On Thu, Jun 02, 2016 at 09:10:01AM -0400, Brian Foster wrote:
> XFS had a bug in the multi-block buffer logging code that caused a NULL
> lv panic at log push time due to invalid regions being set in the buffer
> log format bitmap. This was demonstrated by modifying a multi-block
> directory buffer in a manner that only logs regions beyond the first
> FSB-sized mapping of the buffer.
>
> To recreate these conditions, this test fragments free space and
> populates several directories with enough entries to require
> discontiguous multi-block buffers. To recreate the problem, we remove
> entries from the tail end of the directory and fsync to flush the log.
>
> Note that this test causes a panic on kernels affected by the bug. As
> such, it is included in the 'dangerous' group. The bug is resolved by
> kernel commit a3916e528b91 ("xfs: fix broken multi-fsb buffer logging").
>
> Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
Looks good to me. Also tested on patched kernel with different block
size XFS, test passed within 20s for me.
Reviewed-by: Eryu Guan <eguan@xxxxxxxxxx>
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