Kernel Panic on Rock64 linux

[rmbusy]

I saw a kernel panic w/ xenial-minimal-rock64-0.4.17-85-arm64.img after I unplugged a USB 3.0 hard disk (nothing was mounted on it).  Seems like the OS thought it was still connected.

[ 7800.498794] INFO: task parted:5470 blocked for more than 120 seconds.
[ 7800.499779]       Not tainted 4.4.70-rockchip-ayufan-85 #1
[ 7800.500569] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 7800.502124] Kernel panic - not syncing: hung_task: blocked tasks
[ 7800.502998] CPU: 3 PID: 29 Comm: khungtaskd Not tainted 4.4.70-rockchip-ayufan-85 #1
[ 7800.504105] Hardware name: PINE64 ROCK64 (DT)

Playing with jessie-minimal-rock64-0.5.7-101-arm64.img now, and don't see the same issue.  It does take several seconds for it to decide the USB device is no longer available when I unplugged the cable.  Nothing was active when the cable was unplugged, it just spewed the following to the console :
[  873.393783] usb usb5-port1: Cannot enable. Maybe the USB cable is bad?
[  873.394805] xhci-hcd xhci-hcd.8.auto: Cannot set link state.
[  873.395754] usb usb5-port1: cannot disable (err = -32)
[  875.910788] usb usb5-port1: Cannot enable. Maybe the USB cable is bad?
[  875.911801] xhci-hcd xhci-hcd.8.auto: Cannot set link state.
[  875.912735] usb usb5-port1: cannot disable (err = -32)
[  878.426774] usb usb5-port1: Cannot enable. Maybe the USB cable is bad?
[  878.427787] xhci-hcd xhci-hcd.8.auto: Cannot set link state.
[  878.428729] usb usb5-port1: cannot disable (err = -32)
[  880.943791] usb usb5-port1: Cannot enable. Maybe the USB cable is bad?
[  880.944809] xhci-hcd xhci-hcd.8.auto: Cannot set link state.
[  880.945741] usb usb5-port1: cannot disable (err = -32)
[  880.946543] xhci-hcd xhci-hcd.8.auto: Cannot set link state.
[  880.947492] usb usb5-port1: cannot disable (err = -32)
[  880.948328] scsi host0: uas_post_reset: alloc streams error -19 after reset
[  880.952607] sd 0:0:0:0: [sda] Synchronizing SCSI cache

Edit: Looks like the latest jessie minimal also panics after disconnecting USB 3.0 device. Filed a issue on github, with ayufan (not sure if it was the right project page though).