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