On Mon, May 31, 2010 at 01:28:17PM +0200, Christof Schmitt wrote: > When running tests with an ext2 filesystem on a device using DIF/DIX > integrity data, i sometimes see invalid guard tags on write requests. > To track down the problem, i patched the function sd_prep_fn in sd.c > to verify the IP checksums in the guard tags against the actual data. > Sometimes there is a mismatch and the write request fails when the HBA > checks the guard tag. > > Since the guard tags are created in Linux, it seems that the data > attached to the write request changes between the generation in > bio_integrity_generate and the call to sd_prep_fn. > > Using ext3 or ext4 instead of ext2 does not show the problem. > > There is a bugzilla open at Redhat with the same symptom, but there is > no data or activity: > https://bugzilla.redhat.com/show_bug.cgi?id=574266 > > What would be the best way to track down this problem? One more thing: The test is running with a 2.6.34 kernel, the problem in the bugzilla is reported for 2.6.33. Christof Schmitt -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
