RHEL6: kdump on a system with many LUNs never finishes, or shows "soft lockups"

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Issue

kdump on a system with many LUNs never finishes, or shows "soft lockups". On the main kernel, I was hitting soft lockups and had to limit udevchilds and/or udevtimeout to solve this, as described in udevd worker unexpectedly returned with status 0x0100.

Environment

Red Hat Enterprise Linux (RHEL) 6
kdump
many luns

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