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[Bug 1250828] Re: freeze on diskIO without real IO

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: jl451 <jl451@xxxxxxxxx>
Date: Mon, 16 Dec 2013 17:44:16 -0000
Reply-to: Bug 1250828 <1250828@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
uname -a

Linux Ubunto4ka 3.12.5-031205-generic #201312120254 SMP Thu Dec 12 07:55:20 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12.5-trusty/

cat /var/log/syslog |grep -A 35 blocked

Dec  6 16:12:23 Ubunto4ka kernel: [95836.316381] INFO: task mozStorage #8:8285 blocked for more than 5 seconds.
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316385]       Tainted: PF        C O 3.12.2-031202-generic #201311291538
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316385] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316387] mozStorage #8   D ffffffff81811d80     0  8285   7860 0x00000000
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316390]  ffff880062f21d28 0000000000000002 ffff8801389e2b40 ffff8800371e0f30
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316392]  ffff880062f21fd8 ffff880062f21fd8 ffff880062f21fd8 0000000000014500
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316394]  ffff880139378000 ffff88006d025ec0 ffff880062f21d38 ffff8800ba5f8000
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316397] Call Trace:
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316402]  [<ffffffff8174dbb9>] schedule+0x29/0x70
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316423]  [<ffffffffa009d30c>] wait_log_commit.isra.21+0x10c/0x130 [btrfs]
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316427]  [<ffffffff8108d2a0>] ? add_wait_queue+0x60/0x60
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316437]  [<ffffffffa00a2ed2>] btrfs_sync_log+0x442/0x6d0 [btrfs]
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316440]  [<ffffffff811d6ac0>] ? dput+0x20/0x90
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316449]  [<ffffffffa0077b9b>] btrfs_sync_file+0x27b/0x2e0 [btrfs]
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316452]  [<ffffffff811ef2eb>] vfs_fsync+0x2b/0x40
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316454]  [<ffffffff812c827d>] ecryptfs_fsync+0x3d/0x50
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316456]  [<ffffffff811ef3cd>] do_fsync+0x5d/0x90
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316457]  [<ffffffff811ef7b0>] SyS_fsync+0x10/0x20
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316459]  [<ffffffff817587ff>] tracesys+0xe1/0xe6
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316461] INFO: task mozStorage #11:7286 blocked for more than 5 seconds.
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316462]       Tainted: PF        C O 3.12.2-031202-generic #201311291538
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316463] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316464] mozStorage #11  D ffffffff81811d80     0  7286   7860 0x00000000
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316466]  ffff880008ce3d28 0000000000000002 ffff8801389a4000 ffff880037120c60
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316468]  ffff880008ce3fd8 ffff880008ce3fd8 ffff880008ce3fd8 0000000000014500
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316470]  ffff88013935dec0 ffff880008a90000 ffff880008ce3d38 ffff8800ba5f8000
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316472] Call Trace:
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316474]  [<ffffffff8174dbb9>] schedule+0x29/0x70
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316483]  [<ffffffffa009d30c>] wait_log_commit.isra.21+0x10c/0x130 [btrfs]
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316485]  [<ffffffff8108d2a0>] ? add_wait_queue+0x60/0x60
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316494]  [<ffffffffa00a2ed2>] btrfs_sync_log+0x442/0x6d0 [btrfs]
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316496]  [<ffffffff811d6ac0>] ? dput+0x20/0x90
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316505]  [<ffffffffa0077b9b>] btrfs_sync_file+0x27b/0x2e0 [btrfs]
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316507]  [<ffffffff811ef2eb>] vfs_fsync+0x2b/0x40
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316509]  [<ffffffff812c827d>] ecryptfs_fsync+0x3d/0x50
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316510]  [<ffffffff811ef3cd>] do_fsync+0x5d/0x90
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316512]  [<ffffffff811ef7b0>] SyS_fsync+0x10/0x20
Dec  6 16:12:23 Ubunto4ka kernel: [95836.316513]  [<ffffffff817587ff>] tracesys+0xe1/0xe6
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315297] INFO: task Cache I/O:8165 blocked for more than 5 seconds.
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315300]       Tainted: PF        C O 3.12.2-031202-generic #201311291538
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315301] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315302] Cache I/O       D ffffffff81811d80     0  8165   7860 0x00000000
