C2 compiler bug closed as incomplete

[Vladimir Kozlov]

Hi Julien,

Thank you for additional information. I added it to 8038985 bug report.
So it look likes something went wrong in loop opts.
I pointed in the bug report that it could be related to 8039050. It was 
fixed in jdk8u20 b12. I see that you tested 8u20 b05. Can you download 
and test latest 8u20 b17?

Also, if you know how to build Hotspot JVM yourself, you can 'hg clone' 
latest sources from http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/ and 
build 'fastdebug' JVM. It has a lot of asserts which will help identify 
the problem. Just replace libjvm.so in jdk/jre/lib/amd64/server.

Regards,
Vladimir

On 6/4/14 2:34 AM, Julien Nicoulaud wrote:
> Hi,
>
> Here are some more tests as asked on the JIRA issue:
>   -XX:-PartialPeelLoop : no crash
>   -XX:-LoopUnswitching : still crashes
>   -XX:-SplitIfBlocks : still crashes
>   -XX:LoopUnrollLimit=0 : no crash
>   -XX:-RangeCheckElimination : still crashes
>
> => so it looks like PartialPeelLoop is the cause of the crash.
>
> I also tried these tests:
>   -XX:-PartialPeelAtUnsignedTests : no crash
>   -XX:+TracePartialPeeling : no crash
>   -XX:-BackgroundCompilation : no crash
>   -XX:+TracePartialPeeling -XX:CICompilerCount=8 : no crash
>
> It looks like a concurrency issue in PartialPeelLoop, but I can't find a
> way to reproduce it when logging is on.
>
> Regards,
> Julien
>
>
> 2014-04-11 11:39 GMT+02:00 Julien Nicoulaud <julien.nicoulaud at gmail.com
> <mailto:julien.nicoulaud at gmail.com>>:
>
>     Hi all, thanks for your answers.
>
>     I did some further testing and here is the results:
>       - JDK 8u20-b05 : still crashes, but not always - logs at
>     https://dl.dropboxusercontent.com/u/62997/JDK-8038985/8u20-b05.zip -
>     core dump at
>     https://dl.dropboxusercontent.com/u/62997/JDK-8038985/8u20-b05/core.16369.tar.bz2
>       - JDK 8u0 with -XX:-EliminateAutoBox : still crashes, but not
>     always - logs at
>     https://dl.dropboxusercontent.com/u/62997/JDK-8038985/8u0-no-EliminateAutoBox.zip
>
>     Also, since the crash always seems to occur when inlining Trove's
>     TCustomHashMap (http://trove.starlight-systems.com/) into my code, I
>     tried to:
>       - Upgrade Trove from 3.0.3 to 3.1a1 (from
>     https://bitbucket.org/robeden/trove/downloads) => still crashes
>       - Replace Trove by other hash map implementations => no crash
>
>     Regards,
>     Julien
>
>
>     2014-04-07 22:04 GMT+02:00 Christian Thalinger
>     <christian.thalinger at oracle.com
>     <mailto:christian.thalinger at oracle.com>>:
>
>
>         On Apr 7, 2014, at 2:39 AM, Volker Simonis
>         <volker.simonis at gmail.com <mailto:volker.simonis at gmail.com>> wrote:
>
>          > Really seems like a duplicate of
>          > https://bugs.openjdk.java.net/browse/JDK-8032566 "8032566:
>         Crash in
>          > JIT when running Scala compiler (and compiling Scala std lib)"
>          > although that one should have been fixed in jdk8 b127. On the
>         other
>          > hand it was not really fixed - just worked around by switched off
>          > autoboxing by default (you can double check with
>          > -XX:-EliminateAutoBox).
>          >
>          > Maybe the problem also appears even with autoboxing switched off?
>          >
>          > By the way, JIT replay data doesn't help without access to
>         the involved classes.
>
>         Right.  We would need the classes extracted from the core file.
>           Also I’ve moved the replay and hs_err data into files and
>         attached them to the bug report because the bug was unreadable
>         before.
>
>          >
>          > Regards,
>          > Volker
>          >
>          >
>          >
>          > On Sun, Apr 6, 2014 at 8:55 AM, Ivan Krylov
>         <ivan at azulsystems.com <mailto:ivan at azulsystems.com>> wrote:
>          >> bcc: discuss at openjdk.java.net <mailto:discuss at openjdk.java.net>
>          >> cc: hotspot-compiler-dev at openjdk.java.net
>         <mailto:hotspot-compiler-dev at openjdk.java.net>
>          >>
>          >>
>          >> Hi Julien,
>          >>
>          >> Hotspot-compiler-dev is the right alias from discussing C2
>         crashes. In the meantime may you can try the current the latest
>         EA build like 8u20 b05 [1]?
>          >>
>          >> Thanks,
>          >>
>          >> Ivan
>          >>
>          >> [1] - https://jdk8.java.net/download.html
>          >>
>          >> On 05 Apr 2014, at 13:57 , Julien Nicoulaud
>         <julien.nicoulaud at gmail.com <mailto:julien.nicoulaud at gmail.com>>
>         wrote:
>          >>
>          >>> Hi all,
>          >>>
>          >>> I don't know if it's the right place to discuss this, but
>         here is my issue :
>          >>>
>          >>> I reported a VM crash in C2 compilation, but it was closed
>         as incomplete
>          >>> with the following comment "We need a clear instructions
>         how to reproduce
>          >>> the problem".
>          >>>
>          >>> I clearly explained in the report I could not provide a simple,
>          >>> self-contained test case to reproduce the bug, and I
>         provided hs_err and
>          >>> JIT replay log file instead.
>          >>>
>          >>> So what am I supposed to do in this case ? Debug it myself
>         ? Or are there
>          >>> another options so I can provide useful debug output ?
>          >>>
>          >>> Here is the bug report:
>          >>> https://bugs.openjdk.java.net/browse/JDK-8038985
>          >>> http://bugs.java.com/bugdatabase/view_bug.do?bug_id=8038985
>          >>>
>          >>> Regards,
>          >>> Julien Nicoulaud
>          >>>
>          >>
>
>
>