[Bug 561210] Re: Writing big files to NFS target causes system lock up

Thag bruce.edge at gmail.com
Wed Sep 29 23:44:26 UTC 2010 

0 %> uname -a

Linux topaz 2.6.32-24-server #43-Ubuntu SMP Thu Sep 16 16:05:42 UTC 2010
x86_64 GNU/Linux


New hardware, new Ubuntu = can't use NFS:

Sep 28 10:12:50 topaz kernel: [604724.768485] SGI XFS with ACLs, security attributes, realtime, large block/inode numbers, no debug enabled
Sep 28 10:12:50 topaz kernel: [604724.770961] SGI XFS Quota Management subsystem
Sep 28 10:12:50 topaz kernel: [604724.801090] JFS: nTxBlock = 8192, nTxLock = 65536
Sep 28 10:12:50 topaz kernel: [604724.853982] NTFS driver 2.1.29 [Flags: R/O MODULE].
Sep 28 10:12:50 topaz kernel: [604724.901501] QNX4 filesystem 0.2.3 registered.
Sep 28 10:12:50 topaz kernel: [604724.993765] Btrfs loaded
Sep 29 15:14:06 topaz kernel: [709201.511036] INFO: task tar:2926 blocked for more than 120 seconds.
Sep 29 15:14:06 topaz kernel: [709201.526445] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 29 15:14:06 topaz kernel: [709201.542739] tar           D 0000000000000002     0  2926  16813 0x00000004
Sep 29 15:14:06 topaz kernel: [709201.542751]  ffff880211945c48 0000000000000082 0000000000015bc0 0000000000015bc0
Sep 29 15:14:06 topaz kernel: [709201.542761]  ffff88015fa931a0 ffff880211945fd8 0000000000015bc0 ffff88015fa92de0
Sep 29 15:14:06 topaz kernel: [709201.542770]  0000000000015bc0 ffff880211945fd8 0000000000015bc0 ffff88015fa931a0
Sep 29 15:14:06 topaz kernel: [709201.542778] Call Trace:
Sep 29 15:14:06 topaz kernel: [709201.542814]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:14:06 topaz kernel: [709201.542831]  [<ffffffff81558b97>] io_schedule+0x47/0x70
Sep 29 15:14:06 topaz kernel: [709201.542856]  [<ffffffffa01e438e>] nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
Sep 29 15:14:06 topaz kernel: [709201.542866]  [<ffffffff815591bf>] __wait_on_bit+0x5f/0x90
Sep 29 15:14:06 topaz kernel: [709201.542885]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:14:06 topaz kernel: [709201.542893]  [<ffffffff81559268>] out_of_line_wait_on_bit+0x78/0x90
Sep 29 15:14:06 topaz kernel: [709201.542907]  [<ffffffff810850f0>] ? wake_bit_function+0x0/0x40
Sep 29 15:14:06 topaz kernel: [709201.542925]  [<ffffffffa01e436f>] nfs_wait_on_request+0x2f/0x40 [nfs]
Sep 29 15:14:06 topaz kernel: [709201.542945]  [<ffffffffa01e879f>] nfs_wait_on_requests_locked+0x7f/0xd0 [nfs]
Sep 29 15:14:06 topaz kernel: [709201.542966]  [<ffffffffa01e9bde>] nfs_sync_mapping_wait+0x9e/0x1a0 [nfs]
Sep 29 15:14:06 topaz kernel: [709201.542988]  [<ffffffffa01e9fc9>] nfs_write_mapping+0x79/0xb0 [nfs]
Sep 29 15:14:06 topaz kernel: [709201.543010]  [<ffffffffa01ea037>] nfs_wb_all+0x17/0x20 [nfs]
Sep 29 15:14:06 topaz kernel: [709201.543031]  [<ffffffffa01d8f7a>] nfs_do_fsync+0x2a/0x60 [nfs]
Sep 29 15:14:06 topaz kernel: [709201.543047]  [<ffffffffa01d91c5>] nfs_file_flush+0x75/0xa0 [nfs]
Sep 29 15:14:06 topaz kernel: [709201.543057]  [<ffffffff8114225c>] filp_close+0x3c/0x90
Sep 29 15:14:06 topaz kernel: [709201.543064]  [<ffffffff81142367>] sys_close+0xb7/0x120
Sep 29 15:14:06 topaz kernel: [709201.543073]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b
Sep 29 15:16:06 topaz kernel: [709321.540858] INFO: task tar:2926 blocked for more than 120 seconds.
Sep 29 15:16:06 topaz kernel: [709321.549024] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 29 15:16:06 topaz kernel: [709321.565670] tar           D 0000000000000002     0  2926  16813 0x00000004
Sep 29 15:16:06 topaz kernel: [709321.565678]  ffff880211945c48 0000000000000082 0000000000015bc0 0000000000015bc0
Sep 29 15:16:06 topaz kernel: [709321.565685]  ffff88015fa931a0 ffff880211945fd8 0000000000015bc0 ffff88015fa92de0
Sep 29 15:16:06 topaz kernel: [709321.565690]  0000000000015bc0 ffff880211945fd8 0000000000015bc0 ffff88015fa931a0
Sep 29 15:16:06 topaz kernel: [709321.565696] Call Trace:
Sep 29 15:16:06 topaz kernel: [709321.565724]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:16:06 topaz kernel: [709321.565734]  [<ffffffff81558b97>] io_schedule+0x47/0x70
Sep 29 15:16:06 topaz kernel: [709321.565746]  [<ffffffffa01e438e>] nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
Sep 29 15:16:06 topaz kernel: [709321.565752]  [<ffffffff815591bf>] __wait_on_bit+0x5f/0x90
Sep 29 15:16:06 topaz kernel: [709321.565764]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:16:06 topaz kernel: [709321.565769]  [<ffffffff81559268>] out_of_line_wait_on_bit+0x78/0x90
Sep 29 15:16:06 topaz kernel: [709321.565776]  [<ffffffff810850f0>] ? wake_bit_function+0x0/0x40
Sep 29 15:16:06 topaz kernel: [709321.565788]  [<ffffffffa01e436f>] nfs_wait_on_request+0x2f/0x40 [nfs]
Sep 29 15:16:06 topaz kernel: [709321.565801]  [<ffffffffa01e879f>] nfs_wait_on_requests_locked+0x7f/0xd0 [nfs]
Sep 29 15:16:06 topaz kernel: [709321.565815]  [<ffffffffa01e9bde>] nfs_sync_mapping_wait+0x9e/0x1a0 [nfs]
Sep 29 15:16:06 topaz kernel: [709321.565829]  [<ffffffffa01e9fc9>] nfs_write_mapping+0x79/0xb0 [nfs]
Sep 29 15:16:06 topaz kernel: [709321.565842]  [<ffffffffa01ea037>] nfs_wb_all+0x17/0x20 [nfs]
Sep 29 15:16:06 topaz kernel: [709321.565852]  [<ffffffffa01d8f7a>] nfs_do_fsync+0x2a/0x60 [nfs]
Sep 29 15:16:06 topaz kernel: [709321.565861]  [<ffffffffa01d91c5>] nfs_file_flush+0x75/0xa0 [nfs]
Sep 29 15:16:06 topaz kernel: [709321.565868]  [<ffffffff8114225c>] filp_close+0x3c/0x90
Sep 29 15:16:06 topaz kernel: [709321.565872]  [<ffffffff81142367>] sys_close+0xb7/0x120
Sep 29 15:16:06 topaz kernel: [709321.565879]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b
Sep 29 15:18:06 topaz kernel: [709441.560271] INFO: task tar:2926 blocked for more than 120 seconds.
Sep 29 15:18:06 topaz kernel: [709441.568959] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 29 15:18:06 topaz kernel: [709441.586769] tar           D 0000000000000002     0  2926  16813 0x00000004
Sep 29 15:18:06 topaz kernel: [709441.586781]  ffff880211945c48 0000000000000082 0000000000015bc0 0000000000015bc0
Sep 29 15:18:06 topaz kernel: [709441.586788]  ffff88015fa931a0 ffff880211945fd8 0000000000015bc0 ffff88015fa92de0
Sep 29 15:18:06 topaz kernel: [709441.586793]  0000000000015bc0 ffff880211945fd8 0000000000015bc0 ffff88015fa931a0
Sep 29 15:18:06 topaz kernel: [709441.586799] Call Trace:
Sep 29 15:18:06 topaz kernel: [709441.586827]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:18:06 topaz kernel: [709441.586838]  [<ffffffff81558b97>] io_schedule+0x47/0x70
Sep 29 15:18:06 topaz kernel: [709441.586850]  [<ffffffffa01e438e>] nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
Sep 29 15:18:06 topaz kernel: [709441.586855]  [<ffffffff815591bf>] __wait_on_bit+0x5f/0x90
Sep 29 15:18:06 topaz kernel: [709441.586867]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:18:06 topaz kernel: [709441.586872]  [<ffffffff81559268>] out_of_line_wait_on_bit+0x78/0x90
Sep 29 15:18:06 topaz kernel: [709441.586878]  [<ffffffff810850f0>] ? wake_bit_function+0x0/0x40
Sep 29 15:18:06 topaz kernel: [709441.586890]  [<ffffffffa01e436f>] nfs_wait_on_request+0x2f/0x40 [nfs]
Sep 29 15:18:06 topaz kernel: [709441.586904]  [<ffffffffa01e879f>] nfs_wait_on_requests_locked+0x7f/0xd0 [nfs]
Sep 29 15:18:06 topaz kernel: [709441.586917]  [<ffffffffa01e9bde>] nfs_sync_mapping_wait+0x9e/0x1a0 [nfs]
Sep 29 15:18:06 topaz kernel: [709441.586931]  [<ffffffffa01e9fc9>] nfs_write_mapping+0x79/0xb0 [nfs]
Sep 29 15:18:06 topaz kernel: [709441.586944]  [<ffffffffa01ea037>] nfs_wb_all+0x17/0x20 [nfs]
Sep 29 15:18:06 topaz kernel: [709441.586953]  [<ffffffffa01d8f7a>] nfs_do_fsync+0x2a/0x60 [nfs]
Sep 29 15:18:06 topaz kernel: [709441.586963]  [<ffffffffa01d91c5>] nfs_file_flush+0x75/0xa0 [nfs]
Sep 29 15:18:06 topaz kernel: [709441.586970]  [<ffffffff8114225c>] filp_close+0x3c/0x90
Sep 29 15:18:06 topaz kernel: [709441.586974]  [<ffffffff81142367>] sys_close+0xb7/0x120
Sep 29 15:18:06 topaz kernel: [709441.586980]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b
Sep 29 15:20:06 topaz kernel: [709561.580222] INFO: task tar:2926 blocked for more than 120 seconds.
Sep 29 15:20:06 topaz kernel: [709561.589474] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 29 15:20:06 topaz kernel: [709561.608381] tar           D 0000000000000002     0  2926  16813 0x00000004
Sep 29 15:20:06 topaz kernel: [709561.608392]  ffff880211945c48 0000000000000082 0000000000015bc0 0000000000015bc0
Sep 29 15:20:06 topaz kernel: [709561.608399]  ffff88015fa931a0 ffff880211945fd8 0000000000015bc0 ffff88015fa92de0
Sep 29 15:20:06 topaz kernel: [709561.608404]  0000000000015bc0 ffff880211945fd8 0000000000015bc0 ffff88015fa931a0
Sep 29 15:20:06 topaz kernel: [709561.608410] Call Trace:
Sep 29 15:20:06 topaz kernel: [709561.608437]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:20:06 topaz kernel: [709561.608448]  [<ffffffff81558b97>] io_schedule+0x47/0x70
Sep 29 15:20:06 topaz kernel: [709561.608460]  [<ffffffffa01e438e>] nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
Sep 29 15:20:06 topaz kernel: [709561.608466]  [<ffffffff815591bf>] __wait_on_bit+0x5f/0x90
Sep 29 15:20:06 topaz kernel: [709561.608477]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:20:06 topaz kernel: [709561.608483]  [<ffffffff81559268>] out_of_line_wait_on_bit+0x78/0x90
Sep 29 15:20:06 topaz kernel: [709561.608490]  [<ffffffff810850f0>] ? wake_bit_function+0x0/0x40
Sep 29 15:20:06 topaz kernel: [709561.608502]  [<ffffffffa01e436f>] nfs_wait_on_request+0x2f/0x40 [nfs]
Sep 29 15:20:06 topaz kernel: [709561.608515]  [<ffffffffa01e879f>] nfs_wait_on_requests_locked+0x7f/0xd0 [nfs]
Sep 29 15:20:06 topaz kernel: [709561.608529]  [<ffffffffa01e9bde>] nfs_sync_mapping_wait+0x9e/0x1a0 [nfs]
Sep 29 15:20:06 topaz kernel: [709561.608542]  [<ffffffffa01e9fc9>] nfs_write_mapping+0x79/0xb0 [nfs]
Sep 29 15:20:06 topaz kernel: [709561.608555]  [<ffffffffa01ea037>] nfs_wb_all+0x17/0x20 [nfs]
Sep 29 15:20:06 topaz kernel: [709561.608565]  [<ffffffffa01d8f7a>] nfs_do_fsync+0x2a/0x60 [nfs]
Sep 29 15:20:06 topaz kernel: [709561.608575]  [<ffffffffa01d91c5>] nfs_file_flush+0x75/0xa0 [nfs]
Sep 29 15:20:06 topaz kernel: [709561.608582]  [<ffffffff8114225c>] filp_close+0x3c/0x90
Sep 29 15:20:06 topaz kernel: [709561.608586]  [<ffffffff81142367>] sys_close+0xb7/0x120
Sep 29 15:20:06 topaz kernel: [709561.608592]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b
Sep 29 15:22:06 topaz kernel: [709681.600233] INFO: task tar:2926 blocked for more than 120 seconds.
Sep 29 15:22:06 topaz kernel: [709681.610102] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 29 15:22:07 topaz kernel: [709681.630104] tar           D 0000000000000002     0  2926  16813 0x00000004
Sep 29 15:22:07 topaz kernel: [709681.630115]  ffff880211945c48 0000000000000082 0000000000015bc0 0000000000015bc0
Sep 29 15:22:07 topaz kernel: [709681.630122]  ffff88015fa931a0 ffff880211945fd8 0000000000015bc0 ffff88015fa92de0
Sep 29 15:22:07 topaz kernel: [709681.630127]  0000000000015bc0 ffff880211945fd8 0000000000015bc0 ffff88015fa931a0
Sep 29 15:22:07 topaz kernel: [709681.630133] Call Trace:
Sep 29 15:22:07 topaz kernel: [709681.630171]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:22:07 topaz kernel: [709681.630183]  [<ffffffff81558b97>] io_schedule+0x47/0x70
Sep 29 15:22:07 topaz kernel: [709681.630195]  [<ffffffffa01e438e>] nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
Sep 29 15:22:07 topaz kernel: [709681.630201]  [<ffffffff815591bf>] __wait_on_bit+0x5f/0x90
Sep 29 15:22:07 topaz kernel: [709681.630213]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:22:07 topaz kernel: [709681.630218]  [<ffffffff81559268>] out_of_line_wait_on_bit+0x78/0x90
Sep 29 15:22:07 topaz kernel: [709681.630225]  [<ffffffff810850f0>] ? wake_bit_function+0x0/0x40
Sep 29 15:22:07 topaz kernel: [709681.630237]  [<ffffffffa01e436f>] nfs_wait_on_request+0x2f/0x40 [nfs]
Sep 29 15:22:07 topaz kernel: [709681.630250]  [<ffffffffa01e879f>] nfs_wait_on_requests_locked+0x7f/0xd0 [nfs]
Sep 29 15:22:07 topaz kernel: [709681.630263]  [<ffffffffa01e9bde>] nfs_sync_mapping_wait+0x9e/0x1a0 [nfs]
Sep 29 15:22:07 topaz kernel: [709681.630277]  [<ffffffffa01e9fc9>] nfs_write_mapping+0x79/0xb0 [nfs]
Sep 29 15:22:07 topaz kernel: [709681.630290]  [<ffffffffa01ea037>] nfs_wb_all+0x17/0x20 [nfs]
Sep 29 15:22:07 topaz kernel: [709681.630300]  [<ffffffffa01d8f7a>] nfs_do_fsync+0x2a/0x60 [nfs]
Sep 29 15:22:07 topaz kernel: [709681.630309]  [<ffffffffa01d91c5>] nfs_file_flush+0x75/0xa0 [nfs]
Sep 29 15:22:07 topaz kernel: [709681.630316]  [<ffffffff8114225c>] filp_close+0x3c/0x90
Sep 29 15:22:07 topaz kernel: [709681.630320]  [<ffffffff81142367>] sys_close+0xb7/0x120
Sep 29 15:22:07 topaz kernel: [709681.630327]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b
Sep 29 15:24:07 topaz kernel: [709801.630845] INFO: task vi:1505 blocked for more than 120 seconds.
Sep 29 15:24:07 topaz kernel: [709801.641083] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 29 15:24:07 topaz kernel: [709801.662246] vi            D 00000000ffffffff     0  1505   1693 0x00000000
Sep 29 15:24:07 topaz kernel: [709801.662258]  ffff880062adbcc8 0000000000000082 0000000000015bc0 0000000000015bc0
Sep 29 15:24:07 topaz kernel: [709801.662265]  ffff880067c85f80 ffff880062adbfd8 0000000000015bc0 ffff880067c85bc0
Sep 29 15:24:07 topaz kernel: [709801.662271]  0000000000015bc0 ffff880062adbfd8 0000000000015bc0 ffff880067c85f80
Sep 29 15:24:07 topaz kernel: [709801.662277] Call Trace:
Sep 29 15:24:07 topaz kernel: [709801.662290]  [<ffffffff810f43f0>] ? sync_page+0x0/0x50
Sep 29 15:24:07 topaz kernel: [709801.662297]  [<ffffffff81558b97>] io_schedule+0x47/0x70
Sep 29 15:24:07 topaz kernel: [709801.662301]  [<ffffffff810f442d>] sync_page+0x3d/0x50
Sep 29 15:24:07 topaz kernel: [709801.662306]  [<ffffffff815591bf>] __wait_on_bit+0x5f/0x90
Sep 29 15:24:07 topaz kernel: [709801.662310]  [<ffffffff810f45e3>] wait_on_page_bit+0x73/0x80
Sep 29 15:24:07 topaz kernel: [709801.662316]  [<ffffffff810850f0>] ? wake_bit_function+0x0/0x40
Sep 29 15:24:07 topaz kernel: [709801.662321]  [<ffffffff810fea15>] ? pagevec_lookup_tag+0x25/0x40
Sep 29 15:24:07 topaz kernel: [709801.662325]  [<ffffffff810f4a75>] wait_on_page_writeback_range+0xf5/0x190
Sep 29 15:24:07 topaz kernel: [709801.662331]  [<ffffffff810fdbc1>] ? do_writepages+0x21/0x40
Sep 29 15:24:07 topaz kernel: [709801.662335]  [<ffffffff810f4bcb>] ? __filemap_fdatawrite_range+0x5b/0x60
Sep 29 15:24:07 topaz kernel: [709801.662339]  [<ffffffff810f4c48>] filemap_write_and_wait_range+0x78/0x90
Sep 29 15:24:07 topaz kernel: [709801.662351]  [<ffffffff8116ba8e>] vfs_fsync_range+0x7e/0xe0
Sep 29 15:24:07 topaz kernel: [709801.662355]  [<ffffffff8116bb5d>] vfs_fsync+0x1d/0x20
Sep 29 15:24:07 topaz kernel: [709801.662359]  [<ffffffff8116bb9e>] do_fsync+0x3e/0x60
Sep 29 15:24:07 topaz kernel: [709801.662363]  [<ffffffff8116bbf0>] sys_fsync+0x10/0x20
Sep 29 15:24:07 topaz kernel: [709801.662369]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b
Sep 29 15:24:07 topaz kernel: [709801.662374] INFO: task tar:2926 blocked for more than 120 seconds.
Sep 29 15:24:07 topaz kernel: [709801.673182] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 29 15:24:07 topaz kernel: [709801.696008] tar           D 0000000000000002     0  2926  16813 0x00000004
Sep 29 15:24:07 topaz kernel: [709801.696019]  ffff880211945c48 0000000000000082 0000000000015bc0 0000000000015bc0
Sep 29 15:24:07 topaz kernel: [709801.696025]  ffff88015fa931a0 ffff880211945fd8 0000000000015bc0 ffff88015fa92de0
Sep 29 15:24:07 topaz kernel: [709801.696031]  0000000000015bc0 ffff880211945fd8 0000000000015bc0 ffff88015fa931a0
Sep 29 15:24:07 topaz kernel: [709801.696037] Call Trace:
Sep 29 15:24:07 topaz kernel: [709801.696068]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:24:07 topaz kernel: [709801.696079]  [<ffffffff81558b97>] io_schedule+0x47/0x70
Sep 29 15:24:07 topaz kernel: [709801.696091]  [<ffffffffa01e438e>] nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
Sep 29 15:24:07 topaz kernel: [709801.696096]  [<ffffffff815591bf>] __wait_on_bit+0x5f/0x90
Sep 29 15:24:07 topaz kernel: [709801.696108]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:24:07 topaz kernel: [709801.696113]  [<ffffffff81559268>] out_of_line_wait_on_bit+0x78/0x90
Sep 29 15:24:07 topaz kernel: [709801.696120]  [<ffffffff810850f0>] ? wake_bit_function+0x0/0x40
Sep 29 15:24:07 topaz kernel: [709801.696133]  [<ffffffffa01e436f>] nfs_wait_on_request+0x2f/0x40 [nfs]
Sep 29 15:24:07 topaz kernel: [709801.696146]  [<ffffffffa01e879f>] nfs_wait_on_requests_locked+0x7f/0xd0 [nfs]
Sep 29 15:24:07 topaz kernel: [709801.696160]  [<ffffffffa01e9bde>] nfs_sync_mapping_wait+0x9e/0x1a0 [nfs]
Sep 29 15:24:07 topaz kernel: [709801.696174]  [<ffffffffa01e9fc9>] nfs_write_mapping+0x79/0xb0 [nfs]
Sep 29 15:24:07 topaz kernel: [709801.696187]  [<ffffffffa01ea037>] nfs_wb_all+0x17/0x20 [nfs]
Sep 29 15:24:07 topaz kernel: [709801.696197]  [<ffffffffa01d8f7a>] nfs_do_fsync+0x2a/0x60 [nfs]
Sep 29 15:24:07 topaz kernel: [709801.696207]  [<ffffffffa01d91c5>] nfs_file_flush+0x75/0xa0 [nfs]
Sep 29 15:24:07 topaz kernel: [709801.696214]  [<ffffffff8114225c>] filp_close+0x3c/0x90
Sep 29 15:24:07 topaz kernel: [709801.696218]  [<ffffffff81142367>] sys_close+0xb7/0x120
Sep 29 15:24:07 topaz kernel: [709801.696224]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b
Sep 29 15:26:07 topaz kernel: [709921.692534] INFO: task vi:1505 blocked for more than 120 seconds.
Sep 29 15:26:07 topaz kernel: [709921.704107] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 29 15:26:07 topaz kernel: [709921.727467] vi            D 00000000ffffffff     0  1505   1693 0x00000000
Sep 29 15:26:07 topaz kernel: [709921.727485]  ffff880062adbcc8 0000000000000082 0000000000015bc0 0000000000015bc0
Sep 29 15:26:07 topaz kernel: [709921.727504]  ffff880067c85f80 ffff880062adbfd8 0000000000015bc0 ffff880067c85bc0
Sep 29 15:26:07 topaz kernel: [709921.727521]  0000000000015bc0 ffff880062adbfd8 0000000000015bc0 ffff880067c85f80
Sep 29 15:26:07 topaz kernel: [709921.727538] Call Trace:
Sep 29 15:26:07 topaz kernel: [709921.727555]  [<ffffffff810f43f0>] ? sync_page+0x0/0x50
Sep 29 15:26:07 topaz kernel: [709921.727566]  [<ffffffff81558b97>] io_schedule+0x47/0x70
Sep 29 15:26:07 topaz kernel: [709921.727575]  [<ffffffff810f442d>] sync_page+0x3d/0x50
Sep 29 15:26:07 topaz kernel: [709921.727585]  [<ffffffff815591bf>] __wait_on_bit+0x5f/0x90
Sep 29 15:26:07 topaz kernel: [709921.727594]  [<ffffffff810f45e3>] wait_on_page_bit+0x73/0x80
Sep 29 15:26:07 topaz kernel: [709921.727604]  [<ffffffff810850f0>] ? wake_bit_function+0x0/0x40
Sep 29 15:26:07 topaz kernel: [709921.727614]  [<ffffffff810fea15>] ? pagevec_lookup_tag+0x25/0x40
Sep 29 15:26:07 topaz kernel: [709921.727623]  [<ffffffff810f4a75>] wait_on_page_writeback_range+0xf5/0x190
Sep 29 15:26:07 topaz kernel: [709921.727635]  [<ffffffff810fdbc1>] ? do_writepages+0x21/0x40
Sep 29 15:26:07 topaz kernel: [709921.727644]  [<ffffffff810f4bcb>] ? __filemap_fdatawrite_range+0x5b/0x60
Sep 29 15:26:07 topaz kernel: [709921.727657]  [<ffffffff810f4c48>] filemap_write_and_wait_range+0x78/0x90
Sep 29 15:26:07 topaz kernel: [709921.727681]  [<ffffffff8116ba8e>] vfs_fsync_range+0x7e/0xe0
Sep 29 15:26:07 topaz kernel: [709921.727697]  [<ffffffff8116bb5d>] vfs_fsync+0x1d/0x20
Sep 29 15:26:07 topaz kernel: [709921.727712]  [<ffffffff8116bb9e>] do_fsync+0x3e/0x60
Sep 29 15:26:07 topaz kernel: [709921.727728]  [<ffffffff8116bbf0>] sys_fsync+0x10/0x20
Sep 29 15:26:07 topaz kernel: [709921.727746]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b
Sep 29 15:26:07 topaz kernel: [709921.727755] INFO: task tar:2926 blocked for more than 120 seconds.
Sep 29 15:26:07 topaz kernel: [709921.740051] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 29 15:26:07 topaz kernel: [709921.764575] tar           D 0000000000000002     0  2926  16813 0x00000004
Sep 29 15:26:07 topaz kernel: [709921.764598]  ffff880211945c48 0000000000000082 0000000000015bc0 0000000000015bc0
Sep 29 15:26:07 topaz kernel: [709921.764625]  ffff88015fa931a0 ffff880211945fd8 0000000000015bc0 ffff88015fa92de0
Sep 29 15:26:07 topaz kernel: [709921.764646]  0000000000015bc0 ffff880211945fd8 0000000000015bc0 ffff88015fa931a0
Sep 29 15:26:07 topaz kernel: [709921.764667] Call Trace:
Sep 29 15:26:07 topaz kernel: [709921.764697]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:26:07 topaz kernel: [709921.764713]  [<ffffffff81558b97>] io_schedule+0x47/0x70
Sep 29 15:26:07 topaz kernel: [709921.764731]  [<ffffffffa01e438e>] nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
Sep 29 15:26:07 topaz kernel: [709921.764742]  [<ffffffff815591bf>] __wait_on_bit+0x5f/0x90
Sep 29 15:26:07 topaz kernel: [709921.764760]  [<ffffffffa01e4380>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Sep 29 15:26:07 topaz kernel: [709921.764776]  [<ffffffff81559268>] out_of_line_wait_on_bit+0x78/0x90
Sep 29 15:26:07 topaz kernel: [709921.764786]  [<ffffffff810850f0>] ? wake_bit_function+0x0/0x40
Sep 29 15:26:07 topaz kernel: [709921.764804]  [<ffffffffa01e436f>] nfs_wait_on_request+0x2f/0x40 [nfs]
Sep 29 15:26:07 topaz kernel: [709921.764822]  [<ffffffffa01e879f>] nfs_wait_on_requests_locked+0x7f/0xd0 [nfs]
Sep 29 15:26:07 topaz kernel: [709921.764841]  [<ffffffffa01e9bde>] nfs_sync_mapping_wait+0x9e/0x1a0 [nfs]
Sep 29 15:26:07 topaz kernel: [709921.764861]  [<ffffffffa01e9fc9>] nfs_write_mapping+0x79/0xb0 [nfs]
Sep 29 15:26:07 topaz kernel: [709921.764878]  [<ffffffffa01ea037>] nfs_wb_all+0x17/0x20 [nfs]
Sep 29 15:26:07 topaz kernel: [709921.764893]  [<ffffffffa01d8f7a>] nfs_do_fsync+0x2a/0x60 [nfs]
Sep 29 15:26:07 topaz kernel: [709921.764907]  [<ffffffffa01d91c5>] nfs_file_flush+0x75/0xa0 [nfs]
Sep 29 15:26:07 topaz kernel: [709921.764919]  [<ffffffff8114225c>] filp_close+0x3c/0x90
Sep 29 15:26:07 topaz kernel: [709921.764927]  [<ffffffff81142367>] sys_close+0xb7/0x120
Sep 29 15:26:07 topaz kernel: [709921.764938]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b
Sep 29 15:28:07 topaz kernel: [710041.760249] INFO: task vi:1505 blocked for more than 120 seconds.
Sep 29 15:28:07 topaz kernel: [710041.772850] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 29 15:28:07 topaz kernel: [710041.797264] vi            D 00000000ffffffff     0  1505   1693 0x00000000
Sep 29 15:28:07 topaz kernel: [710041.797279]  ffff880062adbcc8 0000000000000082 0000000000015bc0 0000000000015bc0
Sep 29 15:28:07 topaz kernel: [710041.797290]  ffff880067c85f80 ffff880062adbfd8 0000000000015bc0 ffff880067c85bc0
Sep 29 15:28:07 topaz kernel: [710041.797299]  0000000000015bc0 ffff880062adbfd8 0000000000015bc0 ffff880067c85f80
Sep 29 15:28:07 topaz kernel: [710041.797310] Call Trace:
Sep 29 15:28:07 topaz kernel: [710041.797327]  [<ffffffff810f43f0>] ? sync_page+0x0/0x50
Sep 29 15:28:07 topaz kernel: [710041.797340]  [<ffffffff81558b97>] io_schedule+0x47/0x70
Sep 29 15:28:07 topaz kernel: [710041.797348]  [<ffffffff810f442d>] sync_page+0x3d/0x50
Sep 29 15:28:07 topaz kernel: [710041.797355]  [<ffffffff815591bf>] __wait_on_bit+0x5f/0x90
Sep 29 15:28:07 topaz kernel: [710041.797361]  [<ffffffff810f45e3>] wait_on_page_bit+0x73/0x80
Sep 29 15:28:07 topaz kernel: [710041.797368]  [<ffffffff810850f0>] ? wake_bit_function+0x0/0x40
Sep 29 15:28:07 topaz kernel: [710041.797375]  [<ffffffff810fea15>] ? pagevec_lookup_tag+0x25/0x40
Sep 29 15:28:07 topaz kernel: [710041.797379]  [<ffffffff810f4a75>] wait_on_page_writeback_range+0xf5/0x190
Sep 29 15:28:07 topaz kernel: [710041.797384]  [<ffffffff810fdbc1>] ? do_writepages+0x21/0x40
Sep 29 15:28:07 topaz kernel: [710041.797389]  [<ffffffff810f4bcb>] ? __filemap_fdatawrite_range+0x5b/0x60
Sep 29 15:28:07 topaz kernel: [710041.797393]  [<ffffffff810f4c48>] filemap_write_and_wait_range+0x78/0x90
Sep 29 15:28:07 topaz kernel: [710041.797404]  [<ffffffff8116ba8e>] vfs_fsync_range+0x7e/0xe0
Sep 29 15:28:07 topaz kernel: [710041.797408]  [<ffffffff8116bb5d>] vfs_fsync+0x1d/0x20
Sep 29 15:28:07 topaz kernel: [710041.797412]  [<ffffffff8116bb9e>] do_fsync+0x3e/0x60
Sep 29 15:28:07 topaz kernel: [710041.797416]  [<ffffffff8116bbf0>] sys_fsync+0x10/0x20
Sep 29 15:28:07 topaz kernel: [710041.797422]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b

-- 
Writing big files to NFS target causes system lock up
https://bugs.launchpad.net/bugs/561210
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