Hello Joseph,

the last kernel, you have prepared for testing contains this bug.

I've just noticed that 3.13.0-031300rc3-generic kernel contains the bug the bug as well, so the bisect went in the wrong direction. Sorry for this. I'll have a deeper look inside, hoping to understand why the bug didn't appear during the first testing.   

[44094.835704] md: data-check of RAID array md1
[44094.835716] md: minimum _guaranteed_  speed: 1000 KB/sec/disk.
[44094.835723] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check.
[44094.835732] md: using 128k window, over a total of 4192192k.
[44095.909810] type=1400 audit(1411015241.514:35): apparmor="STATUS" operation="profile_replace" name="/usr/lib/cups/backend/cups-pdf" pid=8865 comm="apparmor_parser"
[44095.909839] type=1400 audit(1411015241.514:36): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/cupsd" pid=8865 comm="apparmor_parser"
[44095.912967] type=1400 audit(1411015241.518:37): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/cupsd" pid=8865 comm="apparmor_parser"
[44403.916160] INFO: task md1_resync:8767 blocked for more than 120 seconds.
[44403.916448]       Not tainted 3.13.0-031300rc3-generic #201312061335
[44403.916692] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[44403.916988] md1_resync      D c10a8e24     0  8767      2 0x00000000
[44403.917009]  ebc1bd5c 00000046 ebc1bce8 c10a8e24 00000092 20e0b127 00002833 c1af0400
[44403.917039]  c105bbd2 c1af0400 f7bde400 e794b400 f7210d00 00000000 f6a8be48 ebc1bd1c
[44403.917066]  ebc1bd30 f6a8be00 f6a8be48 ebc1bd70 ebc1bd90 c16998b3 00000082 e794b400
[44403.917093] Call Trace:
[44403.917122]  [<c10a8e24>] ? irq_to_desc+0x14/0x20
[44403.917141]  [<c105bbd2>] ? irq_exit+0x62/0xa0
[44403.917162]  [<c16998b3>] ? common_interrupt+0x33/0x38
[44403.917178]  [<c1093f31>] ? prepare_to_wait_event+0x71/0xd0
[44403.917195]  [<c168e733>] schedule+0x23/0x60
[44403.917247]  [<f8444e45>] raise_barrier+0x125/0x1c0 [raid1]
[44403.917263]  [<c1094010>] ? __wake_up_sync+0x20/0x20
[44403.917291]  [<f8444fab>] sync_request+0xcb/0xad0 [raid1]
[44403.917312]  [<c1534b9f>] md_do_sync+0x9bf/0x1000
[44403.917341]  [<f8444ee0>] ? raise_barrier+0x1c0/0x1c0 [raid1]
[44403.917361]  [<c10653d7>] ? recalc_sigpending+0x17/0x50
[44403.917379]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[44403.917395]  [<c1531e84>] md_thread+0xe4/0x110
[44403.917409]  [<c1093adf>] ? __wake_up_locked+0x1f/0x30
[44403.917426]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[44403.917441]  [<c107625b>] kthread+0x9b/0xb0
[44403.917459]  [<c1699337>] ret_from_kernel_thread+0x1b/0x28
[44403.917474]  [<c10761c0>] ? flush_kthread_worker+0x90/0x90
[44523.916155] INFO: task md1_resync:8767 blocked for more than 120 seconds.
