gwern comments on Harry Potter and the Methods of Rationality discussion thread, part 3 - Less Wrong
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These chapters (43-46) seem to have several pieces of evidence for the "Harrymort" theory. Quirrell's reaction suggests that he recognizes the particular ideas that Harry had, which in turn suggests they're where he hid his horcruxes. That those locations also seemed obvious to Harry could be simply because they are obvious, and Voldemort used them for that same reason, but it could also indicate Harry somehow "remembering" them. That Voldemort might not have actually attempted to kill Harry after having killed Lily also suggests something may have been up there, though Voldemort may have been simply lying. And we also now have a bit of evidence that Harry's "dark side" may actually be real.
Canonically, IIRC, obliviation can be broken by sufficient torture.
Canonically? Where?
The only thing resembling actual "unobliviating" that I can think of is Lockheart apparently slowly slightly recovering from his memory charm blowing up in his face via the broken wand. And that was after several years of ongoing treatment at St. Mungo's.
Bertha Jorkins. After she found out that the Crouch family was keeping Barty Crouch Jr. imprisoned in their house, Crouch Sr. put a Memory Charm on her strong enough to cause her permanent brain damage and forgetfulness. But Voldemort was able to break through it with torture.
Yeah, as I replied to Eliezer, I had no memory of that, appropriately enough. :P
Goblet of Fire, Bertha. We could possibly assume that her Obliviation was intended to be of the undoable sort to begin with, like what canon!Hermione did to her parents (so Bertha could still work on her job while she was at work, or regain the memories after the Tournament).
Huh. I had no memory of that (appropriately enough. :P) *goes to look that up* Huh.
Although according to this, she did suffer permanent brain damage from the memory charm itself, so not exactly what I'd call reversible, but yeah, point to gwern and you.