I tried to take the log from alexelec and it looks like what you said. It doesn't fit, does it?
From a completely different operating system, I won't really get information about the status of the driver I modified, so it's unfortunately useless for me. However, I/O errors related to the SD card are also present here, only in a smaller volume.
It would be worth running this in overwrite mode, before you write an image to the SD card again.