Hello dann, or anyone else affected, Accepted mdadm into disco-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/mdadm/4.1-1ubuntu1.1 in a few hours, and then in the -proposed repository.
Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users. If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-disco to verification-done-disco. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-disco. In either case, without details of your testing we will not be able to proceed. Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping! N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days. ** Changed in: mdadm (Ubuntu Disco) Status: In Progress => Fix Committed ** Tags added: verification-needed-disco ** Changed in: mdadm (Ubuntu Bionic) Status: In Progress => Fix Committed ** Tags added: verification-needed-bionic -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1850540 Title: multi-zone raid0 corruption Status in Release Notes for Ubuntu: New Status in linux package in Ubuntu: Confirmed Status in mdadm package in Ubuntu: Fix Released Status in linux source package in Precise: New Status in mdadm source package in Precise: New Status in linux source package in Trusty: Confirmed Status in mdadm source package in Trusty: Confirmed Status in linux source package in Xenial: Confirmed Status in mdadm source package in Xenial: Confirmed Status in linux source package in Bionic: Confirmed Status in mdadm source package in Bionic: Fix Committed Status in linux source package in Disco: Confirmed Status in mdadm source package in Disco: Fix Committed Status in linux source package in Eoan: Confirmed Status in mdadm source package in Eoan: Fix Committed Status in linux source package in Focal: Confirmed Status in mdadm source package in Focal: Fix Released Status in mdadm package in Debian: Fix Released Bug description: Bug 1849682 tracks the temporarily revert of the fix for this issue, while this bug tracks the re-application of that fix once we have a full solution. [Impact] (cut & paste from https://marc.info/?l=linux-raid&m=157360088014027&w=2) An unintentional RAID0 layout change was introduced in the v3.14 kernel. This effectively means there are 2 different layouts Linux will use to write data to RAID0 arrays in the wild - the “pre-3.14” way and the “3.14 and later” way. Mixing these layouts by writing to an array while booted on these different kernel versions can lead to corruption. Note that this only impacts RAID0 arrays that include devices of different sizes. If your devices are all the same size, both layouts are equivalent, and your array is not at risk of corruption due to this issue. Unfortunately, the kernel cannot detect which layout was used for writes to pre-existing arrays, and therefore requires input from the administrator. This input can be provided via the kernel command line with the raid0.default_layout=<N> parameter, or by setting the default_layout module parameter when loading the raid0 module. With a new enough version of mdadm (>= 4.2, or equivalent distro backports), you can set the layout version when assembling a stopped array. For example: mdadm --stop /dev/md0 mdadm --assemble -U layout-alternate /dev/md0 /dev/sda1 /dev/sda2 See the mdadm manpage for more details. Once set in this manner, the layout will be recorded in the array and will not need to be explicitly specified in the future. (The mdadm part of this SRU is for the above support ^) [Test Case] = mdadm = Confirm that a multi-zone raid0 created w/ older mdadm is able to be started on a fixed kernel by setting a layout. 1) Ex: w/ old kernel/mdadm: mdadm --create /dev/md0 --run --metadata=default \ --level=0 --raid-devices=2 /dev/vdb1 /dev/vdc1 2) Reboot onto fixed kernel & update mdadm 3) sudo mdadm --assemble -U layout-alternate \ /dev/md0 /dev/vdb1 /dev/vdc1 4) Confirm that the array autostarts on reboot 5) Confirm that w/ new kernel & new mdadm, a user can create and start an array in a backwards-compatible fashion (i.e. w/o an explicit layout). 6) Verify that 'mdadm --detail /dev/md0' displays the layout = linux = Similar to above, but using kernel command line options. [Regression Risk] The kernel side of things will break starting pre-existing arrays. That's intentional. Although I've done due-diligence to check for backwards compatibility issues, the mdadm side may still present some. 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