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

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

On 2012年08月22日 15:06, 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 4:29:25 AM
>> Subject: Re: [LTP] [PATCH] pthread_detach/4-3: workaround for segment fault
>>
>> On 2012年08月21日 18:35, 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: Tuesday, 21 August, 2012 11:59:19 AM
>>>> Subject: Re: [LTP] [PATCH] pthread_detach/4-3: workaround for
>>>> segment fault
>>> <snip>
>>>
>>>> Hi Jan,
>>>>
>>>> Thanks.
>>>> I am sorry that It doesn't work and still "segment fault".
>>> Maybe we can narrow it down by running only subset of scenarios.
>>> I would suggest trying to limit "sc" or "NSCENAR" and see which
>>> one triggers it.
>>>
>>> Another thing that looks suspicious are scenarios with altstack,
>>> there seems
>>> to be small window where more than 1 thread can use same altstack.
>>> Can you try to reproduce it without altstack scenarios?
>>>
>>> diff --git
>>> a/testcases/open_posix_testsuite/conformance/interfaces/pthread_detach/4-3.c
>>> b/testcases/open_posix_testsuite/conforman
>>> index 5c15e93..63b6ee7 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
>>> @@ -162,6 +162,11 @@ static void *test(void *arg)
>>>                   output("Starting test with scenario (%i): %s\n",
>>>                          sc, scenarii[sc].descr);
>>>    #endif
>> Hi Jan,
>>
>>> +               if (scenarii[sc].altstack) {
>>> +                       sc++;
>>> +                       sc %= NSCENAR;
>>> +                       continue;
>>> +               }
>>>
>> It fails with another error randomly, and output is:
>>
>> [09:45:16]System abilities:
>> [09:45:16] TSA: 200809
>> [09:45:16] TSS: 200809
>> [09:45:16] TPS: 200809
>> [09:45:16] pagesize: 4096
>> [09:45:16] min stack size: 16384
>> [09:45:16]WARNING: The TPS option is claimed to be supported but
>> setscope fails
>> [09:45:16]WARNING: The TPS option is claimed to be supported but
>> setscope fails
>> [09:45:16]WARNING: The TPS option is claimed to be supported but
>> setscope fails
>> [09:45:16]WARNING: The TPS option is claimed to be supported but
>> setscope fails
>> [09:45:16]WARNING: The TPS option is claimed to be supported but
>> setscope fails
>> [09:45:16]WARNING: The TPS option is claimed to be supported but
>> setscope fails
>> [09:45:16]WARNING: The TPS option is claimed to be supported but
>> setscope fails
>> [09:45:16]WARNING: The TPS option is claimed to be supported but
>> setscope fails
>> [09:45:16]WARNING: The TPS option is claimed to be supported but
>> setscope fails
>> [09:45:16]All 33 thread attribute objects were initialized
>>
>> [09:45:18]Test ../../../conformance/interfaces/pthread_detach/4-3.c
>> unresolved: got 12 (Cannot allocate memory) on line 179 (Failed to
>> create this thread)

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.
It passes on routerstation(mips) with your patch too.
So it looks like a race condition issue about stack attribute between 
threads, right?

Thanks a lot.
Kai

>
> Regards,
> Jan
>
>>
>> Regards,
>> Kai
>>
>>>                   count_ope++;
>>>
>>>
>>> Regards,
>>> Jan
>>>
>>>> Regards,
>>>> Kai
>>>>
>>


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