Hi, I was using kernel-2.6.18-164.15.1 with no known issues. Then, I updated to: Linux 2.6.18-194.17.1.el5 #1 SMP Wed Sep 29 12:50:31 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux I'm aware that there are later updates that patch couple more security bugs. Here is an issue I run with 2.6.18-194.17.1 and am asking if anyone hits that kernel bug. Here are the symptoms: 1) kswapd1 running at 100%, there are not much paging 2) when i logged in, root can't kill -9 ANY processes 3) memory is used up, swap is probably only used up for couple hundred MBs at most (Swap space has couple Gig available) I saw in the logs: kernel: INFO: task sadc:23936 blocked for more than 120 seconds. kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Annoyingly, I failed to reproduce the issues. I tried to reproduce it with the "stress" software package, using up CPU, memory, etc. But I failed to reproduce those. Reading later release of kernel did not mention this bug. If anyone can contribute to what is happening here, that would be great. Thanks