We had this quiet rare flaky behaviour with this test, and the error message was this one:
aio short write (16384)
So, once improved this error message, the new error message was:
aio short write: got 16384, expected: 131584 (max_buf_aio=256, iovcnt=257)
To reproduce easly:
Now, ```
$ sudo sysctl vfs.aio.max_buf_aio=256
vfs.aio.max_buf_aio: 16 -> 256
$sudo kyua test sys/aio/aio_test:vectored_big_iovcnt
```
But remember: There is nothing in the standard aio tests that is modifing the default value.