benchmark test failed in few cases for timeout problem

workbench automation tool failing few cases for timeout problem. I have noticed this problem 1 out of 10 one of those cases are

[ 5.281198] sda: sda1 sda2 sda3 sda4 < sda5 sda6 >
[ 5.299353] sd 0:0:0:0: [sda] No Caching mode page present
[ 5.315807] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 5.334073] sd 0:0:0:0: [sda] Attached SCSI removable disk
[ 5.376638] EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts: (null)
[ 6.631245] EXT4-fs (sda3): recovery complete
[ 6.647577] EXT4-fs (sda3): mounted filesystem with ordered data mode. Opts: nomblk_io_submit,errors=panic
[ 14.355393] EXT4-fs (sda5): recovery complete
[ 14.373135] EXT4-fs (sda5): mounted filesystem with ordered data mode. Opts: nomblk_io_submit,errors=panic
[ 14.434610] lowmem_shrink: convert oom_adj to oom_score_adj:
[ 14.451584] oom_adj 0 => oom_score_adj 0
[ 14.463325] oom_adj 1 => oom_score_adj 58
[ 14.475334] oom_adj 2 => oom_score_adj 117
[ 14.487597] oom_adj 4 => oom_score_adj 235
[ 14.499856] oom_adj 7 => oom_score_adj 411
[ 14.512123] oom_adj 15 => oom_score_adj 1000
[ 14.666467] gator: version magic '3.8.0-rc4-00666-g9286af1 SMP mod_unload ARMv7 p2v8 ' should be '3.7.0-00655-g8cc8c22 SMP mod_unload ARMv7 p2v8 '
[�[ 14.716813] init: cannot find '/system/etc/install-recovery.sh', disabling 'flash_recovery'
root@android:/ # input keyevent 82
[ 15.172142] smsc911x 1a000000.ethernet eth0: SMSC911x/921x identified at 0xf00e0000, IRQ: 47
[ 23.636728] warning: `zygote' uses 32-bit capabilities (legacy support in use)
[ 33.282966] lowmem_shrink: convert oom_adj to oom_score_adj:
[ 33.299960] oom_adj 0 => oom_score_adj 0
[ 33.311719] oom_adj 1 => oom_score_adj 58
[ 33.323718] oom_adj 2 => oom_score_adj 117
[ 33.335976] oom_adj 4 => oom_score_adj 235
[ 33.348234] oom_adj 9 => oom_score_adj 529
[ 33.360492] oom_adj 15 => oom_score_adj 1000
[ 45.396454] init: sys_prop: permission denied uid:1003 name:service.bootanim.exit
Unexpected error: <class 'pexpect.TIMEOUT'>
Unexpected error: <class 'pexpect.TIMEOUT'>
------------------------------------------------------------
Traceback (most recent call last):
  File "workload.py", line 489, in workload_run
    tc2_boot(osmode)
  File "/home/naresh/benchmarks/viresh/jan-31/workload-automation/tc2_boot.py", line 277, in tc2_boot
    target.expect(config_android_prompt)
  File "/usr/lib/python2.7/dist-packages/pexpect.py", line 1311, in expect
    return self.expect_list(compiled_pattern_list, timeout, searchwindowsize)
  File "/usr/lib/python2.7/dist-packages/pexpect.py", line 1325, in expect_list
    return self.expect_loop(searcher_re(pattern_list), timeout, searchwindowsize)
  File "/usr/lib/python2.7/dist-packages/pexpect.py", line 1409, in expect_loop
    raise TIMEOUT (str(e) + '\n' + str(self))
TIMEOUT: Timeout exceeded in read_nonblocking().
<fdpexpect.fdspawn object at 0x2263d50>
version: 2.3 ($Revision: 399 $)
command: None
args: None
searcher: searcher_re:
    0: re.compile("^.*root@android:/ # ")
buffer (last 100 chars): re_adj 1000
[ 45.396454] init: sys_prop: permission denied uid:1003 name:service.bootanim.exit

before (last 100 chars): re_adj 1000
[ 45.396454] init: sys_prop: permission denied uid:1003 name:service.bootanim.exit

after: <class 'pexpect.TIMEOUT'>
match: None
match_index: None
exitstatus: None
flag_eof: False
pid: None
child_fd: 102
closed: False
timeout: 600
delimiter: <class 'pexpect.EOF'>
logfile: <open file '<stdout>', mode 'w' at 0x7f42b1dac1e0>
logfile_read: None
logfile_send: None
maxread: 2000
ignorecase: False
searchwindowsize: None
delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1
------------------------------------------------------------

once after shell come up, python scripts expects below line.
if it is not found it will wait 1200 sec and report timeout error and restart the target.
root@android:/ #