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From Dawid Weiss <dawid.we...@cs.put.poznan.pl>
Subject Re: JVM hanging when using G1GC on JDK8 b78 or b79 (Linux 32 bit)
Date Thu, 07 Mar 2013 09:30:26 GMT
I think I can help. Fetch this (sorry for putting together the whole world
-- space for time tradeoff):

http://ophelia.cs.put.poznan.pl/~dweiss/download/_g1gc.tar.gz

and unpack to, depending on which system you want to test on:

if on windows:
C:\_g1gc\

if on linux (32-bit!):
/tmp/_g1gc/

At the top of the archive there is a repro.sh (or repro.cmd for windows)
which reproduces the issue, JDK 1.8 included. I couldn't get it to hang on
a 1-cpu linux (vmware). on windows it hangs for me all the time.

Dawid

On Thu, Mar 7, 2013 at 7:44 AM, Uwe Schindler <uschindler@apache.org> wrote:

> Hi John,****
>
> ** **
>
> I only have time to work on a setup this evening Germen time, because I am
> on a business trip today. Will come back to you. Unfortunately I failed to
> quickly setup an easy classpath without Ivy downloading the JARS. ****
>
> ** **
>
> Uwe****
>
> ** **
>
> -----****
>
> Uwe Schindler****
>
> uschindler@apache.org ****
>
> Apache Lucene PMC Member / Committer****
>
> Bremen, Germany****
>
> http://lucene.apache.org/****
>
> ** **
>
> *From:* John Cuthbertson [mailto:john.cuthbertson@oracle.com]
> *Sent:* Thursday, March 07, 2013 12:49 AM
>
> *To:* Uwe Schindler
> *Cc:* 'Bengt Rutisson'; hotspot-gc-dev@openjdk.java.net;
> dev@lucene.apache.org
> *Subject:* Re: JVM hanging when using G1GC on JDK8 b78 or b79 (Linux 32
> bit)****
>
> ** **
>
> Hi Uwe,
>
> An update:
>
> I have downloaded ant and the lucerne source.
>
> I attempted the ivy-bootstrap but it failed to download the ivy=2.3.0.jar
> file - even after setting:
>
> ANT_OPTS=-Dhttp.proxyHost=<...> -Dhttp.proxyPort=<...>
>
> So I manually downloaded and placed it into the ANT library and now get:
>
>
> ****
>
> ivy-bootstrap1:
>     [mkdir] Skipping /home/jcuthber/.ant/lib because it already exists.
>      [echo] installing ivy 2.3.0 to /home/jcuthber/.ant/lib
>       [get] Getting:
> http://repo1.maven.org/maven2/org/apache/ivy/ivy/2.3.0/ivy-2.3.0.jar
>       [get] To: /home/jcuthber/.ant/lib/ivy-2.3.0.jar
>       [get] Error getting
> http://repo1.maven.org/maven2/org/apache/ivy/ivy/2.3.0/ivy-2.3.0.jar to
> /home/jcuthber/.ant/lib/ivy-2.3.0.jar
> [available] Found: /home/jcuthber/.ant/lib/ivy-2.3.0.jar
>
> ivy-bootstrap2:
> Skipped because property 'ivy.bootstrap1.success' set.
>
> ivy-checksum:
>
> ivy-bootstrap:
>
> BUILD SUCCESSFUL
> Total time: 3 minutes 46 seconds****
>
> Presumably I have to build the lucerne source before executing the tests.
> That seemed to go OK.
>
> When I run the analysis/uima tests it seems to get hung up at the
> "resolve" target - even without specifying G1:
>
>
> ****
>
> cairnapple{jcuthber}:408> cd analysis/uima/
> cairnapple{jcuthber}:409> ls -l
> total 29
> -rw-r--r--   1 jcuthber staff       1473 Dec 10 10:39 build.xml
> -rw-rw-r--   1 jcuthber staff       6895 Mar  6 15:20 hotspot.log
> -rw-r--r--   1 jcuthber staff       1316 Mar 30  2012 ivy.xml
> drwxr-xr-x   2 jcuthber staff          2 Mar  5 07:42 lib/
> drwxr-xr-x   6 jcuthber staff          6 Mar  5 07:42 src/****
>
>
>
> ****
>
> ivy-configure:
> [ivy:configure] Loading
> jar:file:/home/jcuthber/.ant/lib/ivy-2.3.0.jar!/org/apache/ivy/core/settings/ivy.properties
