RFR(S): JDK-8157236 - attach on ARMv7 fails with com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file

Dmitry Samersoff dmitry.samersoff at oracle.com
Thu Aug 11 16:55:55 UTC 2016


Please see updated webrev.


I didn't touch windows version because it quite different from *NIX one.


On 2016-08-08 02:40, David Holmes wrote:
> Hi Dmitry,
> On 5/08/2016 7:25 PM, Dmitry Samersoff wrote:
>> Everybody,
>> Please review the fix:
>>   http://cr.openjdk.java.net/~dsamersoff/JDK-8157236/webrev.02/
>> Problem:
>>   Tests fail intermittently because it can't attach to child process,
>>   these attach failures is hard to debug because attach framework
>>   doesn't provide enough diagnostic information.
>> Solution:
>>   a) Increase attach timeout
>>   b) Slightly change attach loop to save a bit of CPU power.
>>   c) Add some logging to attach listener.
>> It's just a first step in this direction. Complete cleanup of attach
>> code (remove LinuxThreads support and convert all printing to UL) is not
>> a goal of this fix - I'll file a separate CR for it.
> I still think you need more logging now to aid in debugging these cases.
> In particular we want to be able to verify that the path of the attach
> file is what we expect in all cases ie whether we find  the .attach_pid
> file in cwd or whether we are looking in temp directory, and whether we
> ultimately succeed or fail.
> Plus whatever you do now should be done consistently for all platforms.
> Thanks,
> David
>> -Dmitry

Dmitry Samersoff
Oracle Java development team, Saint Petersburg, Russia
* I would love to change the world, but they won't give me the sources.

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