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

[Jan Stancek <jstancek@redhat.com>]

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.

Regards,
Jan

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