I keep getting these error messages in the main error_log that I can't figure out. I've looked up the IP's and 99.9% of them are in Japan. My site is a simple Wordpress blog about my 3-yr-old son, which maybe 10 people visit. I don't know anyone in Japan. These errors are constant, and I'd just like to know what's going on. Thanks...

Code:
[Mon Mar 15 10:30:35 2010] [error] [client 124.209.229.235] Premature end of script headers: feedget.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=haru_suki [Mon Mar 15 10:30:35 2010] [error] [client 124.209.229.235] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=haru_suki [Mon Mar 15 10:30:35 2010] [error] [client 124.209.229.235] Premature end of script headers: 500.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=haru_suki [Mon Mar 15 10:30:35 2010] [error] [client 119.30.218.80] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=hozondojo [Mon Mar 15 10:30:35 2010] [error] [client 119.30.218.80] Premature end of script headers: feedget.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=hozondojo [Mon Mar 15 10:30:35 2010] [error] [client 119.30.218.80] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=hozondojo [Mon Mar 15 10:30:35 2010] [error] [client 119.30.218.80] Premature end of script headers: 500.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=hozondojo [Mon Mar 15 10:30:35 2010] [error] [client 61.197.159.158] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=tanishim [Mon Mar 15 10:30:35 2010] [error] [client 61.197.159.158] Premature end of script headers: feedget.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=tanishim [Mon Mar 15 10:30:35 2010] [error] [client 123.220.40.63] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable [Mon Mar 15 10:30:35 2010] [error] [client 123.220.40.63] Premature end of script headers: feedget.php [Mon Mar 15 10:30:35 2010] [error] [client 61.197.159.158] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=tanishim [Mon Mar 15 10:30:35 2010] [error] [client 61.197.159.158] Premature end of script headers: 500.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=tanishim [Mon Mar 15 10:30:35 2010] [error] [client 122.135.169.15] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=NicoWatchMember [Mon Mar 15 10:30:35 2010] [error] [client 122.135.169.15] Premature end of script headers: feedget.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=NicoWatchMember [Mon Mar 15 10:30:35 2010] [error] [client 210.175.50.37] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=torimaruru [Mon Mar 15 10:30:35 2010] [error] [client 210.175.50.37] Premature end of script headers: feedget.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=torimaruru [Mon Mar 15 10:30:35 2010] [error] [client 123.220.40.63] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable [Mon Mar 15 10:30:35 2010] [error] [client 123.220.40.63] Premature end of script headers: 500.php [Mon Mar 15 10:30:35 2010] [error] [client 122.135.169.15] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=NicoWatchMember [Mon Mar 15 10:30:35 2010] [error] [client 122.135.169.15] Premature end of script headers: 500.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=NicoWatchMember [Mon Mar 15 10:30:35 2010] [error] [client 210.175.50.37] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=torimaruru [Mon Mar 15 10:30:35 2010] [error] [client 210.175.50.37] Premature end of script headers: 500.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=torimaruru [Mon Mar 15 10:30:36 2010] [error] [client 218.43.239.5] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=nyupy [Mon Mar 15 10:30:36 2010] [error] [client 218.43.239.5] Premature end of script headers: feedget.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=nyupy [Mon Mar 15 10:30:36 2010] [error] [client 218.43.239.5] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=nyupy [Mon Mar 15 10:30:36 2010] [error] [client 218.43.239.5] Premature end of script headers: 500.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=nyupy [Mon Mar 15 10:30:36 2010] [error] [client 220.97.254.42] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=nyupy [Mon Mar 15 10:30:36 2010] [error] [client 220.97.254.42] Premature end of script headers: img_view.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=nyupy [Mon Mar 15 10:30:36 2010] [error] [client 220.97.254.42] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=nyupy [Mon Mar 15 10:30:36 2010] [error] [client 220.97.254.42] Premature end of script headers: 500.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=nyupy [Mon Mar 15 10:30:36 2010] [error] [client 220.49.134.100] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=ebisuakie [Mon Mar 15 10:30:36 2010] [error] [client 220.49.134.100] Premature end of script headers: feedget.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=ebisuakie [Mon Mar 15 10:30:36 2010] [error] [client 220.49.134.100] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=ebisuakie [Mon Mar 15 10:30:36 2010] [error] [client 220.49.134.100] Premature end of script headers: 500.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=ebisuakie [Mon Mar 15 10:30:36 2010] [error] [client 211.13.10.62] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=hanyakko [Mon Mar 15 10:30:36 2010] [error] [client 211.13.10.62] Premature end of script headers: feedget.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=hanyakko [Mon Mar 15 10:30:36 2010] [error] [client 211.13.10.62] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=hanyakko [Mon Mar 15 10:30:36 2010] [error] [client 211.13.10.62] Premature end of script headers: 500.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=hanyakko [Mon Mar 15 10:30:37 2010] [error] [client 114.185.248.244] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=kebihabi [Mon Mar 15 10:30:37 2010] [error] [client 114.185.248.244] Premature end of script headers: feedget.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=kebihabi [Mon Mar 15 10:30:37 2010] [error] [client 114.185.248.244] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=kebihabi [Mon Mar 15 10:30:37 2010] [error] [client 114.185.248.244] Premature end of script headers: 500.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=kebihabi [Mon Mar 15 10:30:37 2010] [error] [client 219.203.253.37] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable [Mon Mar 15 10:30:37 2010] [error] [client 219.203.253.37] Premature end of script headers: img_view.php [Mon Mar 15 10:30:37 2010] [error] [client 219.203.253.37] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable [Mon Mar 15 10:30:37 2010] [error] [client 219.203.253.37] Premature end of script headers: 500.php [Mon Mar 15 10:30:37 2010] [error] [client 59.171.53.137] SystemException in API_Linux.cpp:172: setuid() failed: Resource temporarily unavailable, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=jil0310 [Mon Mar 15 10:30:37 2010] [error] [client 59.171.53.137] Premature end of script headers: img_view.php, referer: http://www.duboot.com/lab/twitter/parts/twitter_parts.swf?ID=jil0310