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

[Rajesh Natarajan]

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.


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