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Created attachment 1217081 [details] Dracut_error_message.png Description of problem: On kernel-4.8.4-200 the system can't be booted with a thinLV on a RAID1 LVM thinPool. When a machine has this kernel and raid, it stays in Dracut and after some time it will print: device-mapper: table: 253:5 raid: Unable to assemble array: Unknown flag(s) in compatible feature flags This happens at least after update from kernel 4.7.3-200 to kernel 4.8.4-200 or after installation of Fedora24. I didn't test it but I assume that this is happening on every Fedora version with this kernel. Version-Release number of selected component (if applicable): 2.02.150-2 How reproducible: Always Steps to Reproduce: 1. Create partitioning with a thinLV on a RAID1 thinPool 2. Start F24 installation and use this pre-created partitioning for '/' (root mountpoint) 3. Run installation with actual repositories 4. Reboot or: 1. Same as 1. above 2. Install F24 from install repositories http://dl.fedoraproject.org/pub/fedora/linux/releases/24/Everything/x86_64/os/ (to have old kernel version) 3. Install the system and boot to it 4. Run dnf upgrade 5. Reboot Actual results: When the installation/upgrade is finished and the machine is rebooted it won't boot to a system. Expected results: The machine should boot successfully. Additional info: I'm attaching a screenshot with the Dracut error. It looks like this is specific to thinPool RAID and this is not happening on a software md RAID.
The issue is more generic and widespread: ANY raid volume fails to be assembled by kernel >=4.8 . Here you can find a 3d with a patch for the issue: http://www.spinics.net/lists/raid/msg53981.html
Already fixed upstream and released in recent Fedora 24 kernels.