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315305]  ffff880122501d28 0000000000000002 ffff880037250be0 ffff880138917b40
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315308]  ffff880122501fd8 ffff880122501fd8 ffff880122501fd8 0000000000014500
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315310]  ffffffff81c144a0 ffff8801289e97b0 ffff880122501d38 ffff8800ba5f8000
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315313] Call Trace:
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315318]  [<ffffffff8174dbb9>] schedule+0x29/0x70
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315346]  [<ffffffffa009d30c>] wait_log_commit.isra.21+0x10c/0x130 [btrfs]
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315350]  [<ffffffff8108d2a0>] ? add_wait_queue+0x60/0x60
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315359]  [<ffffffffa00a2ed2>] btrfs_sync_log+0x442/0x6d0 [btrfs]
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315362]  [<ffffffff811d6ac0>] ? dput+0x20/0x90
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315371]  [<ffffffffa0077b9b>] btrfs_sync_file+0x27b/0x2e0 [btrfs]
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315374]  [<ffffffff811ef2eb>] vfs_fsync+0x2b/0x40
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315376]  [<ffffffff812c827d>] ecryptfs_fsync+0x3d/0x50
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315378]  [<ffffffff811ef3cd>] do_fsync+0x5d/0x90
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315380]  [<ffffffff811ef7b0>] SyS_fsync+0x10/0x20
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315382]  [<ffffffff817587ff>] tracesys+0xe1/0xe6
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315385] INFO: task mozStorage #8:8285 blocked for more than 5 seconds.
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315386]       Tainted: PF        C O 3.12.2-031202-generic #201311291538
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315387] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315388] mozStorage #8   D ffffffff81811d80     0  8285   7860 0x00000000
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315390]  ffff880062f21d28 0000000000000002 ffff8801389e2b40 ffff8800371e0f30
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315392]  ffff880062f21fd8 ffff880062f21fd8 ffff880062f21fd8 0000000000014500
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315393]  ffff880139378000 ffff88006d025ec0 ffff880062f21d38 ffff8800ba5f8000
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315395] Call Trace:
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315397]  [<ffffffff8174dbb9>] schedule+0x29/0x70
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315406]  [<ffffffffa009d30c>] wait_log_commit.isra.21+0x10c/0x130 [btrfs]
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315408]  [<ffffffff8108d2a0>] ? add_wait_queue+0x60/0x60
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315416]  [<ffffffffa00a2ed2>] btrfs_sync_log+0x442/0x6d0 [btrfs]
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315418]  [<ffffffff811d6ac0>] ? dput+0x20/0x90
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315427]  [<ffffffffa0077b9b>] btrfs_sync_file+0x27b/0x2e0 [btrfs]
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315428]  [<ffffffff811ef2eb>] vfs_fsync+0x2b/0x40
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315430]  [<ffffffff812c827d>] ecryptfs_fsync+0x3d/0x50
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315431]  [<ffffffff811ef3cd>] do_fsync+0x5d/0x90
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315433]  [<ffffffff811ef7b0>] SyS_fsync+0x10/0x20
Dec  6 16:12:28 Ubunto4ka kernel: [95841.315435]  [<ffffffff817587ff>] tracesys+0xe1/0xe6
Dec  6 16:14:33 Ubunto4ka kernel: [95965.758438] ieee80211 phy0: invalid plcp cck rate (0).
Dec  6 16:15:04 Ubunto4ka kernel: [95997.380539] ieee80211 phy0: invalid plcp cck rate (0).
Dec  6 16:15:05 Ubunto4ka kernel: [95998.633463] ieee80211 phy0: invalid plcp cck rate (0).
Dec  6 16:15:08 Ubunto4ka acpid: client 7845[0:0] has disconnected
Dec  6 16:15:10 Ubunto4ka acpid: client 7845[0:0] has disconnected
Dec  6 16:15:12 Ubunto4ka kernel: [96005.713727] ieee80211 phy0: invalid plcp cck rate (0).
Dec  6 16:15:13 Ubunto4ka kernel: [96005.892061] ieee80211 phy0: invalid plcp cck rate (0).
Dec  6 16:15:17 Ubunto4ka kernel: [96010.085857] ieee80211 phy0: invalid plcp cck rate (0).
Dec  6 16:15:25 Ubunto4ka kernel: [96018.304614] ieee80211 phy0: invalid plcp cck rate (0).
Dec  6 16:15:31 Ubunto4ka kernel: [96023.907088] ieee80211 phy0: invalid plcp cck rate (0).
Dec  6 16:15:36 Ubunto4ka kernel: [96028.807513] ieee80211 phy0: invalid plcp cck rate (0).
Dec  6 16:15:37 Ubunto4ka kernel: [96030.105467] ieee80211 phy0: invalid plcp cck rate (0).
Dec  6 16:15:46 Ubunto4ka kernel: [96039.016403] ieee80211 phy0: invalid plcp cck rate (0).
Dec  6 16:15:46 Ubunto4ka kernel: [96039.297589] ieee80211 phy0: invalid plcp cck rate (0).
Dec  6 16:15:47 Ubunto4ka acpid: client connected from 7845[0:0]
Dec  6 16:15:47 Ubunto4ka acpid: 1 client rule loaded
