On Mon, Dec 24, 2007 at 03:13:56PM +0800, Fengguang Wu wrote:
> On Mon, Dec 24, 2007 at 10:25:53AM +0800, Fengguang Wu wrote:
> > On Sun, Dec 23, 2007 at 10:35:45AM -0800, [EMAIL PROTECTED] wrote:
> > > http://bugzilla.kernel.org/show_bug.cgi?id=9291
> >
> > Hmm, I just tried JFS on LVM - still OK.
> > It seems not related to LVM.
>
> I can now reproduce the bug on JFS with the following command:
>
> debootstrap --arch i386 etch /mnt/jfs http://debian.ustc.edu.cn/debian
>
> It's a rather compound procedure, but I just cannot trigger the bug through
> simple operations like cp/concatenate/truncate ...
>
> The symptoms:
>
> - one pdflush stuck in D state:
>
> USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
> root 321 0.0 0.0 0 0 ? D 13:45 0:01 [pdflush]
> root 15397 0.0 0.0 0 0 ? S 14:21 0:00 [pdflush]
It was confirmed that the source of this bug lies in metapage_writepage():
if (!mp || !test_bit(META_dirty, &mp->flag))
continue;
That logic skips the following line:
set_page_writeback(page);
which should be called to clear the PAGECACHE_TAG_DIRTY tag.
The META_dirty bit could be cleared in several places, e.g.
__invalidate_metapages().
Any ideas about a solution?
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