Just have my blog transfered from one host to another. Copy all the files and database, and all goes well. But I find there are many large files (more than 100M) in the wp-admin, named core.22222 (4 or 5 numbers).
Aften Google it, I know that core files are created automatically when a process corrupted in *nix. And the files naturally fall in the folder where the problem comes about.
And then I try every page of administration, found that every time I open index.php, the core file comes. I compare the index.php to other files such as link.php, plugin.php. I delete the lines where require includes/dashboard.php. Refresh the wp-admin/index.php, no core file is generated any more. Changed to the original files requiring includes/dashboard.php, the core files appare again.
If someone is troubled by the LARGE core files, you just need to delete several lines in wp-admin/index.php, and the world become perfect again.
The dashboard.php is 30k, so I don't anlyze it. I'm not sure whether it's a BUG or just conflicts with my host setting.
Hope WP team will make it clear.
PS, here is my blog, it works fine now :p http://offmask.com