Dec  6 16:15:48 Ubunto4ka acpid: client connected from 7845[0:0]
--
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.414629] INFO: task enlightenment:2676 blocked for more than 120 seconds.
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.414729]       Tainted: PF        C O 3.12.5-031205-generic #201312120254
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.414823] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.414941] enlightenment   D ffffffff81811d80     0  2676   2671 0x00000000
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.414944]  ffff88009fe4f9e8 0000000000000002 ffff8801371b21a0 ffff880136eb4800
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.414947]  ffff88009fe4ffd8 ffff88009fe4ffd8 ffff88009fe4ffd8 0000000000014500
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.414949]  ffff88013935c710 ffff8800ac70c710 ffff88009fe4f9f8 ffff8801389890a0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.414951] Call Trace:
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.414956]  [<ffffffff8174f189>] schedule+0x29/0x70
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.414976]  [<ffffffffa00653a1>] wait_current_trans.isra.33+0xc1/0x120 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.414979]  [<ffffffff8108d380>] ? add_wait_queue+0x60/0x60
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.414988]  [<ffffffffa006720e>] start_transaction.part.35+0x2ee/0x510 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.414996]  [<ffffffffa0067459>] start_transaction+0x29/0x30 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415004]  [<ffffffffa00676ab>] btrfs_start_transaction+0x1b/0x20 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415012]  [<ffffffffa0075596>] btrfs_create+0x46/0x220 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415015]  [<ffffffff81300a2c>] ? security_inode_permission+0x1c/0x30
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415017]  [<ffffffff811cf81d>] vfs_create+0xed/0x160
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415020]  [<ffffffff812c98a7>] ecryptfs_do_create+0x57/0x130
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415021]  [<ffffffff812ca97b>] ecryptfs_create+0x2b/0xc0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415023]  [<ffffffff811cf81d>] vfs_create+0xed/0x160
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415025]  [<ffffffff811cf9ce>] lookup_open+0x13e/0x1d0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415028]  [<ffffffff811e0168>] ? __mnt_want_write+0x58/0x70
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415029]  [<ffffffff811cfd46>] do_last+0x2e6/0x7c0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415031]  [<ffffffff811d02e4>] path_openat+0xc4/0x4c0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415033]  [<ffffffff811d1013>] do_filp_open+0x43/0xa0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415035]  [<ffffffff811dd90e>] ? __alloc_fd+0xce/0x120
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415038]  [<ffffffff811bf6c2>] do_sys_open+0x132/0x220
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415041]  [<ffffffff8102297d>] ? syscall_trace_leave+0xdd/0x150
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415043]  [<ffffffff811bf7ce>] SyS_open+0x1e/0x20
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415046]  [<ffffffff81759dff>] tracesys+0xe1/0xe6
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415053] INFO: task firefox:3334 blocked for more than 120 seconds.
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415148]       Tainted: PF        C O 3.12.5-031205-generic #201312120254
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415242] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415360] firefox         D ffffffff81811d80     0  3334   2676 0x00000000
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415362]  ffff88012cffd948 0000000000000002 ffff8801371b21a0 ffff880136eb4800
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415363]  ffff88012cffdfd8 ffff88012cffdfd8 ffff88012cffdfd8 0000000000014500
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415365]  ffff880139378000 ffff88007dd1af60 ffff88012cffd958 ffff8801389890a0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415367] Call Trace:
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415369]  [<ffffffff8174f189>] schedule+0x29/0x70
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415377]  [<ffffffffa00653a1>] wait_current_trans.isra.33+0xc1/0x120 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415379]  [<ffffffff8108d380>] ? add_wait_queue+0x60/0x60
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415387]  [<ffffffffa006720e>] start_transaction.part.35+0x2ee/0x510 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415394]  [<ffffffffa0067459>] start_transaction+0x29/0x30 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415401]  [<ffffffffa00676ab>] btrfs_start_transaction+0x1b/0x20 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415408]  [<ffffffffa0071bc7>] btrfs_setsize.isra.55+0x57/0x200 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415416]  [<ffffffffa0071e42>] btrfs_setattr+0xd2/0xf0 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415418]  [<ffffffff811dc2fb>] notify_change+0x1cb/0x390
