Shutdown hangs on a Pi with USB storage attached

Tested with a USB→SATA adapter with an Intel 313 SSD attached, on a Pi3 with RO5.27 (27-01-19 build) and Firmware dated 14-01-19

Edit: The issue may be in FAT32FS (tested with 1.53)

Repro 1:

1. Boot from SD
2. Insert a USB drive with the Pi SD image written to it
3. Open the USB drive via its Filer – which will open the FAT partition as it can’t see the FileCore partition
4. Attempt to shutdown

Repro 2:

1. Boot from USB
2. Insert an SD with the Pi image written to it
3. Open the SD via its Filer – which will open the FAT partition as it can’t see the FileCore partition
4. Shutdown

CTRL-SHIFT-F12 works, but selecting Shutdown from the Pi icon hangs the machine.

Perhaps RO has shutdown its filesystem handling and can no longer see the partition with the ROM image in order to be able to restart?
In which case a shutdown with reboot would require a reset of the Pi hardware. I think Chris Hall had done some work with driving the appropriate GPIO pin(s) high/low.

Perhaps RO has shutdown its filesystem handling and can no longer see the partition with the ROM image in order to be able to restart?

I run all my Pi systems with the SDFS filesystem killed off (rmkill SDFSfiler) at boot time and none of them hang at shutdown or reboot. They all have the active filesystem on USB (SCSI drive 4).

I did at one time have an issue with Aemulor causing a hang at shutdown time, but that was resolved some time ago, perhaps when I upgraded from 5.23 to 5.24.

I’ve now had a chance to do some more detailed testing and have corrected my initial post. It appears all shutdown’s cause it to hang but its needs to have seen a FAT partition first, so the issue may be in FAT32FS – not RISCOS.

Added some Repro’s to the OP, if other folk would like to see if it is reproducable.