> I did this change once before, while debugging. I had the same issue. This
> BUG_ON was giving me recursive crashes that prevented me knowing WTF was
> going on. I thought I even submitted a patch to remove it. Perhaps I
> forgot to. Nope, I did!
>
>
http://www.ussg.iu.edu/hypermail/linux/kernel/0707.0/1804.html