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415420]  [<ffffffff812c9ec4>] ? truncate_upper.isra.16+0x134/0x230
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415422]  [<ffffffff812ca118>] ecryptfs_setattr+0x158/0x320
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415424]  [<ffffffff811dc2fb>] notify_change+0x1cb/0x390
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415426]  [<ffffffff811be40e>] do_truncate+0x5e/0xa0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415428]  [<ffffffff811cb30b>] handle_truncate+0x6b/0xa0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415430]  [<ffffffff811d0092>] do_last+0x632/0x7c0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415431]  [<ffffffff811d02e4>] path_openat+0xc4/0x4c0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415433]  [<ffffffff811d1013>] do_filp_open+0x43/0xa0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415435]  [<ffffffff811dd90e>] ? __alloc_fd+0xce/0x120
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415438]  [<ffffffff811bf6c2>] do_sys_open+0x132/0x220
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415440]  [<ffffffff811bf7ce>] SyS_open+0x1e/0x20
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415441]  [<ffffffff81759dff>] tracesys+0xe1/0xe6
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415444] INFO: task mozStorage #2:3479 blocked for more than 120 seconds.
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415540]       Tainted: PF        C O 3.12.5-031205-generic #201312120254
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415634] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415752] mozStorage #2   D ffffffff81811d80     0  3479   2676 0x00000000
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415754]  ffff880072e8fc68 0000000000000002 0000000000000001 ffff880078a40000
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415756]  ffff880072e8ffd8 ffff880072e8ffd8 ffff880072e8ffd8 0000000000014500
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415757]  ffff88013935c710 ffff880078a40000 0000000000000001 ffff8800992ea8a8
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415762] Call Trace:
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415764]  [<ffffffff8174f189>] schedule+0x29/0x70
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415766]  [<ffffffff8174f4ae>] schedule_preempt_disabled+0xe/0x10
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415767]  [<ffffffff8174d404>] __mutex_lock_slowpath+0x114/0x1b0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415769]  [<ffffffff8174d4c3>] mutex_lock+0x23/0x40
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415772]  [<ffffffff8173c4c5>] lookup_slow+0x36/0xab
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415773]  [<ffffffff811cd7c7>] path_lookupat+0x737/0x760
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415775]  [<ffffffff811cc0a0>] ? getname_flags.part.23+0x30/0x140
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415777]  [<ffffffff811cd824>] filename_lookup+0x34/0xc0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415779]  [<ffffffff811cc216>] ? getname_flags+0x66/0x80
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415780]  [<ffffffff811d0ef9>] user_path_at_empty+0x59/0xa0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415783]  [<ffffffff813358a9>] ? aa_alloc_task_context+0x39/0x40
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415786]  [<ffffffff8133be5b>] ? apparmor_cred_prepare+0x3b/0x60
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415788]  [<ffffffff811d0f51>] user_path_at+0x11/0x20
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415790]  [<ffffffff811beb3c>] SyS_faccessat+0x9c/0x220
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415792]  [<ffffffff8102297d>] ? syscall_trace_leave+0xdd/0x150
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415794]  [<ffffffff811becd8>] SyS_access+0x18/0x20
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415796]  [<ffffffff81759dff>] tracesys+0xe1/0xe6
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415797] INFO: task DOM Worker:3492 blocked for more than 120 seconds.
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415892]       Tainted: PF        C O 3.12.5-031205-generic #201312120254
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.415986] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416104] DOM Worker      D ffffffff81811d80     0  3492   2676 0x00000000
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416106]  ffff880078aef9e8 0000000000000002 ffff8801371b21a0 ffff880136eb4800
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416108]  ffff880078aeffd8 ffff880078aeffd8 ffff880078aeffd8 0000000000014500
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416110]  ffff880139378000 ffff8801262eaf60 ffff880078aef9f8 ffff8801389890a0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416112] Call Trace:
