mdadm can cause a deadlock with raid devices using a bitmap file

Solution Verified - Updated -

Issue

  • System hangs on spinlocks in dput and bitmap_endwrite from md_seq_show.
  • System hangs while reading /proc/mdstat

Environment

  • Red Hat Enterprise Linux 6.3 and earlier
  • Red Hat Enterprise Linux 5
  • mdadm MD RAID devices with a bitmap file

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