When 'yum update' installs a new kernel package, it somehow accesses the floppy drive and CD or DVD drive. You can see the drive lights come on as the kernel package is installed (presumably from preinstall or postinstall scripts). If there is no disk in the floppy drive then logwatch afterwards reports an error from /dev/fd0. Normally this accessing of the drives is benign. However, if the CD drive has a CD that cannot be read for some reason (badly burned CD, or hardware failure) then this causes the kernel package install to hang, churning the CD drive. The disc cannot be ejected because the drive is busy. The only obvious way to stop this is to reboot the machine (which is not a safe thing to do halfway through a 'yum update'). I suggest that the kernel rpm installation scripts should not access the floppy drive, CD drive or other removable media as part of the installation.
The I/O should time out eventually. Sometimes it can take a long time...
Do you know the reason why installing a kernel even tries to access the removable media?
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