it seems that I have the same problem with my lucid machines
System: ubuntu lucid (10.04)
service NFSv4
The client hangs, the load is going very high, the machine needs a reboot

client kern.log:
Nov 26 13:32:36 frankie kernel: [46080.421384] INFO: task indicator-apple:21017 
blocked for more than 120 seconds.
Nov 26 13:32:36 frankie kernel: [46080.421393] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Nov 26 13:32:36 frankie kernel: [46080.421399] indicator-app D 0000000000000001 
    0 21017      1 0x00000008
Nov 26 13:32:36 frankie kernel: [46080.421409]  ffff88007ce858e8 
0000000000000086 0000000000015bc0 0000000000015bc0
Nov 26 13:32:36 frankie kernel: [46080.421418]  ffff88008bb21a98 
ffff88007ce85fd8 0000000000015bc0 ffff88008bb216e0
Nov 26 13:32:36 frankie kernel: [46080.421458]  0000000000015bc0 
ffff88007ce85fd8 0000000000015bc0 ffff88008bb21a98
Nov 26 13:32:36 frankie kernel: [46080.421467] Call Trace:
Nov 26 13:32:36 frankie kernel: [46080.421519]  [<ffffffffa0e804c0>] ? 
nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Nov 26 13:32:36 frankie kernel: [46080.421533]  [<ffffffff81541bc7>] 
io_schedule+0x47/0x70
Nov 26 13:32:36 frankie kernel: [46080.421557]  [<ffffffffa0e804ce>] 
nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
Nov 26 13:32:36 frankie kernel: [46080.421565]  [<ffffffff8154242f>] 
__wait_on_bit+0x5f/0x90
Nov 26 13:32:36 frankie kernel: [46080.421592]  [<ffffffffa0e804c0>] ? 
nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Nov 26 13:32:36 frankie kernel: [46080.421600]  [<ffffffff815424d8>] 
out_of_line_wait_on_bit+0x78/0x90
Nov 26 13:32:36 frankie kernel: [46080.421610]  [<ffffffff810845b0>] ? 
wake_bit_function+0x0/0x40
Nov 26 13:32:36 frankie kernel: [46080.421633]  [<ffffffffa0e804af>] 
nfs_wait_on_request+0x2f/0x40 [nfs]
Nov 26 13:32:36 frankie kernel: [46080.421657]  [<ffffffffa0e86226>] 
nfs_try_to_update_request+0xb6/0x160 [nfs]
Nov 26 13:32:36 frankie kernel: [46080.421680]  [<ffffffffa0e8630d>] 
nfs_writepage_setup+0x3d/0x1e0 [nfs]
Nov 26 13:32:36 frankie kernel: [46080.421704]  [<ffffffffa0e86544>] 
nfs_updatepage+0x94/0x1a0 [nfs]
Nov 26 13:32:36 frankie kernel: [46080.421726]  [<ffffffffa0e804f9>] ? 
nfs_release_request+0x19/0x20 [nfs]
Nov 26 13:32:36 frankie kernel: [46080.421751]  [<ffffffffa0e75eaa>] 
nfs_write_end+0x5a/0x2c0 [nfs]
Nov 26 13:32:36 frankie kernel: [46080.421760]  [<ffffffff810f3262>] ? 
iov_iter_copy_from_user_atomic+0x92/0x130
Nov 26 13:32:36 frankie kernel: [46080.421768]  [<ffffffff810f3422>] 
generic_perform_write+0x122/0x1d0
Nov 26 13:32:36 frankie kernel: [46080.421777]  [<ffffffff81061f98>] ? 
check_preempt_wakeup+0x2b8/0x3c0
Nov 26 13:32:36 frankie kernel: [46080.421786]  [<ffffffff810f4553>] 
generic_file_buffered_write+0x73/0xd0
Nov 26 13:32:36 frankie kernel: [46080.421796]  [<ffffffff810583a1>] ? 
