On 10/08/2015 at 08:21 PM, Andreas Hartmann wrote: > Am 08.10.2015 um 18:39 schrieb Joerg Roedel: >> On Wed, Oct 07, 2015 at 06:52:58PM +0200, Andreas Hartmann wrote: >>> To reproduce the error: >>> First I mounted /daten2, afterwards /raid/mt, which produces the errors. >>> The ssd mounts have been already active (during boot by fstab). >> >> Okay, I spent the day on that problem, and managed to reproduce it here >> on one of my AMD IOMMU boxes. I wasn't an easy journey, as I can only >> reproduce it if I setup the crypto partition and everything above that >> (like mounting the lvm volumes) _after_ the system has finished booting. >> If everything is setup during system boot it works fine and I don't see >> any IO_PAGE_FAULTS. > > Thank you very much for spending so much of your time to reproduce the > problem! > >> I also tried kernel v4.3-rc4 first, to have it tested with a >> self-compiled kernel. It didn't show up there, so I built a 4.1.0, where >> it showed up again. Something seems to have fixed the issue in the >> latest kernels. >> >> So I looked a little bit around at the commits that were merged into the >> respective parts involved here, and found this one: >> >> 586b286 dm crypt: constrain crypt device's max_segment_size to >> PAGE_SIZE >> >> The problem fixed with this commit looks quite similar to what you have >> seen (execpt that there was no IOMMU involved). So I cherry-picked that >> commit on 4.1.0 and tested that. The problem was gone. > > That's true - I already knew this patch and tested it some weeks ago - > unfortunately it doesn't fix the problem here. > > To be really sure, I just retested it now again. I couldn't see any > IO_PAGE_FAULTS errors today (unfortunately I can't remember anymore if I > didn't see them too a few weeks ago) - but the ata errors remain. > Therefore, this patch isn't a solution for the problem I encounter here. > >> So it looks like it was a dm-crypt issue, the patch went into v4.3-rc3, >> either this kernel of rc4 should fix the problem for you too. Can you >> please verify this is fixed for you too with v4.3-rc4? > > As I already wrote, I even couldn't see the problem with v4.3-rc2 any > more (as far as I was able to test because of the other problem). I have > to do some more tests now with this kernel to be really sure. I now tested w/ v4.3-rc4. I couldn't see any IO_PAGE_FAULTS but the ata errors remain. The ata errors can be easily activated by copying a large file (> 4 GB) from one partition on the raid to another partition on the raid. Thanks, Andreas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
