Hotspot crash compiling sun.invoke.util.ValueConversions::identity
eirbjo at gmail.com
Mon Mar 2 15:16:51 UTC 2015
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?
On Mon, Mar 2, 2015 at 4:01 PM, Vladimir Ivanov
<vladimir.x.ivanov at oracle.com> wrote:
> Thanks for the report!
> As a first step, I'd like to see corresponding hotspot crash 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 .
>> Wednesday was Hackathon Day, and a group of us decided to embark the
>> adventure of creating a live Java code coverage engine called Skybar
>> 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  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  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 -
>>  http://www.mindviewinc.com/Conferences/JavaPosseRoundup/
>>  https://github.com/WinterTechForum/skybar
>>  http://www.ryceasianbistro.com
>>  https://www.facebook.com/princesswinebar
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