esp 2.3.2 couldn't call tasks in other modules.
And sadly, the error message was:
Internal compiler error due to signal number 11 at or near line number 13 ... ESPCompiler ERROR.
As an example:
--------------------------------------------------
module dut;
initial top.all_done; // Works
initial all_done; // Doesn't work
endmodule
module top;
task all_done;
$finish;
endtask
dut dut ();
endmodule
--------------------------------------------------