[Bug 42763] directory access hangs without error

https://bugzilla.kernel.org/show_bug.cgi?id=42763

--- Comment #8 from Eric Buddington <ebuddington@wesleyan.edu>  2012-02-14 05:07:39 ---

I just discovered that one RAID drive has large and increasing SMART values for
Raw_Read_Error_Rate and Hardware_ECC_Recovered.

Apparently, any disk read errors are being recovered, since I'm not seeing any
errors in dmesg or /proc/mdstat - so I still think there's an ext4 problem
(though perhaps it takes a flooded queue and a very-slow-response disk to
trigger...)

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