Fedora Users — [spr29779] setuid weirdness

On FC2 and FC3, I'm having a problem with my custom application that wants to run setuid. This problem does not occur under FC1 (2.4 kernel) or under Suse (2.6.10 kernel). Admittedly, this is an unusual error message, but perhaps it will mean something to someone here. When I run the app, I get

# ./myapp
couldn't open process map file
Unable to locate enough free space to restore C heap
Could not restore the image file:
    /home/luser/myapp/myapp.dxl.

The particular application is compiled under Allegro Common Lisp, a popular lisp development environment from commercial vendor Franz, Inc. I've been trying debug this with the help of Kevin Layer, a Franz developer, but we've had no luck. Our latest hypothesis is that there's been some sort of Redhat change to the kernel in the way /proc handles setuid processes, but at this point we need the advice of someone with Redhat expertise.

Here's my original problem report:
http://article.gmane.org/gmane.lisp.allegro/269

Here's an strace:
http://article.gmane.org/gmane.lisp.allegro/271

Here's the rest of the discussion:
http://article.gmane.org/gmane.lisp.allegro/285

Thanks in advance for any insights.