ASSERT tool.drcachesim.scattergather test: tracer.cpp:394: towrite <= ipc_pipe.get_atomic_write_size() && towrite > 0

tool.drcachesim.scattergather failed:

https://github.com/DynamoRIO/dynamorio/runs/5077131960?check_suite_focus=true

ASSERT FAILURE: /home/runner/work/dynamorio/dynamorio/clients/drcachesim/tracer/tracer.cpp:394: towrite <= ipc_pipe.get_atomic_write_size() && towrite > 0 ()

I don't remember ever seeing that assert before on any drcachesim test.