RFR: SA: MacOS X: 8184042: several serviceability/sa tests timed out on MacOS X

[Jini George]

Thank you, David and Serguei.

- Jini.

On 10/10/2017 9:48 AM, serguei.spitsyn at oracle.com wrote:
> Hi Jini,
> 
> +1
> 
> Thanks,
> Serguei
> 
> 
> On 10/9/17 20:31, David Holmes wrote:
>> Thanks for your patience on this one Jini! The change looks good.
>>
>> Thanks,
>> David
>>
>> On 10/10/2017 2:15 AM, Jini George wrote:
>>> Hi all,
>>>
>>> I have created a webrev restoring the PT_ATTACH:
>>>
>>> http://cr.openjdk.java.net/~jgeorge/8184042/webrev.01/
>>>
>>> Have included Dmitry's comments on disabling the the deprecation 
>>> warning. I would like to request for reviews for this.
>>>
>>> Thank you,
>>> Jini.
>>>
>>>
>>> On 9/8/2017 3:09 AM, serguei.spitsyn at oracle.com wrote:
>>>> On 8/25/17 02:24, serguei.spitsyn at oracle.com wrote:
>>>>> Hi Jini,
>>>>>
>>>>>
>>>>> On 8/18/17 04:00, David Holmes wrote:
>>>>>> Hi Jini,
>>>>>>
>>>>>> Just reading the bug report and your description below this seems 
>>>>>> like a major change to try and use a facility (mach exceptions) 
>>>>>> that no one seems to have any experience with! That isn't 
>>>>>> something to be rushed.
>>>>>
>>>>>> Even if PT_ATTACH has been deprecated restoring its use may be the 
>>>>>> quick way forward instead of trying to rush in something like this.
>>>>>
>>>>> This approach looks reasonable to me.
>>>>
>>>> I've just realized that my statement might sound incorrectly.
>>>> I meant that the David's suggestion to restore the use of the 
>>>> deprecated PT_ATTACH looks reasonable.
>>>>
>>>> Sorry, if it caused any confusion.
>>>>
>>>> Thanks,
>>>> Serguei
>>>>
>>>>
>>>>> Otherwise, it would be nice to hear why it is not good.
>>>>> How much would it break the fix of the JDK-8182299?
>>>>>
>>>>> Thanks,
>>>>> Serguei
>>>>>
>>>>>>
>>>>>> Just my 2c.
>>>>>>
>>>>>> Cheers,
>>>>>> David
>>>>>>
>>>>>> On 18/08/2017 8:00 PM, Jini George wrote:
>>>>>>> Hi all,
>>>>>>>
>>>>>>> Requesting reviews for: 
>>>>>>> https://bugs.openjdk.java.net/browse/JDK-8184042
>>>>>>>
>>>>>>> Webrev: http://cr.openjdk.java.net/~jgeorge/8184042/webrev.00/
>>>>>>>
>>>>>>> Problem gist: The deprecated ptrace() command, PT_ATTACH was 
>>>>>>> changed to PT_ATTACHEXC, which causes mach exceptions (and not 
>>>>>>> UNIX signals) to be delivered via mach messages.This caused SA to 
>>>>>>> hang at waitpid() waiting for a signal, which does not arrive.
>>>>>>>
>>>>>>> Solution in a nutshell: The solution is to make the required 
>>>>>>> changes to handle mach 'soft signal' exceptions in the form of 
>>>>>>> mach messages instead of signals, while attaching to and 
>>>>>>> detaching from the target process. The detailed steps are 
>>>>>>> outlined in JBS.
>>>>>>>
>>>>>>> The changes appear huge due to the inclusion of pre-generated 
>>>>>>> mach exception handling files (mach_exc*). Since this is an 
>>>>>>> integration blocker, it would be great to get quick reviews on this.
>>>>>>>
>>>>>>> Thank you,
>>>>>>> Jini.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>
>>>>
>