[44523.916433]       Not tainted 3.13.0-031300rc3-generic #201312061335
[44523.916676] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[44523.916972] md1_resync      D c10a8e24     0  8767      2 0x00000000
[44523.916993]  ebc1bd5c 00000046 ebc1bce8 c10a8e24 00000092 20e0b127 00002833 c1af0400
[44523.917022]  c105bbd2 c1af0400 f7bde400 e794b400 f7210d00 00000000 f6a8be48 ebc1bd1c
[44523.917049]  ebc1bd30 f6a8be00 f6a8be48 ebc1bd70 ebc1bd90 c16998b3 00000082 e794b400
[44523.917077] Call Trace:
[44523.917106]  [<c10a8e24>] ? irq_to_desc+0x14/0x20
[44523.917125]  [<c105bbd2>] ? irq_exit+0x62/0xa0
[44523.917145]  [<c16998b3>] ? common_interrupt+0x33/0x38
[44523.917162]  [<c1093f31>] ? prepare_to_wait_event+0x71/0xd0
[44523.917179]  [<c168e733>] schedule+0x23/0x60
[44523.917232]  [<f8444e45>] raise_barrier+0x125/0x1c0 [raid1]
[44523.917248]  [<c1094010>] ? __wake_up_sync+0x20/0x20
[44523.917276]  [<f8444fab>] sync_request+0xcb/0xad0 [raid1]
[44523.917296]  [<c1534b9f>] md_do_sync+0x9bf/0x1000
[44523.917325]  [<f8444ee0>] ? raise_barrier+0x1c0/0x1c0 [raid1]
[44523.917345]  [<c10653d7>] ? recalc_sigpending+0x17/0x50
[44523.917363]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[44523.917379]  [<c1531e84>] md_thread+0xe4/0x110
[44523.917393]  [<c1093adf>] ? __wake_up_locked+0x1f/0x30
[44523.917410]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[44523.917425]  [<c107625b>] kthread+0x9b/0xb0
[44523.917443]  [<c1699337>] ret_from_kernel_thread+0x1b/0x28
[44523.917458]  [<c10761c0>] ? flush_kthread_worker+0x90/0x90
[44643.916158] INFO: task md1_resync:8767 blocked for more than 120 seconds.
[44643.916436]       Not tainted 3.13.0-031300rc3-generic #201312061335
[44643.916679] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[44643.916975] md1_resync      D c10a8e24     0  8767      2 0x00000000
[44643.916996]  ebc1bd5c 00000046 ebc1bce8 c10a8e24 00000092 20e0b127 00002833 c1af0400
[44643.917026]  c105bbd2 c1af0400 f7bde400 e794b400 f7210d00 00000000 f6a8be48 ebc1bd1c
[44643.917052]  ebc1bd30 f6a8be00 f6a8be48 ebc1bd70 ebc1bd90 c16998b3 00000082 e794b400
[44643.917080] Call Trace:
[44643.917109]  [<c10a8e24>] ? irq_to_desc+0x14/0x20
[44643.917128]  [<c105bbd2>] ? irq_exit+0x62/0xa0
[44643.917149]  [<c16998b3>] ? common_interrupt+0x33/0x38
[44643.917166]  [<c1093f31>] ? prepare_to_wait_event+0x71/0xd0
[44643.917183]  [<c168e733>] schedule+0x23/0x60
[44643.917236]  [<f8444e45>] raise_barrier+0x125/0x1c0 [raid1]
[44643.917252]  [<c1094010>] ? __wake_up_sync+0x20/0x20
[44643.917280]  [<f8444fab>] sync_request+0xcb/0xad0 [raid1]
[44643.917300]  [<c1534b9f>] md_do_sync+0x9bf/0x1000
[44643.917329]  [<f8444ee0>] ? raise_barrier+0x1c0/0x1c0 [raid1]
[44643.917350]  [<c10653d7>] ? recalc_sigpending+0x17/0x50
[44643.917367]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[44643.917383]  [<c1531e84>] md_thread+0xe4/0x110
[44643.917398]  [<c1093adf>] ? __wake_up_locked+0x1f/0x30
[44643.917414]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[44643.917430]  [<c107625b>] kthread+0x9b/0xb0
[44643.917447]  [<c1699337>] ret_from_kernel_thread+0x1b/0x28
[44643.917462]  [<c10761c0>] ? flush_kthread_worker+0x90/0x90
[44763.916147] INFO: task md1_resync:8767 blocked for more than 120 seconds.
