This same problem causes my server to crash on the first Sunday of every
month.  The logs are attached.
Jan  4 01:06:01 grizzly kernel: [2176742.092908] md: data-check of RAID array 
md0
Jan  4 01:06:01 grizzly kernel: [2176742.092919] md: minimum _guaranteed_  
speed: 1000 KB/sec/disk.
Jan  4 01:06:01 grizzly kernel: [2176742.092922] md: using maximum available 
idle IO bandwidth (but not more than 200000 KB/sec) for data-check.
Jan  4 01:06:01 grizzly kernel: [2176742.092930] md: using 128k window, over a 
total of 16779776 blocks.
Jan  4 01:06:01 grizzly kernel: [2176742.106731] md: delaying data-check of md1 
until md0 has finished (they share one or more physical units)
Jan  4 01:06:01 grizzly kernel: [2176742.114936] md: delaying data-check of md2 
until md1 has finished (they share one or more physical units)
Jan  4 01:06:01 grizzly kernel: [2176742.118081] md: delaying data-check of md3 
until md2 has finished (they share one or more physical units)
Jan  4 01:06:01 grizzly kernel: [2176742.118331] md: delaying data-check of md1 
until md3 has finished (they share one or more physical units)
Jan  4 01:06:01 grizzly kernel: [2176742.118469] md: delaying data-check of md2 
until md0 has finished (they share one or more physical units)
Jan  4 01:06:01 grizzly kernel: [2176742.118600] md: delaying data-check of md3 
until md2 has finished (they share one or more physical units)


** Attachment added: "version.log"
   http://launchpadlibrarian.net/20909579/version.log

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RAID1 data-checks cause CPU soft lockups
https://bugs.launchpad.net/bugs/212684
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