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Latest rhel6 compose with the -26 kernel hangs on boot at "Starting plymouth daemon" when booting as a Xen guest.

Guest details: x86_64 PV guest on rhel5.5 host. Host is using LVM for disk image.

Last boot messages:


Write protecting the kernel read-only data: 7196k
dracut: dracut-004-19.el6
dracut: rd_NO_LUKS: removing cryptoluks activation
dracut: rd_NO_LVM: removing LVM activation
device-mapper: uevent: version 1.0.3
device-mapper: ioctl: 4.17.0-ioctl (2010-03-05) initialised: dm-devel
udev: starting version 147
dracut: Starting plymouth daemon

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

This is more likely to be a udev-triggered kernel issue. If you try passing 'udevdebug' to the kernel command line, do you get more inforimation?

Opening grub.conf to add the parameter I saw the problem isn't udev either. The problem is simply that the kernel's rpm script didn't grab the console params from the other kernels (console=tty0 console=hvc0).  So the boot didn't hang, it just stopped outputting. I just 'rpm -e'-ed the kernel and redid the rpm -ivh with the same rpm, and now the console params are there. I don't know what happened, but anyway, long story short, closing as NOTABUG.