No love, 
Linux tonic 2.6.35-9-server #14~lucid1-Ubuntu SMP Sun Jul 18 22:44:45 UTC 2010 
x86_64 GNU/Linux
has the same problem:

Jul 22 08:43:10 tonic kernel: [55920.730905] nfsd          D 00000001005482f1   
  0  4452      2 0x00000000
Jul 22 08:43:10 tonic kernel: [55920.730909]  ffff8801ef767950 0000000000000046 
ffff880100000000 0000000000015900
Jul 22 08:43:10 tonic kernel: [55920.730913]  ffff8801ef767fd8 0000000000015900 
ffff8801ef767fd8 ffff8801ef780000
Jul 22 08:43:10 tonic kernel: [55920.730917]  0000000000015900 0000000000015900 
ffff8801ef767fd8 0000000000015900
Jul 22 08:43:10 tonic kernel: [55920.730921] Call Trace:
Jul 22 08:43:10 tonic kernel: [55920.730925]  [<ffffffff8159d32f>] 
__mutex_lock_slowpath+0xff/0x190
Jul 22 08:43:10 tonic kernel: [55920.730929]  [<ffffffff8159cd23>] 
mutex_lock+0x23/0x50
Jul 22 08:43:10 tonic kernel: [55920.730933]  [<ffffffff811019a2>] 
generic_file_aio_write+0x52/0xd0
Jul 22 08:43:10 tonic kernel: [55920.730936]  [<ffffffff81101950>] ? 
generic_file_aio_write+0x0/0xd0
Jul 22 08:43:10 tonic kernel: [55920.730940]  [<ffffffff81151713>] 
do_sync_readv_writev+0xd3/0x110
Jul 22 08:43:10 tonic kernel: [55920.730944]  [<ffffffff8159e49e>] ? 
_raw_spin_lock+0xe/0x20
Jul 22 08:43:10 tonic kernel: [55920.730948]  [<ffffffff8128e749>] ? 
apparmor_file_permission+0x19/0x20
Jul 22 08:43:10 tonic kernel: [55920.730952]  [<ffffffff8125d3b6>] ? 
security_file_permission+0x16/0x20
Jul 22 08:43:10 tonic kernel: [55920.730956]  [<ffffffff8115274f>] 
do_readv_writev+0xcf/0x1f0
Jul 22 08:43:10 tonic kernel: [55920.730959]  [<ffffffff8108607b>] ? 
set_groups+0x3b/0x60
Jul 22 08:43:10 tonic kernel: [55920.730969]  [<ffffffffa026b9d6>] ? 
nfsd_setuser+0x126/0x2c0 [nfsd]
Jul 22 08:43:10 tonic kernel: [55920.730973]  [<ffffffff811a54e0>] ? 
dquot_file_open+0x0/0x50
Jul 22 08:43:10 tonic kernel: [55920.730976]  [<ffffffff811528b8>] 
vfs_writev+0x48/0x60
Jul 22 08:43:10 tonic kernel: [55920.730985]  [<ffffffffa026517d>] 
nfsd_vfs_write+0x10d/0x420 [nfsd]
Jul 22 08:43:10 tonic kernel: [55920.730989]  [<ffffffff81150142>] ? 
dentry_open+0x52/0xc0
Jul 22 08:43:10 tonic kernel: [55920.730998]  [<ffffffffa02656e1>] ? 
nfsd_open+0x101/0x1a0 [nfsd]
Jul 22 08:43:10 tonic kernel: [55920.731007]  [<ffffffffa02659f7>] 
nfsd_write+0xe7/0x100 [nfsd]
Jul 22 08:43:10 tonic kernel: [55920.731017]  [<ffffffffa026f37f>] 
nfsd3_proc_write+0xaf/0x140 [nfsd]
Jul 22 08:43:10 tonic kernel: [55920.731025]  [<ffffffffa026043e>] 
nfsd_dispatch+0xfe/0x250 [nfsd]
Jul 22 08:43:10 tonic kernel: [55920.731039]  [<ffffffffa01b8774>] 
svc_process_common+0x344/0x610 [sunrpc]
Jul 22 08:43:10 tonic kernel: [55920.731043]  [<ffffffff81055b70>] ? 
default_wake_function+0x0/0x20
Jul 22 08:43:10 tonic kernel: [55920.731056]  [<ffffffffa01b8b50>] 
svc_process+0x110/0x150 [sunrpc]
Jul 22 08:43:10 tonic kernel: [55920.731064]  [<ffffffffa0260ae5>] 
nfsd+0xc5/0x170 [nfsd]
Jul 22 08:43:10 tonic kernel: [55920.731072]  [<ffffffffa0260a20>] ? 
nfsd+0x0/0x170 [nfsd]
Jul 22 08:43:10 tonic kernel: [55920.731076]  [<ffffffff8107d9c6>] 
kthread+0x96/0xa0
Jul 22 08:43:10 tonic kernel: [55920.731080]  [<ffffffff8100aee4>] 
kernel_thread_helper+0x4/0x10
Jul 22 08:43:10 tonic kernel: [55920.731083]  [<ffffffff8107d930>] ? 
kthread+0x0/0xa0
Jul 22 08:43:10 tonic kernel: [55920.731086]  [<ffffffff8100aee0>] ? 
kernel_thread_helper+0x0/0x10

-- 
INFO: task nfsd:5047 blocked for more than 120 seconds.
https://bugs.launchpad.net/bugs/606523
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