[RHEL5] Many processes changed to uninterruptible state and system hanged. - Red Hat Customer Portal

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Issue

Our customer encountered a problem that cluster software performed shutdown due to detection of a server hang(high load).
We found that kswapd and rysnc changed to uninterruptible state a little before hang-up and that load average went up at the same time. We guess that this problem corresponds to following BZ, but it is not cirtain yet.
Bug 609668 - kswapd hung in D state with fragmented memory and large order allocations

https://bugzilla.redhat.com/show_bug.cgi?id=609668

Environment

Red Hat Enterprise 5.3

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