+ // no funny business: hold locks while we fork, otherwise if some
+ // other thread is holding a lock when the fork happens, the data
+ // structure protected by the lock will forever be in an
+ // inconsistent state in the child. See also #1391.
+ ACQUIRE_LOCK(&sched_mutex);
+ ACQUIRE_LOCK(&cap->lock);
+ ACQUIRE_LOCK(&cap->running_task->lock);
+