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

[chrubis@suse.cz]

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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