I unsafely removed a USB device that was attached to loop0 with losetup and could not delete nor detach loop0 afterwards.
losetup -a shows /dev/loop0: [0005]:145606719 (/dev/sdb1)
When I remount the device to /dev/sdb1, umount it and try losetup -d /dev/loop0, I will still get the same error loop: can't delete device /dev/loop0: Device or resource busy. Is there a way to get rid of the loop device?