balance_tasks+0x111/0x160
Nov 26 13:32:36 frankie kernel: [46080.421804]  [<ffffffff810f5b00>] 
__generic_file_aio_write+0x240/0x470
Nov 26 13:32:36 frankie kernel: [46080.421811]  [<ffffffff810584ed>] ? 
load_balance_fair+0xfd/0x140
Nov 26 13:32:36 frankie kernel: [46080.421819]  [<ffffffff8105fb60>] ? 
load_balance_start_fair+0x0/0x80
Nov 26 13:32:36 frankie kernel: [46080.421826]  [<ffffffff810f5d9f>] 
generic_file_aio_write+0x6f/0xe0
Nov 26 13:32:36 frankie kernel: [46080.421834]  [<ffffffff812b8906>] ? 
rb_erase+0xd6/0x160
Nov 26 13:32:36 frankie kernel: [46080.421842]  [<ffffffff81052890>] ? 
__dequeue_entity+0x30/0x50
Nov 26 13:32:36 frankie kernel: [46080.421862]  [<ffffffffa0e75a0a>] 
nfs_file_write+0xda/0x1e0 [nfs]
Nov 26 13:32:36 frankie kernel: [46080.421874]  [<ffffffff81062198>] ? 
pick_next_task_fair+0xf8/0x140
Nov 26 13:32:36 frankie kernel: [46080.421885]  [<ffffffff81142f7a>] 
do_sync_write+0xfa/0x140
Nov 26 13:32:36 frankie kernel: [46080.421892]  [<ffffffff81084570>] ? 
autoremove_wake_function+0x0/0x40
Nov 26 13:32:36 frankie kernel: [46080.421900]  [<ffffffff8154800c>] ? 
kprobe_flush_task+0xbc/0xe0
Nov 26 13:32:36 frankie kernel: [46080.421911]  [<ffffffff81252446>] ? 
security_file_permission+0x16/0x20
Nov 26 13:32:36 frankie kernel: [46080.421918]  [<ffffffff81143278>] 
vfs_write+0xb8/0x1a0
Nov 26 13:32:36 frankie kernel: [46080.421926]  [<ffffffff81143b11>] 
sys_write+0x51/0x80
Nov 26 13:32:36 frankie kernel: [46080.421936]  [<ffffffff810121b2>] 
system_call_fastpath+0x16/0x1b
Nov 26 13:34:36 frankie kernel: [46200.421362] INFO: task indicator-apple:21017 
blocked for more than 120 seconds.
Nov 26 13:34:36 frankie kernel: [46200.421371] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Nov 26 13:34:36 frankie kernel: [46200.421377] indicator-app D 0000000000000001 
    0 21017      1 0x00000008
Nov 26 13:34:36 frankie kernel: [46200.421388]  ffff88007ce858e8 
0000000000000086 0000000000015bc0 0000000000015bc0
Nov 26 13:34:36 frankie kernel: [46200.421397]  ffff88008bb21a98 
ffff88007ce85fd8 0000000000015bc0 ffff88008bb216e0
Nov 26 13:34:36 frankie kernel: [46200.421405]  0000000000015bc0 
ffff88007ce85fd8 0000000000015bc0 ffff88008bb21a98
Nov 26 13:34:36 frankie kernel: [46200.421413] Call Trace:
Nov 26 13:34:36 frankie kernel: [46200.421512]  [<ffffffffa0e804c0>] ? 
nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Nov 26 13:34:36 frankie kernel: [46200.421526]  [<ffffffff81541bc7>] 
io_schedule+0x47/0x70
Nov 26 13:34:36 frankie kernel: [46200.421550]  [<ffffffffa0e804ce>] 
nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
Nov 26 13:34:36 frankie kernel: [46200.421558]  [<ffffffff8154242f>] 
__wait_on_bit+0x5f/0x90
Nov 26 13:34:36 frankie kernel: [46200.421586]  [<ffffffffa0e804c0>] ? 
nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Nov 26 13:34:36 frankie kernel: [46200.421595]  [<ffffffff815424d8>] 
out_of_line_wait_on_bit+0x78/0x90
Nov 26 13:34:36 frankie kernel: [46200.421604]  [<ffffffff810845b0>] ? 
wake_bit_function+0x0/0x40
Nov 26 13:34:36 frankie kernel: [46200.421627]  [<ffffffffa0e804af>] 
nfs_wait_on_request+0x2f/0x40 [nfs]
Nov 26 13:34:36 frankie kernel: [46200.421651]  [<ffffffffa0e86226>] 
nfs_try_to_update_request+0xb6/0x160 [nfs]
Nov 26 13:34:36 frankie kernel: [46200.421676]  [<ffffffffa0e8630d>] 
nfs_writepage_setup+0x3d/0x1e0 [nfs]
Nov 26 13:34:36 frankie kernel: [46200.421699]  [<ffffffffa0e86544>] 
nfs_updatepage+0x94/0x1a0 [nfs]
Nov 26 13:34:36 frankie kernel: [46200.421723]  [<ffffffffa0e804f9>] ? 
nfs_release_request+0x19/0x20 [nfs]
Nov 26 13:34:36 frankie kernel: [46200.421744]  [<ffffffffa0e75eaa>] 
nfs_write_end+0x5a/0x2c0 [nfs]
Nov 26 13:34:36 frankie kernel: [46200.421754]  [<ffffffff810f3262>] ? 
iov_iter_copy_from_user_atomic+0x92/0x130
Nov 26 13:34:36 frankie kernel: [46200.421761]  [<ffffffff810f3422>] 
generic_perform_write+0x122/0x1d0
Nov 26 13:34:36 frankie kernel: [46200.421769]  [<ffffffff81061f98>] ? 
check_preempt_wakeup+0x2b8/0x3c0
Nov 26 13:34:36 frankie kernel: [46200.421779]  [<ffffffff810f4553>] 
generic_file_buffered_write+0x73/0xd0
Nov 26 13:34:36 frankie kernel: [46200.421788]  [<ffffffff810583a1>] ? 
balance_tasks+0x111/0x160
Nov 26 13:34:36 frankie kernel: [46200.421797]  [<ffffffff810f5b00>] 
__generic_file_aio_write+0x240/0x470
Nov 26 13:34:36 frankie kernel: [46200.421805]  [<ffffffff810584ed>] ? 
load_balance_fair+0xfd/0x140
Nov 26 13:34:36 frankie kernel: [46200.421812]  [<ffffffff8105fb60>] ? 
load_balance_start_fair+0x0/0x80
Nov 26 13:34:36 frankie kernel: [46200.421819]  [<ffffffff810f5d9f>] 
generic_file_aio_write+0x6f/0xe0
Nov 26 13:34:36 frankie kernel: [46200.421827]  [<ffffffff812b8906>] ? 
rb_erase+0xd6/0x160
Nov 26 13:34:36 frankie kernel: [46200.421835]  [<ffffffff81052890>] ? 
__dequeue_entity+0x30/0x50
Nov 26 13:34:36 frankie kernel: [46200.421854]  [<ffffffffa0e75a0a>] 
nfs_file_write+0xda/0x1e0 [nfs]
Nov 26 13:34:36 frankie kernel: [46200.421864]  [<ffffffff81062198>] ? 
pick_next_task_fair+0xf8/0x140
Nov 26 13:34:36 frankie kernel: [46200.421874]  [<ffffffff81142f7a>] 
do_sync_write+0xfa/0x140
Nov 26 13:34:36 frankie kernel: [46200.421881]  [<ffffffff81084570>] ? 
autoremove_wake_function+0x0/0x40
Nov 26 13:34:36 frankie kernel: [46200.421890]  [<ffffffff8154800c>] ? 
kprobe_flush_task+0xbc/0xe0
Nov 26 13:34:36 frankie kernel: [46200.421901]  [<ffffffff81252446>] ? 
security_file_permission+0x16/0x20
Nov 26 13:34:36 frankie kernel: [46200.421909]  [<ffffffff81143278>] 
vfs_write+0xb8/0x1a0
Nov 26 13:34:36 frankie kernel: [46200.421916]  [<ffffffff81143b11>] 
sys_write+0x51/0x80
Nov 26 13:34:36 frankie kernel: [46200.421926]  [<ffffffff810121b2>] 
system_call_fastpath+0x16/0x1b
...

