Hello! On 02/06/2014 04:27 PM, Robert Heller wrote: > I just updated my quad-processor X64 machine (AMD Phenom(tm) II X4 945 > Processor) to the latest CentOS 5 xen kernel (2.6.18-371.4.1.el5xen) and I am > getting occasional "BUG: soft lockup - CPU#n stuck for X s! [swapper:0]" > messages. I did some net searching, and found some bugzilla reports > (https://bugzilla.redhat.com/show_bug.cgi?id=649519 and > http://bugs.centos.org/view.php?id=4488), but neither are shown as resolved. > The machine *seems* to be running alright (it is not hanging or anything). Is > this something I need to worry about? Should I revert to the older kernel > (2.6.18-371.3.1.el5xen)? This is NOT happening on my single-processor 32-bit > laptop (running 2.6.18-371.4.1.el5). I remember this problem a while ago, in our case it was related to the network card driver. But in our case the system actually crashed with kernel panic. What if you try to boot your system with acpi=off? Cheers, Barbara