> [ivy:configure] :: Apache Ivy 2.3.0 - 20130110142753 ::
> http://ant.apache.org/ivy/ ::
> [ivy:configure] jakarta commons httpclient not found: using jdk url
> handling
> [ivy:configure] :: loading settings :: file =
> /export/bugs/8009536/lucene-5.0-2013-03-05_15-37-06/ivy-settings.xml
> [ivy:configure] no default ivy user dir defined: set to
> /home/jcuthber/.ivy2
> [ivy:configure] including url:
> jar:file:/home/jcuthber/.ant/lib/ivy-2.3.0.jar!/org/apache/ivy/core/settings/ivysettings-public.xml
> [ivy:configure] no default cache defined: set to /home/jcuthber/.ivy2/cache
> [ivy:configure] including url:
> jar:file:/home/jcuthber/.ant/lib/ivy-2.3.0.jar!/org/apache/ivy/core/settings/ivysettings-shared.xml
> [ivy:configure] including url:
> jar:file:/home/jcuthber/.ant/lib/ivy-2.3.0.jar!/org/apache/ivy/core/settings/ivysettings-local.xml
> [ivy:configure] including url:
> jar:file:/home/jcuthber/.ant/lib/ivy-2.3.0.jar!/org/apache/ivy/core/settings/ivysettings-main-chain.xml
> [ivy:configure] settings loaded (289ms)
> [ivy:configure]         default cache: /home/jcuthber/.ivy2/cache
> [ivy:configure]         default resolver: default
> [ivy:configure]         -- 7 resolvers:
> [ivy:configure]         working-chinese-mirror [ibiblio]
> [ivy:configure]         main [chain] [shared, public]
> [ivy:configure]         local [file]
> [ivy:configure]         shared [file]
> [ivy:configure]         sonatype-releases [ibiblio]
> [ivy:configure]         public [ibiblio]
> [ivy:configure]         default [chain] [local, main, sonatype-releases,
> working-chinese-mirror]
>
> resolve:
> [ivy:retrieve] no resolved descriptor found: launching default resolve
> Overriding previous definition of property "ivy.version"
> [ivy:retrieve] using ivy parser to parse
> file:/export/bugs/8009536/lucene-5.0-2013-03-05_15-37-06/analysis/uima/ivy.xml
> [ivy:retrieve] :: resolving dependencies ::
> org.apache.lucene#analyzers-uima;working@cairnapple
> [ivy:retrieve]  confs: [default]
> [ivy:retrieve]  validate = true
> [ivy:retrieve]  refresh = false
> [ivy:retrieve] resolving dependencies for configuration 'default'
> [ivy:retrieve] == resolving dependencies for
> org.apache.lucene#analyzers-uima;working@cairnapple [default]
> [ivy:retrieve] == resolving dependencies
> org.apache.lucene#analyzers-uima;working@cairnapple->org.apache.uima#Tagger;2.3.1
> [default->*]
> [ivy:retrieve] default: Checking cache for: dependency:
> org.apache.uima#Tagger;2.3.1 {*=[*]}
> [ivy:retrieve] don't use cache for org.apache.uima#Tagger;2.3.1:
> checkModified=true
> [ivy:retrieve]          tried
> /home/jcuthber/.ivy2/local/org.apache.uima/Tagger/2.3.1/ivys/ivy.xml
> [ivy:retrieve]          tried
> /home/jcuthber/.ivy2/local/org.apache.uima/Tagger/2.3.1/jars/Tagger.jar
> [ivy:retrieve]  local: no ivy file nor artifact found for
> org.apache.uima#Tagger;2.3.1
> [ivy:retrieve] main: Checking cache for: dependency:
> org.apache.uima#Tagger;2.3.1 {*=[*]}
> [ivy:retrieve]          tried
> /home/jcuthber/.ivy2/shared/org.apache.uima/Tagger/2.3.1/ivys/ivy.xml
> [ivy:retrieve]          tried
> /home/jcuthber/.ivy2/shared/org.apache.uima/Tagger/2.3.1/jars/Tagger.jar
> [ivy:retrieve]  shared: no ivy file nor artifact found for
> org.apache.uima#Tagger;2.3.1
> [ivy:retrieve]          tried
> http://repo1.maven.org/maven2/org/apache/uima/Tagger/2.3.1/Tagger-2.3.1.pom