or
Nov 25 04:05:36 nostromo kernel: [582361.882593] INFO: task firefox-bin:30446 
blocked for more than 120 seconds.
Nov 25 04:05:36 nostromo kernel: [582361.882597] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Nov 25 04:05:36 nostromo kernel: [582361.882600] firefox-bin   D 
0000000000000000     0 30446  30442 0x00000000
Nov 25 04:05:36 nostromo kernel: [582361.882606]  ffff88019ed1f8e8 
0000000000000082 0000000000015bc0 0000000000015bc0
Nov 25 04:05:36 nostromo kernel: [582361.882611]  ffff88022fd05f80 
ffff88019ed1ffd8 0000000000015bc0 ffff88022fd05bc0
Nov 25 04:05:36 nostromo kernel: [582361.882615]  0000000000015bc0 
ffff88019ed1ffd8 0000000000015bc0 ffff88022fd05f80
Nov 25 04:05:36 nostromo kernel: [582361.882619] Call Trace:
Nov 25 04:05:36 nostromo kernel: [582361.882643]  [<ffffffffa0204440>] ? 
nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Nov 25 04:05:36 nostromo kernel: [582361.882650]  [<ffffffff815415e7>] 
io_schedule+0x47/0x70
Nov 25 04:05:36 nostromo kernel: [582361.882661]  [<ffffffffa020444e>] 
nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
Nov 25 04:05:36 nostromo kernel: [582361.882665]  [<ffffffff81541e4f>] 
__wait_on_bit+0x5f/0x90
Nov 25 04:05:36 nostromo kernel: [582361.882676]  [<ffffffffa0204440>] ? 
nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Nov 25 04:05:36 nostromo kernel: [582361.882680]  [<ffffffff81541ef8>] 
out_of_line_wait_on_bit+0x78/0x90
Nov 25 04:05:36 nostromo kernel: [582361.882685]  [<ffffffff810845c0>] ? 
wake_bit_function+0x0/0x40
Nov 25 04:05:36 nostromo kernel: [582361.882690]  [<ffffffff8108893f>] ? 
hrtimer_try_to_cancel+0x3f/0xd0
Nov 25 04:05:36 nostromo kernel: [582361.882700]  [<ffffffffa020442f>] 
nfs_wait_on_request+0x2f/0x40 [nfs]
Nov 25 04:05:36 nostromo kernel: [582361.882712]  [<ffffffffa020a1a6>] 
nfs_try_to_update_request+0xb6/0x160 [nfs]
Nov 25 04:05:36 nostromo kernel: [582361.882717]  [<ffffffff8104b8d4>] ? 
scale_rt_power+0x24/0x70
Nov 25 04:05:36 nostromo kernel: [582361.882721]  [<ffffffff81051af0>] ? 
update_cpu_power+0x80/0xf0
Nov 25 04:05:36 nostromo kernel: [582361.882733]  [<ffffffffa020a28d>] 
nfs_writepage_setup+0x3d/0x1e0 [nfs]
Nov 25 04:05:36 nostromo kernel: [582361.882744]  [<ffffffffa020a4c4>] 
nfs_updatepage+0x94/0x1a0 [nfs]
Nov 25 04:05:36 nostromo kernel: [582361.882754]  [<ffffffffa0204479>] ? 
nfs_release_request+0x19/0x20 [nfs]
Nov 25 04:05:36 nostromo kernel: [582361.882764]  [<ffffffffa01f9e2a>] 
nfs_write_end+0x5a/0x2c0 [nfs]
Nov 25 04:05:36 nostromo kernel: [582361.882768]  [<ffffffff810f3242>] ? 
