Same problem with Ubuntu Trusty "Ubuntu 14.04.1 LTS" / kernel 3.13.0-32-generic.
Both NFS client and server run this version of Ubuntu and kernel version. 
Trying to transfer 500GB files from mdadm raid5 to NFS using lbzip2:

[48693.533918] INFO: task lbzip2:14344 blocked for more than 120 seconds.
[48693.536784]       Not tainted 3.13.0-32-generic #57-Ubuntu
[48693.539750] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[48693.542764] lbzip2          D ffff88011fc94440     0 14344  14341 0x00000000
[48693.542773]  ffff8800d235bb38 0000000000000002 ffff8801194497f0 
ffff8800d235bfd8
[48693.542782]  0000000000014440 0000000000014440 ffff8801194497f0 
ffff88011fc94cd8
[48693.542789]  ffff88011ffd3f28 0000000000000002 ffffffffa0219fe0 
ffff8800d235bbb0
[48693.542795] Call Trace:
[48693.542838]  [<ffffffffa0219fe0>] ? nfs_free_request+0xb0/0xb0 [nfs]
[48693.542851]  [<ffffffff817203fd>] io_schedule+0x9d/0x140
[48693.542877]  [<ffffffffa0219fee>] nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
[48693.542884]  [<ffffffff81720882>] __wait_on_bit+0x62/0x90
[48693.542908]  [<ffffffffa0219fe0>] ? nfs_free_request+0xb0/0xb0 [nfs]
[48693.542917]  [<ffffffff81720927>] out_of_line_wait_on_bit+0x77/0x90
[48693.542926]  [<ffffffff810aaf40>] ? autoremove_wake_function+0x40/0x40
[48693.542948]  [<ffffffffa021a383>] nfs_wait_on_request+0x33/0x40 [nfs]
[48693.542971]  [<ffffffffa021f2d0>] nfs_updatepage+0x150/0x650 [nfs]
[48693.542991]  [<ffffffffa021096b>] nfs_write_end+0x5b/0x340 [nfs]
[48693.543000]  [<ffffffff8114e616>] generic_file_buffered_write+0x156/0x250
[48693.543009]  [<ffffffff8114fc81>] __generic_file_aio_write+0x1c1/0x3d0
[48693.543016]  [<ffffffff8114fee8>] generic_file_aio_write+0x58/0xa0
[48693.543036]  [<ffffffffa020fbdb>] nfs_file_write+0xbb/0x1d0 [nfs]
[48693.543043]  [<ffffffff811bc3da>] do_sync_write+0x5a/0x90
[48693.543050]  [<ffffffff811bcb64>] vfs_write+0xb4/0x1f0
[48693.543056]  [<ffffffff811bd599>] SyS_write+0x49/0xa0
[48693.543063]  [<ffffffff8172c87f>] tracesys+0xe1/0xe6

NFS client hardware Dell T605 server, NFS server HP Proliant ML150 G2

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https://bugs.launchpad.net/bugs/585657

Title:
  Transfering large files to nfs mount causes system freeze

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