preadv(0, 0xb7ed7000, 42, 0) = -1 EFAULT (Bad address)
preadv(0, [{iov_base="01234567", iov_len=8}], 1, 0) = 8
 * 8 bytes in buffer 0
 | 00000  30 31 32 33 34 35 36 37                           01234567         |
preadv(0, [{iov_base="89abcde", iov_len=8}, {iov_base="", iov_len=15}], 2, 8) = 7
 * 7 bytes in buffer 0
 | 00000  38 39 61 62 63 64 65                              89abcde          |
+++ exited with 0 +++