[44763.916424]       Not tainted 3.13.0-031300rc3-generic #201312061335
[44763.916668] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[44763.916964] md1_resync      D c10a8e24     0  8767      2 0x00000000
[44763.916985]  ebc1bd5c 00000046 ebc1bce8 c10a8e24 00000092 20e0b127 00002833 c1af0400
[44763.917014]  c105bbd2 c1af0400 f7bde400 e794b400 f7210d00 00000000 f6a8be48 ebc1bd1c
[44763.917041]  ebc1bd30 f6a8be00 f6a8be48 ebc1bd70 ebc1bd90 c16998b3 00000082 e794b400
[44763.917069] Call Trace:
[44763.917098]  [<c10a8e24>] ? irq_to_desc+0x14/0x20
[44763.917117]  [<c105bbd2>] ? irq_exit+0x62/0xa0
[44763.917137]  [<c16998b3>] ? common_interrupt+0x33/0x38
[44763.917154]  [<c1093f31>] ? prepare_to_wait_event+0x71/0xd0
[44763.917171]  [<c168e733>] schedule+0x23/0x60
[44763.917224]  [<f8444e45>] raise_barrier+0x125/0x1c0 [raid1]
[44763.917240]  [<c1094010>] ? __wake_up_sync+0x20/0x20
[44763.917268]  [<f8444fab>] sync_request+0xcb/0xad0 [raid1]
[44763.917288]  [<c1534b9f>] md_do_sync+0x9bf/0x1000
[44763.917317]  [<f8444ee0>] ? raise_barrier+0x1c0/0x1c0 [raid1]
[44763.917338]  [<c10653d7>] ? recalc_sigpending+0x17/0x50
[44763.917356]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[44763.917371]  [<c1531e84>] md_thread+0xe4/0x110
[44763.917386]  [<c1093adf>] ? __wake_up_locked+0x1f/0x30
[44763.917402]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[44763.917418]  [<c107625b>] kthread+0x9b/0xb0
[44763.917435]  [<c1699337>] ret_from_kernel_thread+0x1b/0x28
[44763.917451]  [<c10761c0>] ? flush_kthread_worker+0x90/0x90
[44883.916180] INFO: task md1_resync:8767 blocked for more than 120 seconds.
[44883.916457]       Not tainted 3.13.0-031300rc3-generic #201312061335
[44883.916701] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[44883.916996] md1_resync      D c10a8e24     0  8767      2 0x00000000
[44883.917017]  ebc1bd5c 00000046 ebc1bce8 c10a8e24 00000092 20e0b127 00002833 c1af0400
[44883.917047]  c105bbd2 c1af0400 f7bde400 e794b400 f7210d00 00000000 f6a8be48 ebc1bd1c
[44883.917074]  ebc1bd30 f6a8be00 f6a8be48 ebc1bd70 ebc1bd90 c16998b3 00000082 e794b400
[44883.917101] Call Trace:
[44883.917130]  [<c10a8e24>] ? irq_to_desc+0x14/0x20
[44883.917150]  [<c105bbd2>] ? irq_exit+0x62/0xa0
[44883.917170]  [<c16998b3>] ? common_interrupt+0x33/0x38
[44883.917187]  [<c1093f31>] ? prepare_to_wait_event+0x71/0xd0
[44883.917204]  [<c168e733>] schedule+0x23/0x60
[44883.917257]  [<f8444e45>] raise_barrier+0x125/0x1c0 [raid1]
[44883.917273]  [<c1094010>] ? __wake_up_sync+0x20/0x20
[44883.917301]  [<f8444fab>] sync_request+0xcb/0xad0 [raid1]
[44883.917321]  [<c1534b9f>] md_do_sync+0x9bf/0x1000
[44883.917350]  [<f8444ee0>] ? raise_barrier+0x1c0/0x1c0 [raid1]
[44883.917371]  [<c10653d7>] ? recalc_sigpending+0x17/0x50
[44883.917388]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[44883.917404]  [<c1531e84>] md_thread+0xe4/0x110
[44883.917419]  [<c1093adf>] ? __wake_up_locked+0x1f/0x30
[44883.917435]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[44883.917450]  [<c107625b>] kthread+0x9b/0xb0
[44883.917468]  [<c1699337>] ret_from_kernel_thread+0x1b/0x28
[44883.917483]  [<c10761c0>] ? flush_kthread_worker+0x90/0x90
[45003.916166] INFO: task md1_resync:8767 blocked for more than 120 seconds.
