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.
