Re: [PATCH] xfs: Test infinite loop while searching for a free inode slot

["Darrick J. Wong" <darrick.wong@oracle.com>]

On Wed, Aug 16, 2017 at 03:31:59PM +0800, Eryu Guan wrote:
> On Wed, Aug 16, 2017 at 03:02:14PM +0800, Eryu Guan wrote:
> > > +
> > > +_scratch_unmount
> > > +
> > > +# agi->freecount is 0 here, corrupt it to show extra free inodes
> > > +$XFS_DB_PROG -x -c "agi 0" -c "write -d freecount 10" $SCRATCH_DEV >/dev/null 2>&1
> > 
> > redirect stdout and stderr to $seqres.full for debug purpose
> 
> And you can use _scratch_xfs_db wrapper instead of open coded xfs_db
> command.
> 
> And I found that "write -d" failed on a crc=0 XFS, though "write -c"
> allows corrupted data and bad CRC, but touch couldn't reproduce the hang
> in this case, because kernel detected bad crc first and aborted inode
> creation.

What error did you get, specifically?

Sounds more like a bug in write/fuzz -d to me. :)

--D

> 
> I think we can force a CRC enabled XFS by
> 
> _scratch_mkfs -m crc=1,finobt=0 >>$seqres.full 2>&1
> 
> Thanks,
> Eryu
> --
> To unsubscribe from this list: send the line "unsubscribe fstests" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html