[LTP] fork13 failure on RHEL 6.0

[LTP] fork13 failure on RHEL 6.0

[Sandip Bhattacharya]

I am getting repeated failures on RHEL 6.0 for the fork13 test. Has
anybody else run this test on RHEL 6? This is with the latest patch for
fork13.c incorporated into the source.

Here is the output that I am getting. The "wait return value" error is
intermittent.

    <<<test_start>>>
    tag=fork13 stime=1306261161
    cmdline="fork13 -c 2 -i 1000000"
    contacts=""
    analysis=exit
    <<<test_output>>>
    fork13      1  TFAIL  :  Unexpected pid sequence: previous fork: pid=14676, current fork: pid=14676 for iteration=75939.
    fork13      1  TFAIL  :  Wait return value: expected pid=14678, got 21800, iteration 78525.
    incrementing stop
    <<<execution_status>>>
    initiation_status="ok"
    duration=13 termination_type=exited termination_id=1 corefile=no
    cutime=258 cstime=2550
    <<<test_end>>>

I understand that this is a test to check a pid reuse race condition. So
if this test fails, is it very naive to assume that the kernel doesn't have the
patch which fixes this issue? [1] Or could there be a problem with the
test itself?

[1] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5fdee8c4a5e1800489ce61963208f8cc55e42ea1

Thanks,
  Sandip


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Re: [LTP] fork13 failure on RHEL 6.0

[Caspar Zhang]

On 05/25/2011 02:30 AM, Sandip Bhattacharya wrote:
> I am getting repeated failures on RHEL 6.0 for the fork13 test. Has
> anybody else run this test on RHEL 6? This is with the latest patch for
> fork13.c incorporated into the source.
> 
> Here is the output that I am getting. The "wait return value" error is
> intermittent.
> 
>     <<<test_start>>>
>     tag=fork13 stime=1306261161
>     cmdline="fork13 -c 2 -i 1000000"
>     contacts=""
>     analysis=exit
>     <<<test_output>>>
>     fork13      1  TFAIL  :  Unexpected pid sequence: previous fork: pid=14676, current fork: pid=14676 for iteration=75939.
>     fork13      1  TFAIL  :  Wait return value: expected pid=14678, got 21800, iteration 78525.
>     incrementing stop
>     <<<execution_status>>>
>     initiation_status="ok"
>     duration=13 termination_type=exited termination_id=1 corefile=no
>     cutime=258 cstime=2550
>     <<<test_end>>>
> 
> I understand that this is a test to check a pid reuse race condition. So
> if this test fails, is it very naive to assume that the kernel doesn't have the
> patch which fixes this issue? [1] Or could there be a problem with the
> test itself?
> 
> [1] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5fdee8c4a5e1800489ce61963208f8cc55e42ea1

Hi, the above commit was not included in RHEL6.0 kernel, which caused
the test producing TFAIL. The test itself was OK.

Thanks,
Caspar

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