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Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon_vmas of a mergeable VMA

From:  Linus Torvalds <>
To:  Borislav Petkov <>
Subject:  Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon_vmas of a mergeable VMA
Date:  Mon, 12 Apr 2010 15:11:53 -0700 (PDT)
Cc:  Johannes Weiner <>, KOSAKI Motohiro <>, Rik van Riel <>, Andrew Morton <>, Minchan Kim <>, Linux Kernel Mailing List <>, Lee Schermerhorn <>, Nick Piggin <>, Andrea Arcangeli <>, Hugh Dickins <>,
Archive-link:  Article, Thread

On Mon, 12 Apr 2010, Borislav Petkov wrote:
> > I have a new theory. And this new theory is completely different from all 
> > the other things we've been looking at.
> Yeah, because all starts with "I have a new theory..." :o)

Hey, all my other theories made sense too.. They just didn't work.

But as Edison said: I didn't fail, I just found three other ways to not 
fix your bug.

> > The patch below is my largely mindless try at fixing this. It's untested. 
> > I'm not entirely sure that it actually works. But it makes some amount of 
> > conceptual sense. No?
> Linus, are you trying to give me a heart-attack? This sh*t just survived
> 20(!) hibernation runs without a problem (well, there is this nagging
> /sysfs lockdep warning) but apart from that, it survived! I even did my
> all time best when hitting on it. Normally, it used to crap up on the
> 6th cycle as latest. Now we're rock solid. And yes, there were something
> like ~64Mb in the swap cache.
> Also, I have your verification stuff in addition to the 4 patches you
> sent before. Not a single WARN_ONCE got triggered. So I have a gut
> feeling that it is fixed but you never know with these beasts.

Ok. That does sound very positive. Of course, last time you sounded 
positive, I had an email from you half an hour later that said "oh no, it 
oopsed again". So I'll take it with a bit of salt, but on the whole I'll 
be optimistic about it.


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