Re: [LTP] [PATCH] pthread_detach/4-3: workaround for segment fault

[Kang Kai <Kai.Kang@windriver.com>]

On 2012年08月22日 22:20, Jan Stancek wrote:
> On 08/22/2012 10:58 AM, Jan Stancek wrote:
>>
>> ----- Original Message -----
>>> From: "Kang Kai"<Kai.Kang@windriver.com>
>>> To: "Jan Stancek"<jstancek@redhat.com>
>>> Cc: gaowanlong@cn.fujitsu.com, ltp-list@lists.sourceforge.net, "Zhenfeng Zhao"<Zhenfeng.Zhao@windriver.com>
>>> Sent: Wednesday, 22 August, 2012 10:28:59 AM
>>> Subject: Re: [LTP] [PATCH] pthread_detach/4-3: workaround for segment fault
>>> Hi Jan,
>>>
>>>> Is the above output from mips or x86_64?
>>>> Are you running it as root user?
>>> This was tested on x86_64 with unprivileged  user. I retest it with
>>> root
>>> and test passes.
>> Your unprivileged user is hitting some resource limit, I'd be interested
>> to see how many threads are actually running at the same time.
>>
>>> It passes on routerstation(mips) with your patch too.
>>> So it looks like a race condition issue about stack attribute between
>>> threads, right?
>> I think so. We can try different way of signalling when threaded() is done
>> and try it again with all scenarios.
> I think this testcase is broken in more than 1 way. At least on my setup, I don't see
> a single pthread_detach() while signals are firing - which is exactly goal of this test.
>
> With following change:
>
> diff --git a/testcases/open_posix_testsuite/conformance/interfaces/pthread_detach/4-3.c b/testcases/open_posix_testsuite/conforman
> index dfa6e19..48e1343 100644
> --- a/testcases/open_posix_testsuite/conformance/interfaces/pthread_detach/4-3.c
> +++ b/testcases/open_posix_testsuite/conformance/interfaces/pthread_detach/4-3.c
> @@ -277,6 +276,7 @@ int main(int argc, char *argv[])
>                  do_it1 = 0;
>          } while (do_it1);
>
> +       output("  %d thread detached while signals were firing.\n", count_ope);
>          sleep(1);
>
>          do {
>
> I get:
> [16:11:23]  1 thread detached while signals are firing.
> [16:11:24]Test executed successfully.
> [16:11:24]  77865 thread detached.
>
> and that reported "1" is how many threads attempted to call pthread_detach, not how many actually
> succeeded. Signals are firing so frequently that threaded() can't progress at all.
Then how do we fix this case? sync sending the signals with pthread_detach?

Wanlong, any comments?

Thanks,
Kai

>
> Regards,
> Jan
>


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