Re: [LTP] fork13 failure on RHEL 6.0

[Caspar Zhang <czhang@redhat.com>]

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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