After upgrading to gentoo-sources-2.6.19-r5 I get an error message saying that the root device is not found, prompting me for a valid root device. If I type "shell", I find that the only content of /dev/evms is the "dm" dir. I use genkernel to compile the kernel and activate EVMS. Reproducible: Always Steps to Reproduce: Downgrading to gentoo-sources-2.6.18-r6 "solves" the problem.
Don't use make oldconfig and don't recycle old .configs between kernel versions. *** This bug has been marked as a duplicate of bug 161380 ***
Tried a second time, and this time I was doing a fresh install. Same result.
Attach your kernel .config and your bootloader configuration here, tell us which hardware and which driver are you using for your SATA/IDE/whatever, we can't guess.
Do you by any chance use sys-fs/evms for this?
Upgrading to sys-fs/evms-2.5.5-r5 before running genkernel solved the problem for me.