I've got an app now that I can reliably provoke into crashing under 2.6.9, but unfortunately it's our internal Remedy ticketing system. I'm running on FC3 and I've tried both Redhat's 2.6.9-1.667 kernel and a plain 2.6.9 I built from kernel.org.
There is a message in the log, but it may just be a failure handling the error, not the cause of the crash itself. err:seh:setup_exception stack overflow 644 bytes in thread 0009 eip 77ee762e esp 77830d7c stack 0x77830000-0x77930000