Ext4 data corruption trouble

I should also take a moment to thank my boss at Oracle for not uttering one word of complaint while I did all this repeated reboot/corrupt/reboot-again stuff, even though it was completely unrelated to the job I was supposed to be doing (except insofar as it is hard to work on anything if your filesystem is mangled!)

I did try to work on it only outside working hours, but it's sometimes hard to concentrate on anything else when your filesystems are at risk, so I fear it did compromise my productivity at other times. So, thank you, Elena. :)