[45003.916445]       Not tainted 3.13.0-031300rc3-generic #201312061335
[45003.916688] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[45003.916984] md1_resync      D c10a8e24     0  8767      2 0x00000000
[45003.917005]  ebc1bd5c 00000046 ebc1bce8 c10a8e24 00000092 20e0b127 00002833 c1af0400
[45003.917035]  c105bbd2 c1af0400 f7bde400 e794b400 f7210d00 00000000 f6a8be48 ebc1bd1c
[45003.917062]  ebc1bd30 f6a8be00 f6a8be48 ebc1bd70 ebc1bd90 c16998b3 00000082 e794b400
[45003.917089] Call Trace:
[45003.917118]  [<c10a8e24>] ? irq_to_desc+0x14/0x20
[45003.917137]  [<c105bbd2>] ? irq_exit+0x62/0xa0
[45003.917157]  [<c16998b3>] ? common_interrupt+0x33/0x38
[45003.917174]  [<c1093f31>] ? prepare_to_wait_event+0x71/0xd0
[45003.917191]  [<c168e733>] schedule+0x23/0x60
[45003.917244]  [<f8444e45>] raise_barrier+0x125/0x1c0 [raid1]
[45003.917260]  [<c1094010>] ? __wake_up_sync+0x20/0x20
[45003.917288]  [<f8444fab>] sync_request+0xcb/0xad0 [raid1]
[45003.917308]  [<c1534b9f>] md_do_sync+0x9bf/0x1000
[45003.917337]  [<f8444ee0>] ? raise_barrier+0x1c0/0x1c0 [raid1]
[45003.917357]  [<c10653d7>] ? recalc_sigpending+0x17/0x50
[45003.917375]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[45003.917391]  [<c1531e84>] md_thread+0xe4/0x110
[45003.917405]  [<c1093adf>] ? __wake_up_locked+0x1f/0x30
[45003.917422]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[45003.917437]  [<c107625b>] kthread+0x9b/0xb0
[45003.917455]  [<c1699337>] ret_from_kernel_thread+0x1b/0x28
[45003.917470]  [<c10761c0>] ? flush_kthread_worker+0x90/0x90
[45123.916164] INFO: task md1_resync:8767 blocked for more than 120 seconds.
