Re: [PATCH v2] generic: test I/O on dm error device

Dave Chinner
2016-03-23T02:53:57Z

On Tue, Mar 15, 2016 at 04:12:14PM +0800, Eryu Guan wrote:
> This is a test that performs simple I/O on dm error device, which
> returns EIO on all I/O request.
>
> This is motivated by an ext4 bug that crashes kernel on error path when
> trying to update atime. Following kernel patch should fix the issue
>
> ext4: fix NULL pointer dereference in ext4_mark_inode_dirty()
>
> Signed-off-by: Eryu Guan <eguan@redhat.com>
> ---

Fails with:

@@ -1,2 +1,6 @@
QA output created by 338
Silence is golden
+specified blocksize 1024 is less than device physical sector size 4096
+switching to logical sector size 512
+mkfs.xfs: /dev/mapper/error-test appears to contain an existing filesystem (xfs).
+mkfs.xfs: Use the -f option to force overwrite.

And then it failed to clean up properly and caused all sorts of
subsequent problems.

-Dave.
--
Dave Chinner
david@fromorbit.com