rock64 - spontaneous reboot

Oct 16 23:05:45 rock64 kernel: [  132.003565] Unable to handle kernel NULL pointer dereference at virtual address 00000018
Oct 16 23:05:45 rock64 kernel: [  132.005047] pgd = ffffffc0f3458000
Oct 16 23:05:48 rock64 kernel: [  132.005624] [00000018] *pgd=0000000000000000, *pud=0000000000000000
Oct 16 23:05:48 rock64 kernel: [  132.006783] Internal error: Oops: 96000005 [#1] SMP
Oct 16 23:05:48 rock64 kernel: [  132.007509] Modules linked in: zram lz4_compress ip_tables x_tables autofs4 dw_hdmi_i2s_audio mali
Oct 16 23:05:48 rock64 kernel: [  132.009053] CPU: 3 PID: 740 Comm: sshd Not tainted 4.4.132-1072-rockchip-ayufan-ga1d27dba5a2e #1
Oct 16 23:05:48 rock64 kernel: [  132.010327] Hardware name: Pine64 Rock64 (DT)
Oct 16 23:05:48 rock64 kernel: [  132.010977] task: ffffffc0e5e30000 task.stack: ffffffc0e5e4c000
Oct 16 23:05:48 rock64 kernel: [  132.011856] PC is at put_page+0x18/0x6c
Oct 16 23:05:48 rock64 kernel: [  132.012439] LR is at skb_release_data+0xc8/0xd4
Oct 16 23:05:48 rock64 kernel: [  132.013110] pc : [<ffffff800819b83c>] lr : [<ffffff80089eba54>] pstate: 20000145
Oct 16 23:05:48 rock64 kernel: [  132.014181] sp : ffffffc0e5e4fbb0
Oct 16 23:05:48 rock64 kernel: [  132.014675] x29: ffffffc0e5e4fbb0 x28: 0000000000000000
Oct 16 23:05:48 rock64 kernel: [  132.015505] x27: ffffffc0f4000950 x26: 00000000000005a8
Oct 16 23:05:48 rock64 kernel: [  132.016334] x25: 0000000000000000 x24: ffffffc0e343fb00
Oct 16 23:05:48 rock64 kernel: [  132.017160] x23: 0000000000000001 x22: ffffffc0f4000880
Oct 16 23:05:48 rock64 kernel: [  132.017988] x21: 0000000000000002 x20: ffffffc0e343fb00
Oct 16 23:05:48 rock64 kernel: [  132.018816] x19: 0000000000000018 x18: 0000007feef33578
Oct 16 23:05:48 rock64 kernel: [  132.019644] x17: 0000007f7bba6a78 x16: ffffff80081e51fc
Oct 16 23:05:48 rock64 kernel: [  132.020472] x15: 00000000000000bb x14: e4b6cd172ef7c16f
Oct 16 23:05:48 rock64 kernel: [  132.021298] x13: 00000000ffffffff x12: 0000000000000048
Oct 16 23:05:48 rock64 kernel: [  132.022125] x11: ffffff8009301600 x10: dead000000000200
Oct 16 23:05:48 rock64 kernel: [  132.022953] x9 : dead000000000100 x8 : 0000000000000048
Oct 16 23:05:48 rock64 kernel: [  132.023780] x7 : ffffff8009301600 x6 : ffffffbdc3d02820
Oct 16 23:05:48 rock64 kernel: [  132.024606] x5 : 00000000000000d8 x4 : 00000000ffffffff
Oct 16 23:05:48 rock64 kernel: [  132.025434] x3 : ffffff80093016d8 x2 : 00000040f5df8000
Oct 16 23:05:48 rock64 kernel: [  132.026261] x1 : 0000000000000003 x0 : ffffff80089eba54