linux-kernel - Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon

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Date:	Thu, 8 Apr 2010 16:16:23 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Borislav Petkov <bp@...en8.de>
cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	sgunderson@...foot.com, hannes@...xchg.org
Subject: Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon_vmas
 of a mergeable VMA

On Thu, 8 Apr 2010, Borislav Petkov wrote:
> 
> And this happens quite often - I changed the WARN_ONCE to WARN and can't
> start kvm, iceowl (mozilla calendar) and the console-kit-daemon craps up
> upon boot too:

Hmm. I tried console-kit-daemon, which I had installed, but didn't get 
anything like that. Probably some setup difference.

I also went through every user of 'vm_area_cachep', and saw nothing 
suspicious at least for the mmu case (I didn't check the nommu.c code). I 
must have missed something.

One thing you could do is to add some more debugging info when that "no 
anon_vma" warning happens. In particular, if you still have the SLUB 
debugging on, you could try to do that

	page = virt_to_head_page(vma);
	object_err(vm_area_cachep, page, (void *)vma, "NULL anon_vma");

and it should give you _which_ routine did the kmem_cache_alloc() for the 
vma that doesn't have an anon_vma.

		Linus
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