Hi Satoru,
On Wed, Jun 25, 2014 at 04:25:01PM +0900, Satoru Takeuchi wrote:
> Hi Liu,
>
> (2014/06/24 16:39), Liu Bo wrote:
> > The reproducer is
> >
> > $ mkfs.btrfs D1 D2 D3 -mraid5
> > $ mkfs.ext4 D2 && mkfs.ext4 D3
> > $ mount D1 /btrfs -odegraded
>
> Tested-by: Satoru Takeuchi<takeuchi_satoru@xxxxxxxxxxxxxx>
>
> Here is the result of the last mount.
>
> ===
> ...
> mount: wrong fs type, bad option, bad superblock on /dev/vdb1,
> missing codepage or helper program, or other error
>
> In some cases useful info is found in syslog - try
> dmesg | tail or so.
> ===
>
> It "correctly" failed :-)
Thanks for testing it :)
thanks,
-liubo
>
> Thanks,
> Satoru
>
> >
> > -------------------
> >
> > [ 87.672992] ------------[ cut here ]------------
> > [ 87.673845] kernel BUG at fs/btrfs/raid56.c:1828!
> > ...
> > [ 87.673845] RIP: 0010:[<ffffffff813efc7e>] [<ffffffff813efc7e>] __raid_recover_end_io+0x4ae/0x4d0
> > ...
> > [ 87.673845] Call Trace:
> > [ 87.673845] [<ffffffff8116bbc6>] ? mempool_free+0x36/0xa0
> > [ 87.673845] [<ffffffff813f0255>] raid_recover_end_io+0x75/0xa0
> > [ 87.673845] [<ffffffff81447c5b>] bio_endio+0x5b/0xa0
> > [ 87.673845] [<ffffffff81447cb2>] bio_endio_nodec+0x12/0x20
> > [ 87.673845] [<ffffffff81374621>] end_workqueue_fn+0x41/0x50
> > [ 87.673845] [<ffffffff813ad2aa>] normal_work_helper+0xca/0x2c0
> > [ 87.673845] [<ffffffff8108ba2b>] process_one_work+0x1eb/0x530
> > [ 87.673845] [<ffffffff8108b9c9>] ? process_one_work+0x189/0x530
> > [ 87.673845] [<ffffffff8108c15b>] worker_thread+0x11b/0x4f0
> > [ 87.673845] [<ffffffff8108c040>] ? rescuer_thread+0x290/0x290
> > [ 87.673845] [<ffffffff810939c4>] kthread+0xe4/0x100
> > [ 87.673845] [<ffffffff810938e0>] ? kthread_create_on_node+0x220/0x220
> > [ 87.673845] [<ffffffff817e7c7c>] ret_from_fork+0x7c/0xb0
> > [ 87.673845] [<ffffffff810938e0>] ? kthread_create_on_node+0x220/0x220
> >
> > -------------------
> >
> > It's because that we miscalculate @rbio->bbio->error so that it doesn't
> > reach maximum of tolerable errors while it should have.
> >
> > Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
> > ---
> > fs/btrfs/raid56.c | 5 +++--
> > 1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
> > index 4055291..4a88f07 100644
> > --- a/fs/btrfs/raid56.c
> > +++ b/fs/btrfs/raid56.c
> > @@ -1956,9 +1956,10 @@ static int __raid56_parity_recover(struct btrfs_raid_bio *rbio)
> > * pages are going to be uptodate.
> > */
> > for (stripe = 0; stripe < bbio->num_stripes; stripe++) {
> > - if (rbio->faila == stripe ||
> > - rbio->failb == stripe)
> > + if (rbio->faila == stripe || rbio->failb == stripe) {
> > + atomic_inc(&rbio->bbio->error);
> > continue;
> > + }
> >
> > for (pagenr = 0; pagenr < nr_pages; pagenr++) {
> > struct page *p;
> >
>
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