2.2.16 Kernel panic when booting into RHCK on a Btrfs root partition

If the root partition is formatted by using Btrfs, the system is unable to boot into RHCK. This problem occurs because the features that are included in the version of Btrfs provided are not supported on older kernel versions. Note that Btrfs is included onl.y as a technology preview for RHCK and is not fully supported on this kernel.

However, Btrfs is fully supported in production with the UEK release. Systems that boot into this kernel are unaffected by this particular issue.

When formatting file systems from the installation ISO, be aware that formatting the root partition with Btrfs makes it impossible to boot into the RHCK. Note that btrfs is the default file system for system disks when using the boot-uek.iso. If you are installing from this ISO and you intend to use the RHCK, you must change the default system disk layout in the installer. (Bug ID 23198167)