I agree - if malloc does not fail there is not much you can do.
However, I believe that malloc may be failing in this case.

I think you should fix all of the following bugs and then
re-check the behavior of this test case (especially 13714):

13714    Many calls to `epush' in runtime do not check for failure
13690    Multiple unchecked memory allocations in run-time
13752    Compute_eif_type_id returns 0 if memory allocation failure
14586    Eget may return too small area if `extend' has to get urgent chunk
14585    Exget can return address past end of chunk if stack_extend has to get urgent chunk
14581    Last urgent chunk cannot be used