In debugging a very rare failure for random_directio, I've added a bunch of log_printf calls. Most are in random_directio itself, but there are a few inside the library and those need to be removed once the problem is resolved because they will affect any/all library users.

All of the library internal debugging is in os_posix/os_fs.c. Search for calls in that file to wt_log_printf and remove them when it is time.