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416113]  [<ffffffff8174f189>] schedule+0x29/0x70
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416121]  [<ffffffffa00653a1>] wait_current_trans.isra.33+0xc1/0x120 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416123]  [<ffffffff8108d380>] ? add_wait_queue+0x60/0x60
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416130]  [<ffffffffa006720e>] start_transaction.part.35+0x2ee/0x510 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416133]  [<ffffffff811d876f>] ? __d_alloc+0x5f/0x180
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416135]  [<ffffffff811d6788>] ? __d_instantiate+0x88/0x100
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416155]  [<ffffffffa0067459>] start_transaction+0x29/0x30 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416162]  [<ffffffffa00676ab>] btrfs_start_transaction+0x1b/0x20 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416170]  [<ffffffffa0075596>] btrfs_create+0x46/0x220 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416172]  [<ffffffff81300a2c>] ? security_inode_permission+0x1c/0x30
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416174]  [<ffffffff811cf81d>] vfs_create+0xed/0x160
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416176]  [<ffffffff812c98a7>] ecryptfs_do_create+0x57/0x130
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416178]  [<ffffffff812ca97b>] ecryptfs_create+0x2b/0xc0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416180]  [<ffffffff811cf81d>] vfs_create+0xed/0x160
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416181]  [<ffffffff811cf9ce>] lookup_open+0x13e/0x1d0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416184]  [<ffffffff811e0168>] ? __mnt_want_write+0x58/0x70
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416185]  [<ffffffff811cfd46>] do_last+0x2e6/0x7c0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416187]  [<ffffffff811d02e4>] path_openat+0xc4/0x4c0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416190]  [<ffffffff8115b997>] ? __free_pages+0x47/0x70
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416192]  [<ffffffff81179fcd>] ? tlb_finish_mmu+0x2d/0x40
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416194]  [<ffffffff811d1013>] do_filp_open+0x43/0xa0
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416195]  [<ffffffff811dd90e>] ? __alloc_fd+0xce/0x120
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416198]  [<ffffffff811bf6c2>] do_sys_open+0x132/0x220
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416200]  [<ffffffff8102297d>] ? syscall_trace_leave+0xdd/0x150
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416202]  [<ffffffff811bf7ce>] SyS_open+0x1e/0x20
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416204]  [<ffffffff81759dff>] tracesys+0xe1/0xe6
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416205] INFO: task mozStorage #3:3514 blocked for more than 120 seconds.
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416301]       Tainted: PF        C O 3.12.5-031205-generic #201312120254
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416395] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416514] mozStorage #3   D ffffffff81811d80     0  3514   2676 0x00000000
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416515]  ffff880078a67d28 0000000000000002 ffff880078a67cd8 ffffffffa0080bc2
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416517]  ffff880078a67fd8 ffff880078a67fd8 ffff880078a67fd8 0000000000014500
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416519]  ffffffff81c144a0 ffff880072cd2f60 ffff880078a67d38 ffff880136eb4800
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416521] Call Trace:
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416530]  [<ffffffffa0080bc2>] ? free_extent_buffer.part.41+0x32/0x90 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416532]  [<ffffffff8174f189>] schedule+0x29/0x70
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416541]  [<ffffffffa009d36c>] wait_log_commit.isra.21+0x10c/0x130 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416544]  [<ffffffff8108d380>] ? add_wait_queue+0x60/0x60
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416552]  [<ffffffffa00a2f32>] btrfs_sync_log+0x442/0x6d0 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416554]  [<ffffffff811d7510>] ? dput+0x20/0x90
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416563]  [<ffffffffa0077bfb>] btrfs_sync_file+0x27b/0x2e0 [btrfs]
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416565]  [<ffffffff811efe0b>] vfs_fsync+0x2b/0x40
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416567]  [<ffffffff812c8ddd>] ecryptfs_fsync+0x3d/0x50
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416569]  [<ffffffff811efeed>] do_fsync+0x5d/0x90
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416570]  [<ffffffff811f02d0>] SyS_fsync+0x10/0x20
Dec 16 21:39:19 Ubunto4ka kernel: [ 8158.416572]  [<ffffffff81759dff>] tracesys+0xe1/0xe6

