On Sun, 2006-12-24 at 11:35 -0800, Linus Torvalds wrote:
>
> On Sun, 24 Dec 2006, Gordon Farquharson wrote:
> >
> > The apt cache files (/var/cache/apt/*.bin) still get corrupted with
> > this patch and 2.6.19.
>
> Yeah, if my guess about do_no_page() is right, _none_ of the previous
> patches should have ANY effect what-so-ever. In fact, I'd say that even
> the "ext3 works in writeback mode" thing that Andrei reports is probably a
> total fluke brought on by timing changes rather than anything else.
>
> So please try the latest patch instead (on top of anything that shows
> corruption reliably - the patch should be _totally_ independent of all the
> other issues, and I think it will apply cleanly on top of 2.6.18.3 and
> 2.6.19 too, so anything that shows corruption is a fine target - but try
> to choose something that has been the "best" at corrupting things for you,
> to make the testing as good as possible).
>
> Patch included here again (although I think you were cc'd on my previous
> email too, so you should already have it, and our emails just crossed)
>
> And if this doesn't fix it, I don't know what will..
With latest git and patches:
http://lkml.org/lkml/diff/2006/12/24/56/1
http://lkml.org/lkml/diff/2006/12/24/61/1
Hash check on download completion found bad chunks, consider using
"safe_sync".
>
> Linus
>
> ---
> diff --git a/mm/memory.c b/mm/memory.c
> index 563792f..cf429c4 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -2247,21 +2249,23 @@ retry:
> if (pte_none(*page_table)) {
> flush_icache_page(vma, new_page);
> entry = mk_pte(new_page, vma->vm_page_prot);
> - if (write_access)
> - entry = maybe_mkwrite(pte_mkdirty(entry), vma);
> - set_pte_at(mm, address, page_table, entry);
> if (anon) {
> inc_mm_counter(mm, anon_rss);
> lru_cache_add_active(new_page);
> page_add_new_anon_rmap(new_page, vma, address);
> + if (write_access)
> + entry = maybe_mkwrite(pte_mkdirty(entry), vma);
> } else {
> inc_mm_counter(mm, file_rss);
> page_add_file_rmap(new_page);
> + entry = pte_wrprotect(entry);
> if (write_access) {
> dirty_page = new_page;
> get_page(dirty_page);
> + entry = maybe_mkwrite(pte_mkdirty(entry), vma);
> }
> }
> + set_pte_at(mm, address, page_table, entry);
> } else {
> /* One of our sibling threads was faster, back out. */
> page_cache_release(new_page);
-
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