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Please: change TASK_SLOTS_STEP to 384 (ltask.c:49) and check again with N between 255 and 380. Tell me if the segfault is gone.
The segfaults seem to start at N == TASK_SLOTS_STEP.With TASK_SLOTS_STEP at 256, it works until N == 255, then segfaults. I set it to 384 and the segfaults start when N == 384. For N at 381, 382, 383 it all work fine.
I tried setting TASK_SLOTS_STEP to 443, and the behaviour was what you might expect: it worked up to 442 tasks and segfaulted from 443 and up.
Hope this helps.