centos/rhel 6.x部分系统在运行208.5天后可能会重启

centos/rhel 6.x部分kernel版本由于计数器溢出的bug，208.5天后可能会造成kernel panic

https://rhn.redhat.com/errata/RHBA-2012-0124.html
Updated kernel packages that fix one bug are now available for Red Hat
Enterprise Linux 6.

The kernel packages contain the Linux kernel, the core of any Linux operating
system.

This update fixes the following bug:

* An insufficiently designed calculation in the CPU accelerator in the previous
kernel caused an arithmetic overflow in the sched_clock() function when system
uptime exceeded 208.5 days. This overflow led to a kernel panic on the systems
using the Time Stamp Counter (TSC) or Virtual Machine Interface (VMI) clock
source. This update corrects the aforementioned calculation so that this
arithmetic overflow and kernel panic can no longer occur under these
circumstances. (BZ#781974)

All users are advised to upgrade to these updated packages, which fix this bug.
The system must be rebooted for this update to take effect.

参考:
http://hi.baidu.com/beibeiboo/blog/item/90a5d3ec8f41570762d09f89.html