> ****
>
> and there it hangs - presumably trying to access
> http://repo1.maven.org/maven2/org/apache/uima/Tagger/2.3.1/Tagger-2.3.1.pom
>
> There must be something with our proxy settings that that won't allow this.
>
> JohnC
>
>
> On 03/06/13 11:15, Uwe Schindler wrote: ****
>
> Hi,****
>
> ** **
>
> That's unfortunately not so easy, because of project dependencies. To run the test you
have to compile Lucene Core then the specific module + the test framework (which is special
for Lucene) and download some JARs from Maven central (JAR hell, as usual).****
>
> If you give me some time, I would collect all needed JAR files from my local checkout
and provide you the correct cmd line + a ZIP file with maybe a shell script to startup. It
should be doable, but needs some work to collect all dependencies for the classpath.****
>
> ** **
>
> If you want to do it quicker (should be quite fast to do):****
>
> - Download ANT 1.8.2 binary zip (unfortunately ANT 1.8.4 has a bug making it not working
out of the box with Java 8): http://archive.apache.org/dist/ant/binaries/apache-ant-1.8.2-bin.tar.gz
- I just wonder about the fact: isn't ANT needed to build the JDK classlib by itself? I remember
that the FreeBSD OpenJDK build downloads ANT and does a large part of the compilation using
ANT...****
>
> - put the ANT bin/ dir into your PATH****
>
> - download the Apache Lucene source code from Jenkins: https://builds.apache.org/job/Lucene-Artifacts-trunk/2212/artifact/lucene/dist/lucene-5.0-2013-03-05_15-37-06-src.tgz****
>
> - go to extracted lucene source dir, call "ant ivy-bootstrap" (this will download Apache
IVY, so all dependencies can be downloaded from Maven Central)****
>
> - change to the module that fails: # cd analysis/uima****
>
> - execute: # ant -Dargs="-server -XX:+UseG1GC" -Dtests.multiplier=3 -Dtests.jvms=1 test****
>
> - In a parallel console you might be able to attach to the process, the build in the
main console using ANT runs inside ANT and the test framework spawns separate worker instances
of the JVM to execute the tests. This makes it hard to reproduce in standalone (the command
line passed to the child JVM is veeeeery long).****
>
> ** **
>
> I will work on putting together a precompiled ZIP file with all needed JARs + the command
line. Just tell me if you got it managed with the above howto, then I don’t need to do this.****
>
> Uwe****
>
> ** **
>
> -----****
>
> Uwe Schindler****
>
> uschindler@apache.org ****
>
> Apache Lucene PMC Member / Committer****
>
> Bremen, Germany****
>
> http://lucene.apache.org/****
>
> ** **
>
> ** **
>
>   ****
>
> -----Original Message-----****
>
> From: John Cuthbertson [mailto:john.cuthbertson@oracle.com <john.cuthbertson@oracle.com>]****
>
> Sent: Wednesday, March 06, 2013 7:51 PM****
>
> To: Uwe Schindler****
>
> Cc: 'Bengt Rutisson'; hotspot-gc-dev@openjdk.java.net;****
>
> dev@lucene.apache.org****
>
> Subject: Re: JVM hanging when using G1GC on JDK8 b78 or b79 (Linux 32 bit)****
>
> ** **
>
> Hi Uwe,****
>
> ** **
>
> I've downloaded  lucene-5.0-2013-03-05_15-37-06.zip from****
>
> https://builds.apache.org/job/Lucene-Artifacts-****
>
> trunk/2212/artifact/lucene/dist/****
>
> ** **
>
> I don't have ant on my workstation so do you have a java command line to****
>
> run the test(s) that generate the error?****
>
> ** **
>
> Thanks,****
>
> ** **
>
> JohnC****
>
> ** **
