Hi, David. I'm back in the saddle at home today and got a chance to look into this bug.
I've fixed it in the current utrace git/patch. I also committed it for the next rawhide kernel. I think rawhide mirrors are in f10-beta freeze, so you have to go to http://kojipkgs.fedoraproject.org/packages/kernel/2.6.27/ and check for when a build >= 2.6.27-0.343 arrives. One should be there before Tuesday morning, even if rawhide proper doesn't get updated. The bug was that the attach could leave the bookkeeping in a wrong state so that the utrace_control call would skip some flag-setting it needed to get the pending UTRACE_STOP to be noticed. To hack on the kernel you have, you can work around it with: set_thread_flag(TIF_NOTIFY_RESUME); after attach. That will be harmless on fixed kernels, though I wouldn't recommend leaving it in. Thanks, Roland
