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