ASSERT unix/os.c:8887 check_start == dynamo_dll_start && check_end == dynamo_dll_end

This happened once on Travis 64-bit Linux. On a re-run it did not repro:

```
Start 84: code_api|linux.fib-conflict
89/303 Test #84: code_api|linux.fib-conflict ..................................***Failed Required regular expression not found.Regex=[^fib\(5\)=8
fib\(15\)=987
fib\(25\)=121393
fib\(0\)=1
fib\(1\)=1
fib\(2\)=2
fib\(3\)=3
fib\(4\)=5
fib\(5\)=8
fib\(6\)=13
fib\(7\)=21
fib\(8\)=34
fib\(9\)=55
fib\(10\)=89
fib\(11\)=144
fib\(12\)=233
fib\(13\)=377
fib\(14\)=610
fib\(15\)=987
fib\(16\)=1597
fib\(17\)=2584
fib\(18\)=4181
fib\(19\)=6765
fib\(20\)=10946
fib\(21\)=17711
fib\(22\)=28657
fib\(23\)=46368
fib\(24\)=75025
fib\(25\)=121393
fib\(26\)=196418
fib\(27\)=317811
fib\(28\)=514229
fib\(29\)=832040
fib\(30\)=1346269
fib\(31\)=2178309
fib\(32\)=3524578
fib\(12\)=233
$
] 0.00 sec

```