Problem with Simvision hanging in an endless loop

I have a problem with Simvision hanging in an endless loop. I encounter this problem from time to time probably since I use a lot of complicated always @(*) blocks. The problem occurs with two blocks that have some dependencies between them. However, it is not a combinatorial loop. I believe that it got something to do with the way that Simvision creates and updates its dependency tree. Usually, some "cosmetic" change, such as taking out a line and changing it to "assign ...", solves the problem. However, it is very difficult to find out which line causes the problem. I tried to reproduce a simple example below. I belive that it can be even simpler.

module endlessloop
(
 output reg c_cld
);

  parameter CREATE_ENDLESS_LOOP = 1; // =0 will not cause the endless loop

reg a;
reg b;
reg c;
reg d;
reg d_cld;

reg clk;
reg rst_l;

initial
begin
  clk = 1'b1;
  rst_l = 1'b0;
  #50 rst_l = 1'b1;
end

always
  #10 clk = ~clk;

always @(posedge clk or negedge rst_l)
begin
  if (~rst_l)
  begin
    c_cld <= 1'b0;
    d_cld <= 1'b0;
  end
  else
  begin
    c_cld <= c;
    d_cld <= ~d_cld;
  end
end

always @(*)
begin
  $display("%d; in 1",$time);
  if (CREATE_ENDLESS_LOOP)
  begin
    a = 1'b0;
    d = 1'b0;
  end

  a = b;
  d = d_cld;
end

always @(*)
begin
  $display("%d; in 2",$time);
  if (CREATE_ENDLESS_LOOP)
  begin
    c = 1'b0;
    b = 1'b0;
  end

  c = a;
  b = d;
end

endmodule // endlessloop