Re: Memory leak in 2.4.27 kernel, using mmap raw packet sockets

[David S. Miller]

On Tue, 30 Nov 2004 05:16:56 +0100
Andrea Arcangeli <andrea@xxxxxxx> wrote:

> On Mon, Nov 29, 2004 at 08:03:31PM -0800, David S. Miller wrote:
> > 
> > These changes have made 2.4.29-BK stop booting on sparc64.
> > I'll get more information to find out exactly why.
> 
> hmm strange, I would suggest to put a dump_stack here to see where it
> triggers:
> 
>                                if (!pages[i] || PageReserved(pages[i])) {
>                                        if (pages[i] != ZERO_PAGE(start)) {
> +					       dump_stack()
>                                                savevma = vma;
>                                                goto bad_page;   
>                                        }
> 
>                                } else
> 
> The only thing I see that's probably missing for sparc is a
> flush_dcache_page page_cache_get, but that wouldn't prevent booting,
> it'd only corrupt userland as worse (and it was missing from the
> previous code too ;).

It's happening very early on, when we boot the second processor,
which means that something wrt. forking the first kernel thread
is perhaps being messed up.

I can't see how get_user_pages() could be involved there, so like I
said I'll try to get some more info.
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