posix_memalign(16, 16384) failed (12: Cannot allocate memory)

[JohnCarne]

No error after 24 hours now, nginx version without modules was 1 part of the
solution

Now I tweak aio nginx with this :
directio_alignment 4k;

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,269787,269843#msg-269843