iov_iter_copy_from_user_atomic+0x92/0x130
Nov 25 04:05:36 nostromo kernel: [582361.882772]  [<ffffffff810f3402>] 
generic_perform_write+0x122/0x1d0
Nov 25 04:05:36 nostromo kernel: [582361.882776]  [<ffffffff810f4533>] 
generic_file_buffered_write+0x73/0xd0
Nov 25 04:05:36 nostromo kernel: [582361.882780]  [<ffffffff810f5ae0>] 
__generic_file_aio_write+0x240/0x470
Nov 25 04:05:36 nostromo kernel: [582361.882784]  [<ffffffff81052ce8>] ? 
enqueue_sleeper+0x158/0x220
Nov 25 04:05:36 nostromo kernel: [582361.882787]  [<ffffffff8105da22>] ? 
enqueue_entity+0x122/0x1a0
Nov 25 04:05:36 nostromo kernel: [582361.882791]  [<ffffffff810f5d7f>] 
generic_file_aio_write+0x6f/0xe0
Nov 25 04:05:36 nostromo kernel: [582361.882800]  [<ffffffffa01f998a>] 
nfs_file_write+0xda/0x1e0 [nfs]
Nov 25 04:05:36 nostromo kernel: [582361.882805]  [<ffffffff81142daa>] 
do_sync_write+0xfa/0x140
Nov 25 04:05:36 nostromo kernel: [582361.882809]  [<ffffffff81084580>] ? 
autoremove_wake_function+0x0/0x40
Nov 25 04:05:36 nostromo kernel: [582361.882814]  [<ffffffff81252256>] ? 
security_file_permission+0x16/0x20
Nov 25 04:05:36 nostromo kernel: [582361.882818]  [<ffffffff811430a8>] 
vfs_write+0xb8/0x1a0
Nov 25 04:05:36 nostromo kernel: [582361.882821]  [<ffffffff81143941>] 
sys_write+0x51/0x80
Nov 25 04:05:36 nostromo kernel: [582361.882826]  [<ffffffff810121b2>] 
system_call_fastpath+0x16/0x1b
Nov 25 04:07:36 nostromo kernel: [582481.882591] INFO: task firefox-bin:30446 
blocked for more than 120 seconds.
Nov 25 04:07:36 nostromo kernel: [582481.882595] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Nov 25 04:07:36 nostromo kernel: [582481.882598] firefox-bin   D 
0000000000000000     0 30446  30442 0x00000000
Nov 25 04:07:36 nostromo kernel: [582481.882603]  ffff88019ed1f8e8 
0000000000000082 0000000000015bc0 0000000000015bc0
Nov 25 04:07:36 nostromo kernel: [582481.882608]  ffff88022fd05f80 
ffff88019ed1ffd8 0000000000015bc0 ffff88022fd05bc0
Nov 25 04:07:36 nostromo kernel: [582481.882612]  0000000000015bc0 
ffff88019ed1ffd8 0000000000015bc0 ffff88022fd05f80
Nov 25 04:07:36 nostromo kernel: [582481.882617] Call Trace:
Nov 25 04:07:36 nostromo kernel: [582481.882642]  [<ffffffffa0204440>] ? 
nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Nov 25 04:07:36 nostromo kernel: [582481.882649]  [<ffffffff815415e7>] 
io_schedule+0x47/0x70
Nov 25 04:07:36 nostromo kernel: [582481.882659]  [<ffffffffa020444e>] 
nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
Nov 25 04:07:36 nostromo kernel: [582481.882664]  [<ffffffff81541e4f>] 
__wait_on_bit+0x5f/0x90
Nov 25 04:07:36 nostromo kernel: [582481.882674]  [<ffffffffa0204440>] ? 
nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Nov 25 04:07:36 nostromo kernel: [582481.882678]  [<ffffffff81541ef8>] 
out_of_line_wait_on_bit+0x78/0x90
Nov 25 04:07:36 nostromo kernel: [582481.882684]  [<ffffffff810845c0>] ? 
