I can reproduce the issue now, and it is easy to trigger it via your test code on scsi device, but a bit difficult to get it on null_blk. Turns out it is a block core issue, and it is in bio_will_gap() which gets the last bvec via 'bi_io_vec[prev->bi_vcnt - 1]' directly. I have posted out one patchset for fixing the issue: http://marc.info/?l=linux-kernel&m=145551975429092&w=2
Thanks Ming! I'll give it a shot... -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
