Hotspot crash compiling sun.invoke.util.ValueConversions::identity

[Eirik Bjørsnøs]

Vladimir,

I have an hs_err file ready with a corresponding core dump file (176MB).

I'll zip these up and send a download link to you off-list.

Let me know if there is a better way to manage these files. Should we
have a Jira issue to track progress?

Thanks,
Eirik.

On Mon, Mar 2, 2015 at 4:01 PM, Vladimir Ivanov
<vladimir.x.ivanov at oracle.com> wrote:
> Eirik,
>
> Thanks for the report!
>
> As a first step, I'd like to see corresponding hotspot crash log
> (hs_err_pid*.log).
>
> It seems you stepped on a bug in invokedynamic implementation (lambdas are
> translated into indy calls on bytecode level) which happens when it is
> initialized too early in VM lifecycle (e.g. java agent premain).
>
> I'd be grateful for a stand-alone test case (focus on premain method logic)
> or steps how to reproduce it myself.
>
> Best regards,
> Vladimir Ivanov
>
> On 3/2/15 4:10 AM, Eirik Bjørsnøs wrote:
>>
>> Ladies and gentlemen,
>>
>> Last week, some of the world's brightest, most capable and all round
>> good looking Java developers gathered in Crested Butte, Colorado for
>> the Winter Tech Forum (WTF) 2015 [1].
>>
>> Wednesday was Hackathon Day, and a group of us decided to embark the
>> adventure of creating a live Java code coverage engine called Skybar
>> [2].
>>
>> We made good progress and by the afternoon we knew we'd have something
>> good to show at the 8pm showcase. So we confidently headed over to
>> Ryce Asian Bistro [3] at 17:30 for a nice team dinner.
>>
>> Luckily we went easy on the saké, because when we came back to
>> finalise our demo, we found that Hotspot had crashed:
>>
>> # A fatal error has been detected by the Java Runtime Environment:
>> #
>> #  SIGBUS (0xa) at pc=0x000000012a6d61e6, pid=10738, tid=18691
>> [..]
>> Compiled method (c2)  152453 1542       4
>> sun.invoke.util.ValueConversions::identity (2 bytes)
>>
>> Shock, horror! Our demo was just minutes away, would we be able to
>> present? Our team immediately went into debugging mode:
>>
>> Could we reproduce without using our -javaagent? No. Was the crash
>> consistently reproducible? Kind of, but we had to stress test our
>> code. Was there a any consistency in the hs_err reports? Yes, it
>> seemed to always involve lambda expressions in out agent code.
>>
>> The team decided we had to remove all lambdas from our agent code in
>> the hope that would improve the situation. And it did! At 7:50 PM, we
>> had a stable build and ran out to make it to the presentations.
>>
>> Skybar was very well received. Our demo worked. Nothing crashed.
>> Applause and shouts of "Ship it!" was heard from the audience. It was
>> good times. We headed over to the Princess Wine Bar [4] for some
>> celebratory drinks.
>>
>> The team is continuing our work on Skybar. But we miss our lamdas, and
>> we want them back! To achieve this, we need help from the Hotspot
>> team. On our side, we are willing to  work with you try to make
>> reproducible test cases and collect any other useful information.
>>
>> What would be the best next step in saving Lambas on Agents? We would
>> love to help out fixing this. Should we file an issue somewhere and
>> upload our hs_err file(s)?
>>
>> On behalf of the Skybar team -
>> Eirik,
>>
>> [1] http://www.mindviewinc.com/Conferences/JavaPosseRoundup/
>> [2] https://github.com/WinterTechForum/skybar
>> [3] http://www.ryceasianbistro.com
>> [4] https://www.facebook.com/princesswinebar
>>
>