It's rather too complex to explain the change here, so I suggest you go and read these first: http://permalink.gmane.org/gmane.comp.version-control.git/184205 http://permalink.gmane.org/gmane.comp.version-control.git/184209 https://bugzilla.redhat.com/show_bug.cgi?id=747377#c22 https://bugzilla.redhat.com/show_bug.cgi?id=747377#c24 Now, I'm _not_ saying that the glibc change is wrong. In fact, it enables extra gcc optimizations, which is great. But in this case it looks like we're going to have to review all use of thread mutexes in the whole of Fedora. Maybe not the kind of thing we had in mind for Fedora 16 at this point. I think it's great that Thomas Rast, Jim Meyering, and Jakub Jelinek found the problem after probably a couple of man-days of effort, but really development and bug fixing like this belongs in Rawhide. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://et.redhat.com/~rjones/virt-df/ -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel