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[Bug 1243429] Re: NFS4 Lockups with 12.04.03/13.04 clients to 12.04.03 server

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Tue, 21 Jan 2014 19:19:02 -0000
Reply-to: Bug 1243429 <1243429@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Summary changed:

- NFS Lockups with 12.04.03/13.04 clients to 12.04.03 server
+ NFS4 Lockups with 12.04.03/13.04 clients to 12.04.03 server

** Description changed:

  After a recent upgrade on my clients to Ubuntu 13.04 latest and Ubuntu
  12.04.03 on the server, NFS4 clients began locking up with the errors
- below.  Processes accessing NFS would hang up and lock, and could not be
- killed or adjusted.  NFSv3 on the same server and client has been
- working fine.
+ below. Processes accessing NFS would hang up and lock, and could not be
+ killed or adjusted. NFS4 was configured with clean defaults, no special
+ options set. No log entries corresponding with the problem were seen on
+ the nfs server.
  
- NFS4 was configured with clean defaults, no special options set.  No log
- entries corresponding with the problem were seen on the nfs server.
+ WORKAROUND: NFSv3 on the same server and client has been working fine.
  
  Oct 22 09:22:57 edmonton kernel: [  324.099094] NFS: nfs4_reclaim_open_state: Lock reclaim failed!
  Oct 22 09:27:34 edmonton kernel: [  600.213861] INFO: task Chrome_CacheThr:3411 blocked for more than 120 seconds.
  Oct 22 09:27:34 edmonton kernel: [  600.213869] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Oct 22 09:27:34 edmonton kernel: [  600.213872] Chrome_CacheThr D ffff88040fc33ec0     0  3411      1 0x00000000
  Oct 22 09:27:34 edmonton kernel: [  600.213880]  ffff8803fce77aa8 0000000000000086 ffff880407749740 ffff8803fce77fd8
  Oct 22 09:27:34 edmonton kernel: [  600.213889]  ffff8803fce77fd8 ffff8803fce77fd8 ffff880409d51740 ffff880407749740
  Oct 22 09:27:34 edmonton kernel: [  600.213895]  ffff880407749740 ffff88040fc34778 0000000000000002 ffffffff8112f420
  Oct 22 09:27:34 edmonton kernel: [  600.213903] Call Trace:
  Oct 22 09:27:34 edmonton kernel: [  600.213918]  [<ffffffff8112f420>] ? __lock_page+0x70/0x70
  Oct 22 09:27:34 edmonton kernel: [  600.213931]  [<ffffffff816cc4c9>] schedule+0x29/0x70
  Oct 22 09:27:34 edmonton kernel: [  600.213937]  [<ffffffff816cc59f>] io_schedule+0x8f/0xd0
  Oct 22 09:27:34 edmonton kernel: [  600.213941]  [<ffffffff8112f42e>] sleep_on_page+0xe/0x20
  Oct 22 09:27:34 edmonton kernel: [  600.213948]  [<ffffffff816caabb>] __wait_on_bit_lock+0x5b/0xc0
  Oct 22 09:27:34 edmonton kernel: [  600.213953]  [<ffffffff8112f417>] __lock_page+0x67/0x70
  Oct 22 09:27:34 edmonton kernel: [  600.213961]  [<ffffffff8107df40>] ? autoremove_wake_function+0x40/0x40
  Oct 22 09:27:34 edmonton kernel: [  600.213965]  [<ffffffff8112ffae>] find_lock_page+0x4e/0x80
  Oct 22 09:27:34 edmonton kernel: [  600.213971]  [<ffffffff811303ac>] grab_cache_page_write_begin+0x6c/0xf0
  Oct 22 09:27:34 edmonton kernel: [  600.213997]  [<ffffffffa01f6d78>] nfs_write_begin+0x78/0x230 [nfs]
  Oct 22 09:27:34 edmonton kernel: [  600.214003]  [<ffffffff8112f1e3>] generic_file_buffered_write+0x113/0x270
  Oct 22 09:27:34 edmonton kernel: [  600.214010]  [<ffffffff81130ea4>] __generic_file_aio_write+0x1b4/0x3d0
  Oct 22 09:27:34 edmonton kernel: [  600.214018]  [<ffffffff81196ac4>] ? __sb_start_write+0x54/0x110
  Oct 22 09:27:34 edmonton kernel: [  600.214023]  [<ffffffff8113113f>] generic_file_aio_write+0x7f/0x100
  Oct 22 09:27:34 edmonton kernel: [  600.214035]  [<ffffffffa01f7391>] nfs_file_write+0xc1/0x1e0 [nfs]
  Oct 22 09:27:34 edmonton kernel: [  600.214041]  [<ffffffff81194337>] do_sync_write+0xa7/0xe0
  Oct 22 09:27:34 edmonton kernel: [  600.214046]  [<ffffffff81194a1c>] vfs_write+0xac/0x180
  Oct 22 09:27:34 edmonton kernel: [  600.214051]  [<ffffffff81194efa>] sys_pwrite64+0x9a/0xb0
  Oct 22 09:27:34 edmonton kernel: [  600.214058]  [<ffffffff816d5c5d>] system_call_fastpath+0x1a/0x1f
  Oct 22 09:29:27 edmonton avahi-daemon[1613]: Invalid response packet from host 128.111.246.200.
  Oct 22 09:29:27 edmonton avahi-daemon[1613]: Invalid response packet from host fe80::3aea:a7ff:fe6e:e945.
  Oct 22 09:29:34 edmonton kernel: [  720.042124] INFO: task Chrome_CacheThr:3411 blocked for more than 120 seconds.
  Oct 22 09:29:34 edmonton kernel: [  720.042131] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Oct 22 09:29:34 edmonton kernel: [  720.042134] Chrome_CacheThr D ffff88040fc33ec0     0  3411      1 0x00000000
  Oct 22 09:29:34 edmonton kernel: [  720.042142]  ffff8803fce77aa8 0000000000000086 ffff880407749740 ffff8803fce77fd8
  Oct 22 09:29:34 edmonton kernel: [  720.042151]  ffff8803fce77fd8 ffff8803fce77fd8 ffff880409d51740 ffff880407749740
  Oct 22 09:29:34 edmonton kernel: [  720.042157]  ffff880407749740 ffff88040fc34778 0000000000000002 ffffffff8112f420
  Oct 22 09:29:34 edmonton kernel: [  720.042165] Call Trace:
  Oct 22 09:29:34 edmonton kernel: [  720.042181]  [<ffffffff8112f420>] ? __lock_page+0x70/0x70
  Oct 22 09:29:34 edmonton kernel: [  720.042193]  [<ffffffff816cc4c9>] schedule+0x29/0x70
  Oct 22 09:29:34 edmonton kernel: [  720.042199]  [<ffffffff816cc59f>] io_schedule+0x8f/0xd0
  Oct 22 09:29:34 edmonton kernel: [  720.042204]  [<ffffffff8112f42e>] sleep_on_page+0xe/0x20
  Oct 22 09:29:34 edmonton kernel: [  720.042210]  [<ffffffff816caabb>] __wait_on_bit_lock+0x5b/0xc0
  Oct 22 09:29:34 edmonton kernel: [  720.042215]  [<ffffffff8112f417>] __lock_page+0x67/0x70
  Oct 22 09:29:34 edmonton kernel: [  720.042223]  [<ffffffff8107df40>] ? autoremove_wake_function+0x40/0x40
  Oct 22 09:29:34 edmonton kernel: [  720.042228]  [<ffffffff8112ffae>] find_lock_page+0x4e/0x80
  Oct 22 09:29:34 edmonton kernel: [  720.042233]  [<ffffffff811303ac>] grab_cache_page_write_begin+0x6c/0xf0
  Oct 22 09:29:34 edmonton kernel: [  720.042259]  [<ffffffffa01f6d78>] nfs_write_begin+0x78/0x230 [nfs]
  Oct 22 09:29:34 edmonton kernel: [  720.042264]  [<ffffffff8112f1e3>] generic_file_buffered_write+0x113/0x270
  Oct 22 09:29:34 edmonton kernel: [  720.042271]  [<ffffffff81130ea4>] __generic_file_aio_write+0x1b4/0x3d0
  Oct 22 09:29:34 edmonton kernel: [  720.042278]  [<ffffffff81196ac4>] ? __sb_start_write+0x54/0x110
  Oct 22 09:29:34 edmonton kernel: [  720.042283]  [<ffffffff8113113f>] generic_file_aio_write+0x7f/0x100
  Oct 22 09:29:34 edmonton kernel: [  720.042295]  [<ffffffffa01f7391>] nfs_file_write+0xc1/0x1e0 [nfs]
  Oct 22 09:29:34 edmonton kernel: [  720.042301]  [<ffffffff81194337>] do_sync_write+0xa7/0xe0
  Oct 22 09:29:34 edmonton kernel: [  720.042307]  [<ffffffff81194a1c>] vfs_write+0xac/0x180
  Oct 22 09:29:34 edmonton kernel: [  720.042312]  [<ffffffff81194efa>] sys_pwrite64+0x9a/0xb0
  Oct 22 09:29:34 edmonton kernel: [  720.042318]  [<ffffffff816d5c5d>] system_call_fastpath+0x1a/0x1f
  Oct 22 09:29:34 edmonton kernel: [  720.042323] INFO: task Chrome_SyncThre:3462 blocked for more than 120 seconds.
  Oct 22 09:29:34 edmonton kernel: [  720.042325] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Oct 22 09:29:34 edmonton kernel: [  720.042327] Chrome_SyncThre D ffff88040fc13ec0     0  3462      1 0x00000000
  Oct 22 09:29:34 edmonton kernel: [  720.042332]  ffff8803f8d01d20 0000000000000086 ffff8803fced9740 ffff8803f8d01fd8
  Oct 22 09:29:34 edmonton kernel: [  720.042339]  ffff8803f8d01fd8 ffff8803f8d01fd8 ffff880407460000 ffff8803fced9740
  Oct 22 09:29:34 edmonton kernel: [  720.042345]  ffff8803fced9740 ffff88040fc14778 0000000000000002 ffffffff8112f420
  Oct 22 09:29:34 edmonton kernel: [  720.042352] Call Trace:
  Oct 22 09:29:34 edmonton kernel: [  720.042357]  [<ffffffff8112f420>] ? __lock_page+0x70/0x70
  Oct 22 09:29:34 edmonton kernel: [  720.042362]  [<ffffffff816cc4c9>] schedule+0x29/0x70
  Oct 22 09:29:34 edmonton kernel: [  720.042368]  [<ffffffff816cc59f>] io_schedule+0x8f/0xd0
  Oct 22 09:29:34 edmonton kernel: [  720.042373]  [<ffffffff8112f42e>] sleep_on_page+0xe/0x20
  Oct 22 09:29:34 edmonton kernel: [  720.042378]  [<ffffffff816cac10>] __wait_on_bit+0x60/0x90
  Oct 22 09:29:34 edmonton kernel: [  720.042383]  [<ffffffff8112f560>] wait_on_page_bit+0x80/0x90
  Oct 22 09:29:34 edmonton kernel: [  720.042388]  [<ffffffff8107df40>] ? autoremove_wake_function+0x40/0x40
  Oct 22 09:29:34 edmonton kernel: [  720.042392]  [<ffffffff8112fa61>] filemap_fdatawait_range+0x101/0x190
  Oct 22 09:29:34 edmonton kernel: [  720.042402]  [<ffffffff8113aa4e>] ? do_writepages+0x1e/0x40
  Oct 22 09:29:34 edmonton kernel: [  720.042407]  [<ffffffff81130ad1>] ? __filemap_fdatawrite_range+0x51/0x60
  Oct 22 09:29:34 edmonton kernel: [  720.042412]  [<ffffffff81130b45>] filemap_write_and_wait_range+0x65/0x70
  Oct 22 09:29:34 edmonton kernel: [  720.042432]  [<ffffffffa040bd77>] nfs4_file_fsync+0x67/0xb0 [nfsv4]
  Oct 22 09:29:34 edmonton kernel: [  720.042440]  [<ffffffff811c42cd>] do_fsync+0x5d/0x90
  Oct 22 09:29:34 edmonton kernel: [  720.042445]  [<ffffffff81194cdb>] ? sys_read+0x6b/0xa0
  Oct 22 09:29:34 edmonton kernel: [  720.042450]  [<ffffffff811c4553>] sys_fdatasync+0x13/0x20
  Oct 22 09:29:34 edmonton kernel: [  720.042455]  [<ffffffff816d5c5d>] system_call_fastpath+0x1a/0x1f
- --- 
+ ---
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  CRDA: Error: [Errno 2] No such file or directory
  CurrentDmesg:
-  [13754.380124] RAID1 conf printout:
-  [13754.380130]  --- wd:2 rd:2
-  [13754.380134]  disk 0, wo:0, o:1, dev:sda2
-  [13754.380138]  disk 1, wo:0, o:1, dev:sdb2
+  [13754.380124] RAID1 conf printout:
+  [13754.380130]  --- wd:2 rd:2
+  [13754.380134]  disk 0, wo:0, o:1, dev:sda2
+  [13754.380138]  disk 1, wo:0, o:1, dev:sdb2
  DistroRelease: Ubuntu 13.04
  HibernationDevice: RESUME=UUID=35eed7b2-b555-4c5c-85e4-3e1e6bf41b33
  IwConfig:
-  eth1      no wireless extensions.
-  
-  lo        no wireless extensions.
-  
-  em1       no wireless extensions.
+  eth1      no wireless extensions.
+ 
+  lo        no wireless extensions.
+ 
+  em1       no wireless extensions.
  MachineType: Hewlett-Packard HP Z620 Workstation
  MarkForUpload: True
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcEnviron:
-  TERM=vt100
-  PATH=(custom, no user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=vt100
+  PATH=(custom, no user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcFB:
-  
+ 
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-32-generic root=UUID=9aa39330-e452-4869-bfea-73ca72f9ba91 ro splash quiet
  ProcVersionSignature: Ubuntu 3.8.0-32.47-generic 3.8.13.10
  PulseList:
-  Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
-  No PulseAudio daemon running, or not running as session daemon.
+  Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
+  No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
-  linux-restricted-modules-3.8.0-32-generic N/A
-  linux-backports-modules-3.8.0-32-generic  N/A
-  linux-firmware                            1.106
+  linux-restricted-modules-3.8.0-32-generic N/A
+  linux-backports-modules-3.8.0-32-generic  N/A
+  linux-firmware                            1.106
  RfKill:
-  
+ 
  Tags:  raring
  Uname: Linux 3.8.0-32-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
-  
+ 
  dmi.bios.date: 05/09/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: J61 v03.15
  dmi.board.asset.tag: 2UA322159J
  dmi.board.name: 158A
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 0.00
  dmi.chassis.asset.tag: 2UA322159J
  dmi.chassis.type: 6
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrJ61v03.15:bd05/09/2013:svnHewlett-Packard:pnHPZ620Workstation:pvr:rvnHewlett-Packard:rn158A:rvr0.00:cvnHewlett-Packard:ct6:cvr:
  dmi.product.name: HP Z620 Workstation
  dmi.sys.vendor: Hewlett-Packard

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https://bugs.launchpad.net/bugs/1243429

Title:
  NFS4 Lockups with 12.04.03/13.04 clients to 12.04.03 server

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  After a recent upgrade on my clients to Ubuntu 13.04 latest and Ubuntu
  12.04.03 on the server, NFS4 clients began locking up with the errors
  below. Processes accessing NFS would hang up and lock, and could not
  be killed or adjusted. NFS4 was configured with clean defaults, no
  special options set. No log entries corresponding with the problem
  were seen on the nfs server.

  WORKAROUND: NFSv3 on the same server and client has been working fine.

  Oct 22 09:22:57 edmonton kernel: [  324.099094] NFS: nfs4_reclaim_open_state: Lock reclaim failed!
  Oct 22 09:27:34 edmonton kernel: [  600.213861] INFO: task Chrome_CacheThr:3411 blocked for more than 120 seconds.
  Oct 22 09:27:34 edmonton kernel: [  600.213869] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Oct 22 09:27:34 edmonton kernel: [  600.213872] Chrome_CacheThr D ffff88040fc33ec0     0  3411      1 0x00000000
  Oct 22 09:27:34 edmonton kernel: [  600.213880]  ffff8803fce77aa8 0000000000000086 ffff880407749740 ffff8803fce77fd8
  Oct 22 09:27:34 edmonton kernel: [  600.213889]  ffff8803fce77fd8 ffff8803fce77fd8 ffff880409d51740 ffff880407749740
  Oct 22 09:27:34 edmonton kernel: [  600.213895]  ffff880407749740 ffff88040fc34778 0000000000000002 ffffffff8112f420
  Oct 22 09:27:34 edmonton kernel: [  600.213903] Call Trace:
  Oct 22 09:27:34 edmonton kernel: [  600.213918]  [<ffffffff8112f420>] ? __lock_page+0x70/0x70
  Oct 22 09:27:34 edmonton kernel: [  600.213931]  [<ffffffff816cc4c9>] schedule+0x29/0x70
  Oct 22 09:27:34 edmonton kernel: [  600.213937]  [<ffffffff816cc59f>] io_schedule+0x8f/0xd0
  Oct 22 09:27:34 edmonton kernel: [  600.213941]  [<ffffffff8112f42e>] sleep_on_page+0xe/0x20
  Oct 22 09:27:34 edmonton kernel: [  600.213948]  [<ffffffff816caabb>] __wait_on_bit_lock+0x5b/0xc0
  Oct 22 09:27:34 edmonton kernel: [  600.213953]  [<ffffffff8112f417>] __lock_page+0x67/0x70
  Oct 22 09:27:34 edmonton kernel: [  600.213961]  [<ffffffff8107df40>] ? autoremove_wake_function+0x40/0x40
  Oct 22 09:27:34 edmonton kernel: [  600.213965]  [<ffffffff8112ffae>] find_lock_page+0x4e/0x80
  Oct 22 09:27:34 edmonton kernel: [  600.213971]  [<ffffffff811303ac>] grab_cache_page_write_begin+0x6c/0xf0
  Oct 22 09:27:34 edmonton kernel: [  600.213997]  [<ffffffffa01f6d78>] nfs_write_begin+0x78/0x230 [nfs]
  Oct 22 09:27:34 edmonton kernel: [  600.214003]  [<ffffffff8112f1e3>] generic_file_buffered_write+0x113/0x270
  Oct 22 09:27:34 edmonton kernel: [  600.214010]  [<ffffffff81130ea4>] __generic_file_aio_write+0x1b4/0x3d0
  Oct 22 09:27:34 edmonton kernel: [  600.214018]  [<ffffffff81196ac4>] ? __sb_start_write+0x54/0x110
  Oct 22 09:27:34 edmonton kernel: [  600.214023]  [<ffffffff8113113f>] generic_file_aio_write+0x7f/0x100
  Oct 22 09:27:34 edmonton kernel: [  600.214035]  [<ffffffffa01f7391>] nfs_file_write+0xc1/0x1e0 [nfs]
  Oct 22 09:27:34 edmonton kernel: [  600.214041]  [<ffffffff81194337>] do_sync_write+0xa7/0xe0
  Oct 22 09:27:34 edmonton kernel: [  600.214046]  [<ffffffff81194a1c>] vfs_write+0xac/0x180
  Oct 22 09:27:34 edmonton kernel: [  600.214051]  [<ffffffff81194efa>] sys_pwrite64+0x9a/0xb0
  Oct 22 09:27:34 edmonton kernel: [  600.214058]  [<ffffffff816d5c5d>] system_call_fastpath+0x1a/0x1f
  Oct 22 09:29:27 edmonton avahi-daemon[1613]: Invalid response packet from host 128.111.246.200.
  Oct 22 09:29:27 edmonton avahi-daemon[1613]: Invalid response packet from host fe80::3aea:a7ff:fe6e:e945.
  Oct 22 09:29:34 edmonton kernel: [  720.042124] INFO: task Chrome_CacheThr:3411 blocked for more than 120 seconds.
  Oct 22 09:29:34 edmonton kernel: [  720.042131] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Oct 22 09:29:34 edmonton kernel: [  720.042134] Chrome_CacheThr D ffff88040fc33ec0     0  3411      1 0x00000000
  Oct 22 09:29:34 edmonton kernel: [  720.042142]  ffff8803fce77aa8 0000000000000086 ffff880407749740 ffff8803fce77fd8
  Oct 22 09:29:34 edmonton kernel: [  720.042151]  ffff8803fce77fd8 ffff8803fce77fd8 ffff880409d51740 ffff880407749740
  Oct 22 09:29:34 edmonton kernel: [  720.042157]  ffff880407749740 ffff88040fc34778 0000000000000002 ffffffff8112f420
  Oct 22 09:29:34 edmonton kernel: [  720.042165] Call Trace:
  Oct 22 09:29:34 edmonton kernel: [  720.042181]  [<ffffffff8112f420>] ? __lock_page+0x70/0x70
  Oct 22 09:29:34 edmonton kernel: [  720.042193]  [<ffffffff816cc4c9>] schedule+0x29/0x70
  Oct 22 09:29:34 edmonton kernel: [  720.042199]  [<ffffffff816cc59f>] io_schedule+0x8f/0xd0
  Oct 22 09:29:34 edmonton kernel: [  720.042204]  [<ffffffff8112f42e>] sleep_on_page+0xe/0x20
  Oct 22 09:29:34 edmonton kernel: [  720.042210]  [<ffffffff816caabb>] __wait_on_bit_lock+0x5b/0xc0
  Oct 22 09:29:34 edmonton kernel: [  720.042215]  [<ffffffff8112f417>] __lock_page+0x67/0x70
  Oct 22 09:29:34 edmonton kernel: [  720.042223]  [<ffffffff8107df40>] ? autoremove_wake_function+0x40/0x40
  Oct 22 09:29:34 edmonton kernel: [  720.042228]  [<ffffffff8112ffae>] find_lock_page+0x4e/0x80
  Oct 22 09:29:34 edmonton kernel: [  720.042233]  [<ffffffff811303ac>] grab_cache_page_write_begin+0x6c/0xf0
  Oct 22 09:29:34 edmonton kernel: [  720.042259]  [<ffffffffa01f6d78>] nfs_write_begin+0x78/0x230 [nfs]
  Oct 22 09:29:34 edmonton kernel: [  720.042264]  [<ffffffff8112f1e3>] generic_file_buffered_write+0x113/0x270
  Oct 22 09:29:34 edmonton kernel: [  720.042271]  [<ffffffff81130ea4>] __generic_file_aio_write+0x1b4/0x3d0
  Oct 22 09:29:34 edmonton kernel: [  720.042278]  [<ffffffff81196ac4>] ? __sb_start_write+0x54/0x110
  Oct 22 09:29:34 edmonton kernel: [  720.042283]  [<ffffffff8113113f>] generic_file_aio_write+0x7f/0x100
  Oct 22 09:29:34 edmonton kernel: [  720.042295]  [<ffffffffa01f7391>] nfs_file_write+0xc1/0x1e0 [nfs]
  Oct 22 09:29:34 edmonton kernel: [  720.042301]  [<ffffffff81194337>] do_sync_write+0xa7/0xe0
  Oct 22 09:29:34 edmonton kernel: [  720.042307]  [<ffffffff81194a1c>] vfs_write+0xac/0x180
  Oct 22 09:29:34 edmonton kernel: [  720.042312]  [<ffffffff81194efa>] sys_pwrite64+0x9a/0xb0
  Oct 22 09:29:34 edmonton kernel: [  720.042318]  [<ffffffff816d5c5d>] system_call_fastpath+0x1a/0x1f
  Oct 22 09:29:34 edmonton kernel: [  720.042323] INFO: task Chrome_SyncThre:3462 blocked for more than 120 seconds.
  Oct 22 09:29:34 edmonton kernel: [  720.042325] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Oct 22 09:29:34 edmonton kernel: [  720.042327] Chrome_SyncThre D ffff88040fc13ec0     0  3462      1 0x00000000
  Oct 22 09:29:34 edmonton kernel: [  720.042332]  ffff8803f8d01d20 0000000000000086 ffff8803fced9740 ffff8803f8d01fd8
  Oct 22 09:29:34 edmonton kernel: [  720.042339]  ffff8803f8d01fd8 ffff8803f8d01fd8 ffff880407460000 ffff8803fced9740
  Oct 22 09:29:34 edmonton kernel: [  720.042345]  ffff8803fced9740 ffff88040fc14778 0000000000000002 ffffffff8112f420
  Oct 22 09:29:34 edmonton kernel: [  720.042352] Call Trace:
  Oct 22 09:29:34 edmonton kernel: [  720.042357]  [<ffffffff8112f420>] ? __lock_page+0x70/0x70
  Oct 22 09:29:34 edmonton kernel: [  720.042362]  [<ffffffff816cc4c9>] schedule+0x29/0x70
  Oct 22 09:29:34 edmonton kernel: [  720.042368]  [<ffffffff816cc59f>] io_schedule+0x8f/0xd0
  Oct 22 09:29:34 edmonton kernel: [  720.042373]  [<ffffffff8112f42e>] sleep_on_page+0xe/0x20
  Oct 22 09:29:34 edmonton kernel: [  720.042378]  [<ffffffff816cac10>] __wait_on_bit+0x60/0x90
  Oct 22 09:29:34 edmonton kernel: [  720.042383]  [<ffffffff8112f560>] wait_on_page_bit+0x80/0x90
  Oct 22 09:29:34 edmonton kernel: [  720.042388]  [<ffffffff8107df40>] ? autoremove_wake_function+0x40/0x40
  Oct 22 09:29:34 edmonton kernel: [  720.042392]  [<ffffffff8112fa61>] filemap_fdatawait_range+0x101/0x190
  Oct 22 09:29:34 edmonton kernel: [  720.042402]  [<ffffffff8113aa4e>] ? do_writepages+0x1e/0x40
  Oct 22 09:29:34 edmonton kernel: [  720.042407]  [<ffffffff81130ad1>] ? __filemap_fdatawrite_range+0x51/0x60
  Oct 22 09:29:34 edmonton kernel: [  720.042412]  [<ffffffff81130b45>] filemap_write_and_wait_range+0x65/0x70
  Oct 22 09:29:34 edmonton kernel: [  720.042432]  [<ffffffffa040bd77>] nfs4_file_fsync+0x67/0xb0 [nfsv4]
  Oct 22 09:29:34 edmonton kernel: [  720.042440]  [<ffffffff811c42cd>] do_fsync+0x5d/0x90
  Oct 22 09:29:34 edmonton kernel: [  720.042445]  [<ffffffff81194cdb>] ? sys_read+0x6b/0xa0
  Oct 22 09:29:34 edmonton kernel: [  720.042450]  [<ffffffff811c4553>] sys_fdatasync+0x13/0x20
  Oct 22 09:29:34 edmonton kernel: [  720.042455]  [<ffffffff816d5c5d>] system_call_fastpath+0x1a/0x1f
  ---
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  CRDA: Error: [Errno 2] No such file or directory
  CurrentDmesg:
   [13754.380124] RAID1 conf printout:
   [13754.380130]  --- wd:2 rd:2
   [13754.380134]  disk 0, wo:0, o:1, dev:sda2
   [13754.380138]  disk 1, wo:0, o:1, dev:sdb2
  DistroRelease: Ubuntu 13.04
  HibernationDevice: RESUME=UUID=35eed7b2-b555-4c5c-85e4-3e1e6bf41b33
  IwConfig:
   eth1      no wireless extensions.

   lo        no wireless extensions.

   em1       no wireless extensions.
  MachineType: Hewlett-Packard HP Z620 Workstation
  MarkForUpload: True
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcEnviron:
   TERM=vt100
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-32-generic root=UUID=9aa39330-e452-4869-bfea-73ca72f9ba91 ro splash quiet
  ProcVersionSignature: Ubuntu 3.8.0-32.47-generic 3.8.13.10
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-32-generic N/A
   linux-backports-modules-3.8.0-32-generic  N/A
   linux-firmware                            1.106
  RfKill:

  Tags:  raring
  Uname: Linux 3.8.0-32-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  dmi.bios.date: 05/09/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: J61 v03.15
  dmi.board.asset.tag: 2UA322159J
  dmi.board.name: 158A
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 0.00
  dmi.chassis.asset.tag: 2UA322159J
  dmi.chassis.type: 6
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrJ61v03.15:bd05/09/2013:svnHewlett-Packard:pnHPZ620Workstation:pvr:rvnHewlett-Packard:rn158A:rvr0.00:cvnHewlett-Packard:ct6:cvr:
  dmi.product.name: HP Z620 Workstation
  dmi.sys.vendor: Hewlett-Packard

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