System crashed due to a NULL memory reference occurred in the IO completion code path radix_tree_tag_clear+0x14

Solution Unverified - Updated -

Issue

  • System hang/crashed due to a NULL memory reference occurred in the IO completion code path.
  • High load average, D-state.

Environment

  • Red Hat Enterprise Linux 6
  • Kernel-2.6.32-642.6.2.el6
  • HP-ProLiant BL460c-Gen8

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