Hi,
I used yum update to apply the usual security patches and a kernel update
was downloaded and applied. The kernel moved from 2.6.18-238.19.1.el5 to
2.6.18-274.7.1.el5 When I rebooted the boot failed as it could not unlock
the encrypted root partition. Previous kernels can still unlock the disk and
boot successfully.

The machine is a Dell D820 Laptop.

Prior to the request for a LUKS passphrase I see insmod errors for
padlock.ko but these have not caused problems before and appear for both
kernels.
After entering the passphrase I get:-

device-mapper: table: 253:0: crypt: Error allocating crypto tfm
Failed to setup dm-crypt key mapping
Check kernel for support for aes-cbc-essiv:sha256 cipher spec and verify
that /dev/sda2 contains at least 133 sectors.
Failed to read from key storage.

Thanks

Paul