Hi ,
take the following steps:
$mount -t ceph monip:6789:/ /mnt/ceph
$dd if=/dev/zero of=/mnt/ceph/2G bs=1M count=2048 conv=fsync
----------------
copy_test:
#!/bin/bash
cp /mnt/ceph/2G /mnt/$1/
------------------
$copy_test 01 &
$copy_test 02 &
$copy_test 03 &
$copy_test 04 &
$copy_test 05 &
$copy_test 06 &
$copy_test 07 &
$copy_test 08 &
$copy_test 09 &
Jeff
On Tue, 2011-10-25 at 00:09 +0800, Sage Weil wrote:
> Thanks, Jeff!
>
> Was there a workload that reliably triggered this case?
>
> sage
>
>
> On Mon, 24 Oct 2011, Jeff Wu wrote:
>
> > Hi ,
> >
> > start_read() do twice "kfree(pages)",
> >
> > ................
> > out_pages:
> > ceph_release_page_vector(pages, nr_pages);
> > kfree(pages);
> >
> >
> > ceph_release_page_vector had kfree pages, continue to do kfree(pages),
> > sometimes ,async read ,printk "BUG kmalloc-16: Object already
> > free" ,then OOPS.
> >
> > Jeff Wu
> >
> > ----------------------------------------------------------------------
> > void ceph_release_page_vector(struct page **pages, int num_pages)
> > {
> > int i;
> >
> > for (i = 0; i < num_pages; i++)
> > __free_pages(pages[i], 0);
> > kfree(pages);
> > }
> >
> >
> > $ git diff
> > diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
> > index 5ffee90..4144caf 100644
> > --- a/fs/ceph/addr.c
> > +++ b/fs/ceph/addr.c
> > @@ -345,7 +345,6 @@ static int start_read(struct inode *inode, struct
> > list_head *page_list, int max)
> >
> > out_pages:
> > ceph_release_page_vector(pages, nr_pages);
> > - kfree(pages);
> > out:
> > ceph_osdc_put_request(req);
> > return ret;
> >
> >
> > On Thu, 2011-09-29 at 03:16 +0800, Sage Weil wrote:
> > > On Wed, 28 Sep 2011, Sage Weil wrote:
> > > > I'll send this upstream with the other patches so it'll hopefully make
> > > > 3.1...
> > >
> > > Er, not really.. this'll go upstream during the next merge window, along
> > > with the readahead code. :)
> > >
> > > sage
> > >
> > >
> > > >
> > > > Thanks!
> > > > sage
> > > >
> > > >
> > > > On Wed, 28 Sep 2011, David Flynn wrote:
> > > >
> > > > > The finish_read callback introduced in 63c90314546c1cec1f220f6ab24ea
> > > > > fails to release the page list allocated in start_read.
> > > > > ---
> > > > > fs/ceph/addr.c | 1 +
> > > > > 1 files changed, 1 insertions(+), 0 deletions(-)
> > > > >
> > > > > diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
> > > > > index e06a322..4144caf 100644
> > > > > --- a/fs/ceph/addr.c
> > > > > +++ b/fs/ceph/addr.c
> > > > > @@ -261,6 +261,7 @@ static void finish_read(struct ceph_osd_request
> > > > > *req, struct ceph_msg *msg)
> > > > > unlock_page(page);
> > > > > page_cache_release(page);
> > > > > }
> > > > > + kfree(req->r_pages);
> > > > > }
> > > > >
> > > > > /*
> > > > > --
> > > > > 1.7.4.1
> > > > > --
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