-- 
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https://bugs.launchpad.net/bugs/1250828

Title:
  freeze on diskIO without real IO

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I have ubuntu 13.04-13.10 with kernel 3.8-3.12 (from distributive and from http://kernel.ubuntu.com/~kernel-ppa/mainline/ )
  Sometimes (in 1-3-5-... minutes) then some program use disk i has freeze it program, and if different program use disk in it time - it may freeze too. But htop and iotop show 0 diskIO at this time. Cpu-usage ~1-5%.

  Now uname -a :
  Linux Ubunto4ka 3.11.7-031107-generic #201311040853 SMP Mon Nov 4 13:54:11 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

  cat /proc/version
  Linux version 3.11.7-031107-generic (apw@gomeisa) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #201311040853 SMP Mon Nov 4 13:54:11 UTC 2013

  apt-cache policy linux-image-3.11.7-031107-generic
   *** 3.11.7-031107.201311040853
  (from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11.7-saucy/ )

  cat /proc/mounts |grep btrf
  /dev/sda1 / btrfs rw,noatime,compress=zlib,space_cache 0 0
  /dev/sda5 /data btrfs rw,noatime,compress=zlib,space_cache 0 0
  /dev/sda5 /home btrfs rw,noatime,compress=zlib,space_cache 0 0

  btrfs --version
  Btrfs v0.20-rc1

  apt-cache policy btrfs-tools
   *** 0.19+20130705-1 0
          500 http://mirror.yandex.ru/ubuntu/ saucy/main amd64 Packages

  Some logs from  dmesg -Tx :