[45123.916443]       Not tainted 3.13.0-031300rc3-generic #201312061335
[45123.916687] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[45123.916983] md1_resync      D c10a8e24     0  8767      2 0x00000000
[45123.917004]  ebc1bd5c 00000046 ebc1bce8 c10a8e24 00000092 20e0b127 00002833 c1af0400
[45123.917033]  c105bbd2 c1af0400 f7bde400 e794b400 f7210d00 00000000 f6a8be48 ebc1bd1c
[45123.917060]  ebc1bd30 f6a8be00 f6a8be48 ebc1bd70 ebc1bd90 c16998b3 00000082 e794b400
[45123.917087] Call Trace:
[45123.917116]  [<c10a8e24>] ? irq_to_desc+0x14/0x20
[45123.917136]  [<c105bbd2>] ? irq_exit+0x62/0xa0
[45123.917156]  [<c16998b3>] ? common_interrupt+0x33/0x38
[45123.917173]  [<c1093f31>] ? prepare_to_wait_event+0x71/0xd0
[45123.917190]  [<c168e733>] schedule+0x23/0x60
[45123.917242]  [<f8444e45>] raise_barrier+0x125/0x1c0 [raid1]
[45123.917258]  [<c1094010>] ? __wake_up_sync+0x20/0x20
[45123.917286]  [<f8444fab>] sync_request+0xcb/0xad0 [raid1]
[45123.917306]  [<c1534b9f>] md_do_sync+0x9bf/0x1000
[45123.917335]  [<f8444ee0>] ? raise_barrier+0x1c0/0x1c0 [raid1]
[45123.917356]  [<c10653d7>] ? recalc_sigpending+0x17/0x50
[45123.917373]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[45123.917389]  [<c1531e84>] md_thread+0xe4/0x110
[45123.917404]  [<c1093adf>] ? __wake_up_locked+0x1f/0x30
[45123.917420]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[45123.917435]  [<c107625b>] kthread+0x9b/0xb0
[45123.917453]  [<c1699337>] ret_from_kernel_thread+0x1b/0x28
[45123.917468]  [<c10761c0>] ? flush_kthread_worker+0x90/0x90
[45243.916159] INFO: task md1_resync:8767 blocked for more than 120 seconds.
[45243.916438]       Not tainted 3.13.0-031300rc3-generic #201312061335
[45243.916682] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[45243.916978] md1_resync      D c10a8e24     0  8767      2 0x00000000
[45243.916998]  ebc1bd5c 00000046 ebc1bce8 c10a8e24 00000092 20e0b127 00002833 c1af0400
[45243.917028]  c105bbd2 c1af0400 f7bde400 e794b400 f7210d00 00000000 f6a8be48 ebc1bd1c
[45243.917055]  ebc1bd30 f6a8be00 f6a8be48 ebc1bd70 ebc1bd90 c16998b3 00000082 e794b400
[45243.917082] Call Trace:
[45243.917111]  [<c10a8e24>] ? irq_to_desc+0x14/0x20
[45243.917130]  [<c105bbd2>] ? irq_exit+0x62/0xa0
[45243.917151]  [<c16998b3>] ? common_interrupt+0x33/0x38
[45243.917168]  [<c1093f31>] ? prepare_to_wait_event+0x71/0xd0
[45243.917185]  [<c168e733>] schedule+0x23/0x60
[45243.917237]  [<f8444e45>] raise_barrier+0x125/0x1c0 [raid1]
[45243.917253]  [<c1094010>] ? __wake_up_sync+0x20/0x20
[45243.917281]  [<f8444fab>] sync_request+0xcb/0xad0 [raid1]
[45243.917301]  [<c1534b9f>] md_do_sync+0x9bf/0x1000
[45243.917330]  [<f8444ee0>] ? raise_barrier+0x1c0/0x1c0 [raid1]
[45243.917351]  [<c10653d7>] ? recalc_sigpending+0x17/0x50
[45243.917368]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[45243.917384]  [<c1531e84>] md_thread+0xe4/0x110
[45243.917399]  [<c1093adf>] ? __wake_up_locked+0x1f/0x30
[45243.917415]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[45243.917431]  [<c107625b>] kthread+0x9b/0xb0
[45243.917448]  [<c1699337>] ret_from_kernel_thread+0x1b/0x28
[45243.917463]  [<c10761c0>] ? flush_kthread_worker+0x90/0x90
[45363.916158] INFO: task md1_resync:8767 blocked for more than 120 seconds.