>
> On 3/6/2013 3:16 AM, Uwe Schindler wrote:****
>
>     ****
>
> Hi,****
>
> ** **
>
>       ****
>
> I think this is a VM bug and the thread dumps that Uwe produced are****
>
> enough to start tracking down the root cause.****
>
>         ****
>
> I hope it is enough! If I can help with more details, tell me what I should do****
>
>
>       ****
>
> to track this down. Unfortunately, we have no isolated test case (like a small****
>
> java class that triggers this bug) - you have to run the test cases of this****
>
> Lucene's module. It only happens there, not in any other Lucene test suite. It****
>
> may be caused by a lot of GC activity in this "UIMA" module or a specific test.****
>
>     ****
>
> On 3/6/13 8:52 AM, David Holmes wrote:****
>
>         ****
>
> If the VM is completely unresponsive then it suggests we are at a****
>
> safepoint.****
>
>           ****
>
> Yes, we are hanging during a stop-the-world GC, so we are at a safepoint.****
>
> ** **
>
>         ****
>
> The GC threads are not "hung" in os::parK, they are parked - waiting****
>
> to be notified of something.****
>
>           ****
>
> It looks like the reference processing thread is stuck in a loop****
>
> where it does wait(). So, the VM is hanging even if that stack trace****
>
> also ends up in os::park().****
>
> ** **
>
>         ****
>
> The thing is to find out why they are not being woken up.****
>
>           ****
>
> Actually, in this case we should probably not even be calling wait...****
>
> ** **
>
>         ****
>
> Can the gdb log be posted somewhere? I don't know if the attachment****
>
> made it to the original posting on hotspot-gc but it's no longer****
>
> available on hotspot-dev.****
>
>           ****
>
> I received the attachment with the original email. I've attached it****
>
> to the bug report that I created: 8009536. You can find it there if****
>
> you want to. But I think we have a fairly good idea of what change****
>
> caused the hang.****
>
>         ****
>
> If it helps: Unfortunately, we had some problems with recent JDK builds,****
>
>       ****
>
> because javac and javadoc tools were not working correctly, failing to build****
>
> our source code. Since b78 this was fixed. Until this was fixed, we used build****
>
> b65 (which was the last one working) and the G1GC hangs did not appear on****
>
> this version. So it must have happened by a change after b65 till b78.****
>
>     ****
>
> Uwe****
>
> ** **
>
>       ****
>
> Bengt****
>
> ** **
>
>         ****
>
> Thanks,****
>
> David****
>
> ** **
>
> On 6/03/2013 4:07 PM, Krystal Mok wrote:****
>
>           ****
>
> Hi Uwe,****
>
> ** **
>
> If you can attach gdb onto it, and jstack -m and jstack -F should****
>
> also work; that'll get you the Java stack trace.****
>
> (But it probably doesn't matter in this case, because the hang is****
>
> probably bug in the VM).****
>
> ** **
>
> - Kris****
>
> ** **
>
> On Wed, Mar 6, 2013 at 5:48 AM, Uwe Schindler****
>
>             ****
>
> <uschindler@apache.org> <uschindler@apache.org>****
>
>         ****
>
> wrote:****
>
>             ****
>
> Hi,****
>
> ** **
>
> since a few month we are extensively testing various preview****
>
> builds of JDK 8 for compatibility with Apache Lucene and Solr, so****
>
> we can find any bugs early and prevent the problems we had with****
>
