Hi, I've just uploaded my upstream queue that mostly deals with the various races I found in the domain migration code.
One of my concerns raised earlier turned out to be for no reason: We do not allow Linux to wake up a task that has TASK_ATOMICSWITCH set. So the deletion race can indeed be fixed by the patch I sent earlier. However, we do not synchronize setting and testing of TASK_ATOMICSWITCH (because we cannot hold the rq lock), thus we still face a small race window that allows premature wakeups, at least in theory. That's now addressed by patch 3. Besides another race around set/clear_task_nowakeup, there should have been a window during early migration to RT where we silently swallowed Linux signals. Closed by patch 4, hopefully also fixing our spurious gdb lockups on SMP boxes - time will tell. Please review carefully. Jan
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