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Version-Release number of selected component (if applicable): 4.5.0-302.fc24.x86_64 not affected: all F23 kernels up to 4.4.6-301 How reproducible: on every boot on multiple systems with similar layout: / is a btrfs partition in a LUKS container on a SSD Steps to Reproduce: 1. have a system with btrfs on a LUKS container 2. boot 3. watch kernel output, journalctl or dmesg Actual results: I'm seeing a scary error message: `BTRFS error (device dm-0): could not find root 8` Expected results: No error message if nothing is wrong. In case something is wrong I Additional info: See also: https://www.spinics.net/lists/linux-btrfs/msg49600.html – this looks like an unnecessary error message with nothing being wrong.
This isn't a regression. It is a new error message, and as you have pointed out you can ignore it.
*********** MASS BUG UPDATE ************** We apologize for the inconvenience. There is a large number of bugs to go through and several of them have gone stale. Due to this, we are doing a mass bug update across all of the Fedora 24 kernel bugs. Fedora 24 has now been rebased to 4.7.4-200.fc24. Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel. If you have moved on to Fedora 25, and are still experiencing this issue, please change the version to Fedora 25. If you experience different issues, please open a new bug report for those.
This issue is not present any more with 4.7.4 or newer. In fact it is gone since updating from 4.5.4-300.fc24.x86_64 to 4.5.5-300.fc24.x86_64. See also: https://btrfs.wiki.kernel.org/index.php?title=Changelog#v4.6_.28May_2016.29 , probably packported to 4.5.4 from 4.6 release.