Hi, The following two patches are designed to make the task freezer SMP-safe. The first patch is a controversial one, as Pavel doesn't like it, but I have no other idea how the freezing of stopped tasks could be handled to avoid the problems that it has now. I did my best to explain everything in the changelog. The second patch is basically needed to make the freezer avoid races with other tasks when modifying the other tasks' flags. Greetings, Rafael -- You never change things by fighting the existing reality. R. Buckminster Fuller