  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972570] INFO: task okular:28758 blocked for more than 120 seconds.
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972570] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972571] okular          D 0000000000000003     0 28758   1772 0x00000000
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972573]  ffff880094b37948 0000000000000046 ffff880136f32198 ffff880137378800
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972575]  ffff880094b37fd8 ffff880094b37fd8 ffff880094b37fd8 0000000000014540
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972576]  ffff880139370000 ffff88002a814650 ffff880094b37958 ffff880138be0000
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972578] Call Trace:
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972580]  [<ffffffff8171ec99>] schedule+0x29/0x70
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972588]  [<ffffffffa006c6f1>] wait_current_trans.isra.31+0xc1/0x120 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972590]  [<ffffffff81089b00>] ? add_wait_queue+0x60/0x60
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972598]  [<ffffffffa006e53e>] start_transaction.part.33+0x2de/0x500 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972605]  [<ffffffffa006e789>] start_transaction+0x29/0x30 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972612]  [<ffffffffa006e9db>] btrfs_start_transaction+0x1b/0x20 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972620]  [<ffffffffa0079067>] btrfs_setsize.isra.56+0x57/0x1b0 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972628]  [<ffffffffa0079292>] btrfs_setattr+0xd2/0xf0 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972630]  [<ffffffff811cecb3>] notify_change+0x1d3/0x390
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972632]  [<ffffffff812b8da4>] ? truncate_upper.isra.16+0x134/0x230
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972634]  [<ffffffff812b8ff8>] ecryptfs_setattr+0x158/0x320
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972644]  [<ffffffff811cecb3>] notify_change+0x1d3/0x390
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972646]  [<ffffffff811b147e>] do_truncate+0x5e/0xa0
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972648]  [<ffffffff811be2eb>] handle_truncate+0x6b/0xa0
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972650]  [<ffffffff811c2c12>] do_last+0x5d2/0x770
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972652]  [<ffffffff811c2e74>] path_openat+0xc4/0x4f0
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972654]  [<ffffffff811c3653>] ? user_path_at_empty+0x63/0xa0
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972657]  [<ffffffff811c36f3>] do_filp_open+0x43/0xa0
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972659]  [<ffffffff811d02a5>] ? __alloc_fd+0xd5/0x160
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972661]  [<ffffffff811b26f2>] do_sys_open+0x132/0x220
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972663]  [<ffffffff811b27fe>] SyS_open+0x1e/0x20
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972664]  [<ffffffff8172951d>] system_call_fastpath+0x1a/0x1f

