= Verification = I see 2 pieces to this: 1) The original report, in Comment #1, where the offending patch caused an issue on a system where it shouldn't have - i.e., a raid0 w/ homogenous member sizes. We were never able to reproduce this in subsequent tests w/ the patch applied. I know sfeole was able to perform the same MAAS install/upgrade w/ the current -proposed kernel (I saw a test report from it), so I think we can confidently say it is not reproducible in that build either.
2) In configs where this patch *should* prevent a raid0 from assembling (heterogenous sizes), I've verified that if I create such an array on an older kernel, then upgrade to the current -proposed kernel, it starts automatically. Now, of course, I continue to be susceptible to corruption, but that's known and tracked in bug 1850540. $ cat /proc/version Linux version 4.15.0-66-generic (buildd@lgw01-amd64-044) (gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)) #75-Ubuntu SMP Tue Oct 1 05:24:09 UTC 2019 $ sudo mdadm --create /dev/md0 --run --metadata=default --homehost=akis --level=0 --raid-devices=2 /dev/vdb1 /dev/vdc1 mdadm: /dev/vdb1 appears to be part of a raid array: level=raid0 devices=2 ctime=Thu Oct 31 21:53:40 2019 mdadm: /dev/vdc1 appears to be part of a raid array: level=raid0 devices=2 ctime=Thu Oct 31 21:53:40 2019 mdadm: array /dev/md0 started. $ sudo reboot $ cat /proc/version Linux version 4.15.0-68-generic (buildd@lgw01-amd64-037) (gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)) #77-Ubuntu SMP Sun Oct 27 06:02:23 UTC 2019 $ cat /proc/mdstat Personalities : [raid0] [linear] [multipath] [raid1] [raid6] [raid5] [raid4] [raid10] md127 : active raid0 vdc1[1] vdb1[0] 1567744 blocks super 1.2 512k chunks unused devices: <none> -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1849682 Title: [REGRESSION] md/raid0: cannot assemble multi-zone RAID0 with default_layout setting To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1849682/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs