On Mon, 2006-12-18 at 17:21 -0800, Andrew Morton wrote:
> On Mon, 18 Dec 2006 16:57:30 -0800 (PST)
> Linus Torvalds <[email protected]> wrote:
>
> > What happens if you only ifdef out that single thing?
> >
> > The actual page-cleaning functions make sure to only clear the TAG_DIRTY
> > bit _after_ the page has been marked for writeback. Is there some ordering
> > constraint there, perhaps?
> >
> > I'm really reaching here. I'm trying to see the pattern, and I'm not
> > seeing it. I'm asking you to test things just to get more of a feel for
> > what triggers the failure, than because I actually have any kind of idea
> > of what the heck is going on.
> >
> > Andrew, Nick, Hugh - any ideas?
>
> If all of test_clear_page_dirty() has been commented out then the page will
> never become clean hence will never fall out of pagecache, so unless Andrei
> is doing a reboot before checking for corruption, perhaps the underlying
> data on-disk is incorrect, but we can't see it.
if I do a sync and echo 1 > /proc/sys/vm/drop_caches does the reboot is
still necesary ?
>
> Andrei, how _are_ you running this test? What's the exact sequence of steps?
>
> In particular, are you doing anything which would cause the corrupted file
> to be evicted from memory, thus forcing a read from disk? Such as
> unmounting and then remounting the filesystem?
I boot linux, I start rtorrent and start the download, while it's
downloading I start evolution and i check my mail(my mbox is very large,
several hundered megabytes), I close evolution(I use evolution just to
have another application witch uses the filesystem and the memory), I
start evolution again. I start firefox. The download is complete.
Rtorrent says if the hash is good or not. I do a "unrar t qwe.rar" to
test that all 84 downloaded rar files are ok and see the result.
>
> The point of my question is to check that the data is really incorrect
> on-disk, or whether it is incorrect in pagecache.
>
> Also, it'd be useful if you could determine whether the bug appears with
> the ext2 filesystem: do s/ext3/ext2/ in /etc/fstab, or boot with
> rootfstype=ext2 if it's the root filesystem.
I will test.
>
> Thanks.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
