Hello, in 5.16, due to (afaict) adad556efcdd ("crypto: api - Fix built-in testing dependency failures") booting a system with cryptmgr.ko not (perhaps manually) put in the initrd doesn't work when ext4.ko is responsible for / . I've contacted Herbert already after finding this issue with btrfs, but in the case of ext4 another aspect plays into it: I've observed the problem on a system where ext4.ko is used solely to service ext3 partitions (including / ), but aiui crc32c isn't used at all in this case. Yet it's the attempt of loading it which actually causes the mount (and hence booting) to fail. If my understanding is correct, wouldn't it make sense to skip the call to crypto_alloc_shash() unless an ext4 superblock is being processed? Thanks, Jan