This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release.
I just tried reproducing this both with 5.1 and a 5.2 nightly and couldn't make it happen. If you pass 'mem=256M vnc' among the boot parameters, we fall back to minstg2.img correctly and you'll see it try to start VNC, fail, and then go in to the text mode installer. There's a failure message indicating it can't start VNC and then automatically goes to the text mode installer. No tracebacks. Looks like we nabbed this one via other fixes. Closing this one.