sort-merge-fdlimit.log ( failed)

FAIL: tests/sort/sort-merge-fdlimit
===================================

12
11
16
4
13
15
14
9
5
1
7
17
3
2
8
10
6
sort: failed to open temporary file: Too many open files
FAIL tests/sort/sort-merge-fdlimit.sh (exit status: 1)