  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972286] INFO: task enlightenment:1720 blocked for more than 120 seconds.
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972289] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972291] enlightenment   D 0000000000000000     0  1720   1715 0x00000000
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972294]  ffff8801106679e8 0000000000000046 ffff880136f32198 ffff880137378800
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972296]  ffff880110667fd8 ffff880110667fd8 ffff880110667fd8 0000000000014540
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972298]  ffffffff81c14440 ffff880110668000 ffff8801106679f8 ffff880138be0000
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972301] Call Trace:
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972307]  [<ffffffff8171ec99>] schedule+0x29/0x70
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972328]  [<ffffffffa006c6f1>] wait_current_trans.isra.31+0xc1/0x120 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972332]  [<ffffffff81089b00>] ? add_wait_queue+0x60/0x60
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972341]  [<ffffffffa006e53e>] start_transaction.part.33+0x2de/0x500 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972349]  [<ffffffffa006e789>] start_transaction+0x29/0x30 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972357]  [<ffffffffa006e9db>] btrfs_start_transaction+0x1b/0x20 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972366]  [<ffffffffa007c936>] btrfs_create+0x46/0x220 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972369]  [<ffffffff812ef5bc>] ? security_inode_permission+0x1c/0x30
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972372]  [<ffffffff811c2405>] vfs_create+0xb5/0x120
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972374]  [<ffffffff812b8787>] ecryptfs_do_create+0x57/0x130
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972376]  [<ffffffff812b9ccb>] ecryptfs_create+0x2b/0xc0
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972378]  [<ffffffff811c2405>] vfs_create+0xb5/0x120
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972380]  [<ffffffff811c25ae>] lookup_open+0x13e/0x1d0
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972383]  [<ffffffff811bf1d8>] ? inode_permission+0x18/0x50
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972385]  [<ffffffff811d2af8>] ? __mnt_want_write+0x58/0x70
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972387]  [<ffffffff811c2947>] do_last+0x307/0x770
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972397]  [<ffffffff811c2e74>] path_openat+0xc4/0x4f0
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972399]  [<ffffffff811c36f3>] do_filp_open+0x43/0xa0
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972401]  [<ffffffff811d02a5>] ? __alloc_fd+0xd5/0x160
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972404]  [<ffffffff811b26f2>] do_sys_open+0x132/0x220
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972405]  [<ffffffff811c771e>] ? SyS_select+0xce/0x100
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972407]  [<ffffffff811b27fe>] SyS_open+0x1e/0x20
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972410]  [<ffffffff8172951d>] system_call_fastpath+0x1a/0x1f
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972417] INFO: task BrowserBlocking:3147 blocked for more than 120 seconds.
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972418] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972419] BrowserBlocking D 0000000000000000     0  3147   1720 0x00000000
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972421]  ffff880054d2fd88 0000000000000046 ffffea00010eee40 ffffea00001fb700
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972422]  ffff880054d2ffd8 ffff880054d2ffd8 ffff880054d2ffd8 0000000000014540
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972424]  ffffffff81c14440 ffff88004c6dc650 ffff880054d2fd98 ffff880138be0000
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972426] Call Trace:
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972428]  [<ffffffff8171ec99>] schedule+0x29/0x70
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972436]  [<ffffffffa006c6f1>] wait_current_trans.isra.31+0xc1/0x120 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972438]  [<ffffffff81089b00>] ? add_wait_queue+0x60/0x60
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972445]  [<ffffffffa006e53e>] start_transaction.part.33+0x2de/0x500 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972453]  [<ffffffffa0070928>] ? btrfs_writepages+0x28/0x30 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972460]  [<ffffffffa006e789>] start_transaction+0x29/0x30 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972467]  [<ffffffffa006e9db>] btrfs_start_transaction+0x1b/0x20 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972476]  [<ffffffffa007ef4d>] btrfs_sync_file+0x17d/0x2b0 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972479]  [<ffffffff811e25fb>] vfs_fsync+0x2b/0x40
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972481]  [<ffffffff812b808d>] ecryptfs_fsync+0x3d/0x50
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972482]  [<ffffffff811e26dd>] do_fsync+0x5d/0x90
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972484]  [<ffffffff811b3da0>] ? SyS_read+0x70/0xa0
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972486]  [<ffffffff811e2ae3>] SyS_fdatasync+0x13/0x20
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972488]  [<ffffffff8172951d>] system_call_fastpath+0x1a/0x1f
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972490] INFO: task BrowserBlocking:3150 blocked for more than 120 seconds.
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972490] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972491] BrowserBlocking D 0000000000000002     0  3150   1720 0x00000000
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972493]  ffff88004c375d28 0000000000000046 ffff88004c375cd8 ffffffffa0087de2
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972495]  ffff88004c375fd8 ffff88004c375fd8 ffff88004c375fd8 0000000000014540
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972496]  ffff88013935ddc0 ffff88004c655dc0 ffff88004c375d38 ffff880137378800
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972498] Call Trace:
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972507]  [<ffffffffa0087de2>] ? free_extent_buffer.part.40+0x32/0x90 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972509]  [<ffffffff8171ec99>] schedule+0x29/0x70
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972518]  [<ffffffffa00a41fc>] wait_log_commit.isra.22+0x10c/0x130 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972520]  [<ffffffff81089b00>] ? add_wait_queue+0x60/0x60
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972529]  [<ffffffffa00a9c72>] btrfs_sync_log+0x442/0x6d0 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972531]  [<ffffffff811c9e39>] ? dput+0x49/0x220
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972539]  [<ffffffffa007f055>] btrfs_sync_file+0x285/0x2b0 [btrfs]
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972541]  [<ffffffff811e25fb>] vfs_fsync+0x2b/0x40
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972543]  [<ffffffff812b808d>] ecryptfs_fsync+0x3d/0x50
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972545]  [<ffffffff811e26dd>] do_fsync+0x5d/0x90
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972546]  [<ffffffff811b3f76>] ? SyS_pwrite64+0x66/0xa0
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972548]  [<ffffffff811e2ac0>] SyS_fsync+0x10/0x20
  Nov  8 17:27:52 Ubunto4ka kernel: [177440.972550]  [<ffffffff8172951d>] system_call_fastpath+0x1a/0x1f
  --- 
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  DistroRelease: Ubuntu 13.10
  EcryptfsInUse: Yes
  MarkForUpload: True
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  Tags:  saucy
  Uname: Linux 3.11.7-031107-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dialout dip lpadmin netdev plugdev sambashare sudo

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References

[Bug 1250828] [NEW] freeze on diskIO without real IO
From: jl451, 2013-11-13