RHEL6: hung_task message or machine hangs with processes blocked in md_write_start()
Issue
- RHEL6 system hung and hung_task message at md_write_start()
Environment
- Red Hat Enterprise Linux server 6
- seen on kernel-2.6.32-220.13.1.el6
- other kernels up to RHEL6.5 (kernel-2.6.32-431.el6) likely affected
- mdraid
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