[LINUX-KERNEL] Kernel hung for more than 120 seconds due to tee process

Hi,

In debian wheezy system while writing logs to SSD using tee command , we are experiencing kernel hung problem.

Can anyone help in avoiding this problem ?

I haven't subscribed to kernel mailing list,so re-ponders please CC me in the reply.

Kernel trace :

kernel: [ 960.964830] INFO: task tee:11324 blocked for more than 120 seconds.

kernel: [ 960.966422] Tainted: G O 3.16.0-4-586 #1

kernel: [ 960.967996] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

kernel: [ 960.969607] tee D ffff8803e29a5788 0 11324 1 0x00000000

kernel: [ 960.969614] ffffffff818184a0 0000000000000086 0000000000012ec0 ffff8803e29a5330

kernel: [ 960.969628] 0000000000012ec0 ffff8803e2cdbfd8 0000000000012ec0 ffff8803e29a5330

kernel: [ 960.969632] ffff88040aef2800 ffff88040b317828 fffffffe00000002 ffff8803e29a5330

kernel: [ 960.969640] Call Trace:

kernel: [ 960.969654] [<ffffffff8158259a>] ? schedule_timeout+0x20a/0x270

kernel: [ 960.969659] [<ffffffff811c28ce>] ? pipe_read+0x23e/0x2f0

kernel: [ 960.969665] [<ffffffff81585f09>] ? ldsem_down_read+0x119/0x210

kernel: [ 960.969671] [<ffffffff813cc02c>] ? tty_ldisc_ref_wait+0x1c/0x40

kernel: [ 960.969674] [<ffffffff813c3ccc>] ? tty_write+0x7c/0x2b0

kernel: [ 960.969678] [<ffffffff81286d9f>] ? security_file_permission+0x2f/0xd0

kernel: [ 960.969681] [<ffffffff813c3f3a>] ? redirected_tty_write+0x3a/0xd0

kernel: [ 960.969685] [<ffffffff811ba6af>] ? vfs_write+0xbf/0x200

kernel: [ 960.969688] [<ffffffff811bac00>] ? SyS_write+0x50/0xb0

kernel: [ 960.969693] [<ffffffff81586b0d>] ? system_call_fastpath+0x1a/0x1f

SystemInfo

$> uname -a

Linux ACPU2 3.16.0-4-586 #1 SMP Tue Oct 13 13:56:57 CDT 2015 x86_64 GNU/Linux

$> free -m

total used free shared buffers cached

Mem: 15866 7233 8633 0 73 3103

-/+ buffers/cache: 4056 11809

Swap: 32772 0 32772

$> lscpu

Architecture: x86_64

CPU op-mode(s): 32-bit, 64-bit

Byte Order: Little Endian

CPU(s): 8

On-line CPU(s) list: 0-7

Thread(s) per core: 2

Core(s) per socket: 4

Socket(s): 1

NUMA node(s): 1

Vendor ID: GenuineIntel

CPU family: 6

Model: 58

Stepping: 9

CPU MHz: 1203.644

BogoMIPS: 4200.03

Virtualization: VT-x

L1d cache: 32K

L1i cache: 32K

L2 cache: 256K

L3 cache: 6144K

NUMA node0 CPU(s): 0-7

Thanks,

Rajesh Natarajan.