Uninterruptible sleep + High load average + System unresponsive

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http://www.linuxquestions.org – I have 3 systems which are showing following behavior 1) A regularly scheduled process goes into un-interruptible sleep. 2) Subsequent launches of same process stay in "R" state but are not doing anything. 3) Load average starts growing. 4) System becomes unresponsive and needs to be rebooted. I need help in trying to find what the resource is the process going into uninterruptible sleep on. I cannot attach debugger, run strace or kill it. So I don't have visibility what the process is doing. Logs don't indicate any crashes or pending operations. Any help is much appreciated. (HowTos)