From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Mon, 19 Mar 2007 20:18:14 -0700 (PDT)

quoted

quoted

Please don't subject us to another couple months of hair-pulling only
to have Linus yank the thing out again, there are certainly more
useful things to spend time on :-)

Good call. Dwarf2 unwinding simply isn't worth doing. But I won't yank it 
out, I simply won't merge it. It was more than just totally buggy code, it 
was an inability of the people to understand that even bugfree code 
isn't enough - you have to be able to also handle buggy data.

Thank you.