> the release of Java 7 two years ago. Currently we have a Linux****
>
> (Ubuntu 64bit) Jenkins machine that has various JDKs (JDK 6, JDK****
>
> 7, JDK 8 snapshot, IBM J9, older JRockit) installed, choosing a****
>
> different one with different hotspot and garbage collector****
>
> settings on every run of the test suite (which takes approx. 30-45****
>
>               ****
>
> minutes).****
>
>     ****
>
>  JDK 8 b79 works so far very well on Linux, we found some strange****
>
> behavior in early versions (maybe compiler errors), but no longer****
>
> at the moment. There is one configuration that constantly and****
>
> reproducibly hangs in one module that is tested: The configuration****
>
> uses JDK 8 b79 (same for b78), 32 bit, and G1GC (server or client****
>
> does not matter). The JVM running the tests hangs irresponsible****
>
> (jstack or kill -3 have no effect/cannot connect, standard kill****
>
> does not stop it, only kill -9 actually kills it). It can be****
>
> reproduced in this Lucene module 100% (it hangs always).****
>
> ** **
>
> I was able to connect with GDB to the JVM and get a stack trace on****
>
> all threads (see attachment, dump.txt). As you see all threads of****
>
> G1GC seem to hang in a syscall (os:park(), a conditional wait in****
>
> pthread library). Unfortunately that’s all I can give you. A Java****
>
> stacktrace is not possible because the JVM reacts on neither kill****
>
> -3 nor jstack. With all other garbage collectors it passes the****
>
> test without hangs in a few seconds, with 32 bit G1GC it can stand****
>
> still for hours. The 64 bit JVM passes with G1GC, so only the 32****
>
> bit variant is affected. Client or Server VM makes no difference.****
>
> ** **
>
> To reproduce:****
>
> - Use a 32 bit JDK 8 b78 or b79 (tested on Linux 64 bit, but this****
>
> should not matter)****
>
> - Download Lucene Source code (e.g. the snapshot version we were****
>
> testing with:****
>
> https://builds.apache.org/job/Lucene-Artifacts-****
>
>               ****
>
> trunk/2212/artifact/lucene/dist/)****
>
>         ****
>
> - change to directory lucene/analysis/uima and run:****
>
>           ant -Dargs="-server -XX:+UseG1GC" -Dtests.multiplier=3****
>
> -Dtests.jvms=1 test****
>
> After a while the test framework prints "stalled" messages****
>
> (because the child VM actually running the test no longer****
>
>
> responds). The PID is also printed. Try to get a stack trace or kill it, no****
>
>               ****
>
> response.****
>
>     ****
>
> Only kill -9 helps. Choosing another garbage collector in the****
>
> above command line makes the test finish after a few seconds, e.g.****
>
> -Dargs="-server -XX:+UseConcMarkSweepGC"****
>
> ** **
>
> I posted this bug report directly to the mailing list, because****
>
> with earlier bug reports, there seem to be a problem with****
>
> bugs.sun.com - there is no response from any reviewer after****
>
> several weeks and we were able to help to find and fix javadoc and****
>
> javac-compiler bugs early. So I hope you can help for this bug, too.****
>
> ** **
>
> Uwe****
>
> ** **
>
> -----****
>
> Uwe Schindler****
>
> uschindler@apache.org****
>
> Apache Lucene PMC Member / Committer Bremen, Germany****
>
> http://lucene.apache.org/****
>
> ** **
>
> ** **
>
>               ****
>
> ** **
>
>   ****
>
> ** **
>

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