NPE on tiered compilation only (seeking help to narrow it down)

[Uwe Schindler]

Sorry small typo:

> Hi,
> 
> thetaphi at serv1:~$ java -version
> java version "1.9.0-ea"
> Java(TM) SE Runtime Environment (build 1.9.0-ea-b78)
> Java HotSpot(TM) Server VM (build 1.9.0-ea-b78, mixed mode)
> thetaphi at serv1:~$
> 
> I also fails without tiered compilation. It just takes longer (maybe because of
> statistics are different). I was not able to make 64 bit JVM fail, on 32 bit it's
> very easy if you run the full Lucene test suite and give the right command line
> options for the JVM:
> - It does not fail with 64 bits (I tried like 20 runs of test suite, no success).
> - It does not fail with 32 bits and "-client" (I also tried 20 runs, no success).
> - It fails ASAP on 32 bits (in the first few Lucene tests with messages about
> random NPEs or failed assertions) with: "-server -Xbatch -
> XX:+TieredCompilation"
> - It also fails on 32 bits, but takes longer (like 60 tests of the suite ran): "-
> server -Xbatch -XX:+TieredCompilation"

Of course should be:

- It also fails on 32 bits without tiered compilation, but takes longer (like 60 tests of the suite ran): "-server -Xbatch -XX:-TieredCompilation"

> - Because it was not possible to reproducible on another machine (running
> Windows), which does not have AVX2 instruction set, so I tried to disable
> AVX(2) on 32 bits, but it still fails tests: "-server -Xbatch -XX:UseAVX=0" / "-
> server -Xbatch -XX:-UseSuperWord"
> 
> I will open a bug report with Rory and Balchandra giving the steps how to
> make the Lucene tests fail. We may help with trying stuff out, but we have
> no clue what's wrong. Especially every test run fails at a different place with
> various NPEs or test assertions failed.
> 
> The problems started around build 68.
> 
> Uwe
> 
> -----
> Uwe Schindler
> uschindler at apache.org
> ASF Member, Apache Lucene PMC / Committer
> Bremen, Germany
> http://lucene.apache.org/
> 
> > -----Original Message-----
> > From: Dawid Weiss [mailto:dawid.weiss at gmail.com]
> > Sent: Tuesday, August 25, 2015 12:06 PM
> > To: hotspot compiler
> > Cc: Uwe Schindler; Balchandra Vaidya
> > Subject: Re: NPE on tiered compilation only (seeking help to narrow it
> down)
> >
> > > 1. it happens on 32 bit and 64 bit JVMs (32 bit is easier to
> > > reproduce),
> >
> > Correction: so far we can only reproduce it on the 32-bit build. Uwe has
> been
> > trying to fail on 64 bit.
> >
> > Dawid