[LTP] LTP mm test fails, may be test case have some unclear problem

[LTP] LTP mm test fails, may be test case have some unclear problem

[Levi Wang]

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Hi guys,

LTP testing on RHEL-7.0 hit this issue. it's re-emerge not often.

Does anyone know this?


-----[cut here ]----

<<<test_start>>>
tag=oom01 stime=1392954542
cmdline="oom01"
contacts=""
analysis=exit
<<<test_output>>>
oom01       0  TINFO  :  set overcommit_memory to 2
oom01       0  TINFO  :  allocating 3221225472 bytes.
oom01       0  TINFO  :  allocating 3221225472 bytes.
oom01       0  TINFO  :  allocating 3221225472 bytes.
oom01       0  TINFO  :  allocating 3221225472 bytes.
oom01       0  TINFO  :  set overcommit_memory to 2
oom01       0  TINFO  :  expected victim is 31115.
oom01       0  TINFO  :  set overcommit_memory to 0
oom01       0  TINFO  :  expected victim is 31135.
oom01       1  TFAIL  :  the victim unexpectedly failed: 9
oom01       0  TINFO  :  set overcommit_memory to 1
oom01       0  TINFO  :  start normal OOM testing.
oom01       0  TINFO  :  expected victim is 31496.
oom01       0  TINFO  :  start OOM testing for mlocked pages.
oom01       0  TINFO  :  expected victim is 31514.
oom01       0  TINFO  :  start OOM testing for KSM pages.
oom01       0  TINFO  :  expected victim is 31525.
oom01       0  TINFO  :  set overcommit_memory to 0
<<<execution_status>>>


according to the console log, all of the oom01 process was killed, but
process 31115 was missing.

----[cut here ]----

[ 4611.722530] [11114]     0 11114    43018      587      87     5020
           0 beah-rhts-task
[ 4611.724547] [11144]     0 11144    28804        0      14       57
           0 runtest
[ 4611.726410] [11182]     0 11182    28867       95      14       34
           0 rhts-test-runne
[ 4611.728430] [11210]     0 11210    27045        0      12       89
           0 make
[ 4611.730235] [30217]     0 30217     2936        1      10       98
           0 runtest.sh
[ 4611.732183] [ 6237]     0  6237    70947        0      36      145
           0 rsyslogd
[ 4611.734079] [16197]     0 16197    31348        1      17       61
           0 anacron
[ 4611.735968] [  972]     0   972     3001        1      10      173
           0 runltp
[ 4611.737869] [ 1089]     0  1089     1852        4       9       29
           0 ltp-pan
[ 4611.739497] [31114]     0 31114     2152       38      10        1
           0 oom01
[ 4611.740944] [31135]     0 31135  3934312  1872550    7647  2037330
           0 oom01
[ 4611.742386] [31495]     0 31495    26973       19      11        0
           0 sleep
[ 4611.743800] Out of memory: Kill process 31135 (oom01) score 932 or
sacrifice child
[ 4611.745158] Killed process 31135 (oom01) total-vm:15737248kB,
anon-rss:7490200kB, file-rss:0kB
[ 4682.545284] oom01 invoked oom-killer: gfp_mask=0x280da, order=0,
oom_score_adj=0

-- 
Regards，
Levi Wang
Email: wangli5665@gmail.com

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Re: [LTP] LTP mm test fails, may be test case have some unclear problem

[chrubis]

Hi!
> LTP testing on RHEL-7.0 hit this issue. it's re-emerge not often.
> 
> Does anyone know this?
> 
> -----[cut here ]----
> 
> <<<test_start>>>
> tag=oom01 stime=1392954542
> cmdline="oom01"
> contacts=""
> analysis=exit
> <<<test_output>>>
> oom01       0  TINFO  :  set overcommit_memory to 2
> oom01       0  TINFO  :  allocating 3221225472 bytes.
> oom01       0  TINFO  :  allocating 3221225472 bytes.
> oom01       0  TINFO  :  allocating 3221225472 bytes.
> oom01       0  TINFO  :  allocating 3221225472 bytes.
> oom01       0  TINFO  :  set overcommit_memory to 2
> oom01       0  TINFO  :  expected victim is 31115.
> oom01       0  TINFO  :  set overcommit_memory to 0
> oom01       0  TINFO  :  expected victim is 31135.
> oom01       1  TFAIL  :  the victim unexpectedly failed: 9
> oom01       0  TINFO  :  set overcommit_memory to 1
> oom01       0  TINFO  :  start normal OOM testing.
> oom01       0  TINFO  :  expected victim is 31496.
> oom01       0  TINFO  :  start OOM testing for mlocked pages.
> oom01       0  TINFO  :  expected victim is 31514.
> oom01       0  TINFO  :  start OOM testing for KSM pages.
> oom01       0  TINFO  :  expected victim is 31525.
> oom01       0  TINFO  :  set overcommit_memory to 0
> <<<execution_status>>>

Hmm, the test does not expect to have it's children killed while the
child mmaps and dirties more and more memory. So it seems to be test
that asserts that mmap() returns failure before the test is killed with
oom although the documentation in the test source code says that the
test increases memory consumption untill OOM is triggered.

Anyway there seems to be something wrong with the test. I would say that
there is no guarantee that mmap() will fail before OOM tries to kill the
process if overcommit is set to 0 or 1.

-- 
Cyril Hrubis
chrubis@suse.cz

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