On Fri, Sep 01, 2017 at 09:52:18AM +0300, Amir Goldstein wrote: > [CC list, Ted] > > On Thu, Aug 31, 2017 at 11:54 PM, Josef Bacik <josef@xxxxxxxxxxxxxx> wrote: > > On Thu, Aug 31, 2017 at 05:02:46PM +0300, Amir Goldstein wrote: > >> On Thu, Aug 31, 2017 at 4:43 PM, Josef Bacik <josef@xxxxxxxxxxxxxx> wrote: > >> > On Thu, Aug 31, 2017 at 03:48:44PM +0300, Amir Goldstein wrote: > >> >> > >> >> Josef, > >> >> > >> >> I am at lost with these log corruptions. > >> >> I see log entry bios submitted and log_end_io report success, > >> >> but then in the log I see old data on disk where that entry should be. > >> >> This happens quite randomly and I assume it also happens on > >> >> logged data, because tests sometime fail on checksum on ext4. > >> >> > >> >> Mean while I added some more log entry sanity checks and debug > >> >> prints to replay-log to debug the corruption: > >> >> https://github.com/amir73il/xfstests/commit/bb946deb0dc285867be394613ddb19ce281392cc > >> >> > >> >> This only happens to me when running in kvm, so maybe something > >> >> with the virtio devices is fishy. > >> >> > >> >> Anyway, I ran out of time to work on this for now, so if you have > >> >> any ideas and/or time to test this issue, let me know. > >> >> > >> > > ... > >> > > > > Alright I tested it and it's working fine for me. I'm creating three lv's and > > then doing > > > > -drive file=/dev/mapper/whatever,format=raw,cache=none,if=virtio,aio=native > > > > And I get /dev/vd[bcd] which I use for my test/scratch/log dev and it works out > > fine. What is your -drive option line and I'll duplicate what you are doing. > > Thanks, > > > > I am using Ted's kvm-xfstests, so this is the qemu command line: > https://github.com/tytso/xfstests-bld/blob/master/kvm-xfstests/kvm-xfstests#L104 > > The only difference in -drive command is no aio=native. > BINGO! when I add aio-native there are no more log corruptions :) > Please try to use aio=threads to see if you also get log corruptions. > > Thing is we cannot change kvm-xfstests to always use aio=native because > it is not recommended for sparse images: > https://access.redhat.com/articles/41313 > I will try to work something out so that kvm-xfstest will use aio=native > when using the recommended (by not default) LV setup. > > However, why would aio=threads cause log corruption? > Does it indicate a bug in kvm-qemu or in dm-log-writes?? So I've been running this in a loop all day with aio=threads and it's not blowing up. This is my qemu version QEMU emulator version 2.9.0(qemu-2.9.0-1.fb1) Maybe it has to do with the version of qemu? Thanks, Josef -- To unsubscribe from this list: send the line "unsubscribe fstests" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