[45363.916436]       Not tainted 3.13.0-031300rc3-generic #201312061335
[45363.916679] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[45363.916975] md1_resync      D c10a8e24     0  8767      2 0x00000000
[45363.916996]  ebc1bd5c 00000046 ebc1bce8 c10a8e24 00000092 20e0b127 00002833 c1af0400
[45363.917025]  c105bbd2 c1af0400 f7bde400 e794b400 f7210d00 00000000 f6a8be48 ebc1bd1c
[45363.917052]  ebc1bd30 f6a8be00 f6a8be48 ebc1bd70 ebc1bd90 c16998b3 00000082 e794b400
[45363.917079] Call Trace:
[45363.917108]  [<c10a8e24>] ? irq_to_desc+0x14/0x20
[45363.917127]  [<c105bbd2>] ? irq_exit+0x62/0xa0
[45363.917148]  [<c16998b3>] ? common_interrupt+0x33/0x38
[45363.917165]  [<c1093f31>] ? prepare_to_wait_event+0x71/0xd0
[45363.917181]  [<c168e733>] schedule+0x23/0x60
[45363.917234]  [<f8444e45>] raise_barrier+0x125/0x1c0 [raid1]
[45363.917250]  [<c1094010>] ? __wake_up_sync+0x20/0x20
[45363.917278]  [<f8444fab>] sync_request+0xcb/0xad0 [raid1]
[45363.917298]  [<c1534b9f>] md_do_sync+0x9bf/0x1000
[45363.917327]  [<f8444ee0>] ? raise_barrier+0x1c0/0x1c0 [raid1]
[45363.917348]  [<c10653d7>] ? recalc_sigpending+0x17/0x50
[45363.917366]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[45363.917381]  [<c1531e84>] md_thread+0xe4/0x110
[45363.917396]  [<c1093adf>] ? __wake_up_locked+0x1f/0x30
[45363.917412]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[45363.917428]  [<c107625b>] kthread+0x9b/0xb0
[45363.917446]  [<c1699337>] ret_from_kernel_thread+0x1b/0x28
[45363.917461]  [<c10761c0>] ? flush_kthread_worker+0x90/0x90
[45483.916159] INFO: task md1_resync:8767 blocked for more than 120 seconds.
[45483.916436]       Not tainted 3.13.0-031300rc3-generic #201312061335
[45483.916679] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[45483.916975] md1_resync      D c10a8e24     0  8767      2 0x00000000
[45483.916996]  ebc1bd5c 00000046 ebc1bce8 c10a8e24 00000092 20e0b127 00002833 c1af0400
[45483.917025]  c105bbd2 c1af0400 f7bde400 e794b400 f7210d00 00000000 f6a8be48 ebc1bd1c
[45483.917052]  ebc1bd30 f6a8be00 f6a8be48 ebc1bd70 ebc1bd90 c16998b3 00000082 e794b400
[45483.917080] Call Trace:
[45483.917109]  [<c10a8e24>] ? irq_to_desc+0x14/0x20
[45483.917128]  [<c105bbd2>] ? irq_exit+0x62/0xa0
[45483.917148]  [<c16998b3>] ? common_interrupt+0x33/0x38
[45483.917165]  [<c1093f31>] ? prepare_to_wait_event+0x71/0xd0
[45483.917182]  [<c168e733>] schedule+0x23/0x60
[45483.917236]  [<f8444e45>] raise_barrier+0x125/0x1c0 [raid1]
[45483.917251]  [<c1094010>] ? __wake_up_sync+0x20/0x20
[45483.917279]  [<f8444fab>] sync_request+0xcb/0xad0 [raid1]
[45483.917300]  [<c1534b9f>] md_do_sync+0x9bf/0x1000
[45483.917329]  [<f8444ee0>] ? raise_barrier+0x1c0/0x1c0 [raid1]
[45483.917349]  [<c10653d7>] ? recalc_sigpending+0x17/0x50
[45483.917367]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[45483.917383]  [<c1531e84>] md_thread+0xe4/0x110
[45483.917397]  [<c1093adf>] ? __wake_up_locked+0x1f/0x30
[45483.917414]  [<c1531da0>] ? md_rdev_init+0x100/0x100
[45483.917429]  [<c107625b>] kthread+0x9b/0xb0
[45483.917447]  [<c1699337>] ret_from_kernel_thread+0x1b/0x28
[45483.917462]  [<c10761c0>] ? flush_kthread_worker+0x90/0x90