[Bug 75881] New: lazyinit failure on new mdadm raid5 & encrypted array

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=75881

            Bug ID: 75881
           Summary: lazyinit failure on new mdadm raid5 & encrypted array
           Product: File System
           Version: 2.5
    Kernel Version: 3.13.10
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
          Assignee: fs_ext4@kernel-bugs.osdl.org
          Reporter: thomas_reardon@hotmail.com
        Regression: No

Created attachment 135751
  --> https://bugzilla.kernel.org/attachment.cgi?id=135751&action=edit
kernel log, ext4 fs params

ext4 lazyinit fails with corruption when competing with mdadm raid5
reconstruction.  In the _default_ scenario, mdadm doesn't initialize a new
raid5 array but rather leaves the last drives as a rebuilding spare, rather
than a full initialization.

Adding to the load, the volume was an encrypted LUKS volume (at
/dev/mapper/private)

So the order of events:
1) create new 4x4TB RAID5 array via mdadm.  volume is started degraded and
starts rebuilding while allowing access.
2) layer new encrypted LUKS volume: /dev/md1 -> /dev/mapper/private
3) create EXT4 volume with 64bit,sparse_super2,
4) mount volume with journal_async_commit
5) a slow rsync is started in background, averaging 5MB/s

Please see attached

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