i have seen many times the given error, there was no log about error. Beside this my machine never uses swap i realize that when i have last 500 Mb ram it get this error and after using 5Gb of 8 Gb it decreasing like plane crash :) I've found this form and it is the same with my error : http://www.webhostingtalk.com/showthread.php?t=913156 There could be a hardware problem i am not sure , i see this error at least one time in a day. Do you have an advice ? unluckeyly i have found only one people who has the same error with me :) and his machine is also same with mine :D -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20100427/dc972bfb/attachment-0002.html>