Keir Fraser wrote: > On 26/9/06 7:31 pm, "Ed Smith" wrote: > >> Debug builds are fine and certainly easier to well, debug with, but they often >> run slower than release builds and hide problems. Humm... I wonder if thats >> why you are not seeing this problem. > > It is usually the other way round, since debug builds contain lots of cross > checks and assertions that are not included in production builds. Certainly > a few bugs do only crop up in production builds, and so we test both types > of builds ourselves, but it's rare and the first thing we'll do if we see a > production-build crash is to try and repro with a debug build. This must be one of those rare ones ;') Debug build works, release build fails. I did a 64bit XEN debug build and tried booting 64bit RHEL4U2 2CPU 256MB HVM guest and it boots fine. I then did a 64bit XEN release build and tried booting the same guest and I crash in vmx.c:2268. dom0 console output for both debug and release builds is attached. This is c/s 11616. Cheers, Ed