs (loop0): Wrong segment_count / block_count (7404 > 0)
[ 44.270347] F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock
[ 44.277840] F2FS-fs (loop0): Wrong segment_count / block_count (7404 > 0)
[ 44.284693] F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
[ 44.292045] F2FS-fs (loop0): Wrong segment_count / block_count (7404 > 0)
[ 44.298863] F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock
[ 44.319322] mount_root: failed to mount -t f2fs /dev/loop0 /tmp/overlay: Invalid argument
[ 44.328026] mount_root: overlay filesystem has not been fully initialized yet
[ 44.336469] mount_root: switching to f2fs overlay
[ 44.341501] mount_root: switching to f2fs failed - fallback to ramoverlay
- config restore -
[ 44.563477] urandom-seed: Seeding with /etc/urandom.seed
[ 44.661331] eth0: Link down
[ 44.675213] procd: - early -
[ 44.678263] procd: - watchdog -
[ 45.303263] procd: - watchdog -
[ 45.306917] procd: - ubus -
[ 45.362682] procd: - init -
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OpenWrt SNAPSHOT, r8684-f6e9f23