wake_bit_function+0x0/0x40
Nov 25 04:07:36 nostromo kernel: [582481.882688]  [<ffffffff8108893f>] ? 
hrtimer_try_to_cancel+0x3f/0xd0
Nov 25 04:07:36 nostromo kernel: [582481.882699]  [<ffffffffa020442f>] 
nfs_wait_on_request+0x2f/0x40 [nfs]
Nov 25 04:07:36 nostromo kernel: [582481.882711]  [<ffffffffa020a1a6>] 
nfs_try_to_update_request+0xb6/0x160 [nfs]
Nov 25 04:07:36 nostromo kernel: [582481.882716]  [<ffffffff8104b8d4>] ? 
scale_rt_power+0x24/0x70
Nov 25 04:07:36 nostromo kernel: [582481.882720]  [<ffffffff81051af0>] ? 
update_cpu_power+0x80/0xf0
Nov 25 04:07:36 nostromo kernel: [582481.882731]  [<ffffffffa020a28d>] 
nfs_writepage_setup+0x3d/0x1e0 [nfs]
Nov 25 04:07:36 nostromo kernel: [582481.882743]  [<ffffffffa020a4c4>] 
nfs_updatepage+0x94/0x1a0 [nfs]
Nov 25 04:07:36 nostromo kernel: [582481.882753]  [<ffffffffa0204479>] ? 
nfs_release_request+0x19/0x20 [nfs]
Nov 25 04:07:36 nostromo kernel: [582481.882762]  [<ffffffffa01f9e2a>] 
nfs_write_end+0x5a/0x2c0 [nfs]
Nov 25 04:07:36 nostromo kernel: [582481.882767]  [<ffffffff810f3242>] ? 
iov_iter_copy_from_user_atomic+0x92/0x130
Nov 25 04:07:36 nostromo kernel: [582481.882771]  [<ffffffff810f3402>] 
generic_perform_write+0x122/0x1d0
Nov 25 04:07:36 nostromo kernel: [582481.882775]  [<ffffffff810f4533>] 
generic_file_buffered_write+0x73/0xd0
Nov 25 04:07:36 nostromo kernel: [582481.882779]  [<ffffffff810f5ae0>] 
__generic_file_aio_write+0x240/0x470
Nov 25 04:07:36 nostromo kernel: [582481.882782]  [<ffffffff81052ce8>] ? 
enqueue_sleeper+0x158/0x220
Nov 25 04:07:36 nostromo kernel: [582481.882786]  [<ffffffff8105da22>] ? 
enqueue_entity+0x122/0x1a0
Nov 25 04:07:36 nostromo kernel: [582481.882789]  [<ffffffff810f5d7f>] 
generic_file_aio_write+0x6f/0xe0
Nov 25 04:07:36 nostromo kernel: [582481.882799]  [<ffffffffa01f998a>] 
nfs_file_write+0xda/0x1e0 [nfs]
Nov 25 04:07:36 nostromo kernel: [582481.882803]  [<ffffffff81142daa>] 
do_sync_write+0xfa/0x140
Nov 25 04:07:36 nostromo kernel: [582481.882807]  [<ffffffff81084580>] ? 
autoremove_wake_function+0x0/0x40
Nov 25 04:07:36 nostromo kernel: [582481.882813]  [<ffffffff81252256>] ? 
security_file_permission+0x16/0x20
Nov 25 04:07:36 nostromo kernel: [582481.882816]  [<ffffffff811430a8>] 
vfs_write+0xb8/0x1a0
Nov 25 04:07:36 nostromo kernel: [582481.882820]  [<ffffffff81143941>] 
sys_write+0x51/0x80
Nov 25 04:07:36 nostromo kernel: [582481.882825]  [<ffffffff810121b2>] 
system_call_fastpath+0x16/0x1b

-- 
Overload the server ... __mutex_lock_slowpath
https://bugs.launchpad.net/bugs/658131
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