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List:       openjdk-2d-dev
Subject:    [OpenJDK 2D-Dev] JVM crash in libc pre JDK7
From:       bccheng () google ! com (Ben Cheng)
Date:       2008-02-06 20:09:08
Message-ID: bcf6f6d40802061209k7d19ce9dm70c50c32151a7eec () mail ! gmail ! com
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Hi Phil,

Thanks for the extra information.

In the original bug report they claim that the crash can be reproduced with
the "ColorChooser Demo", but it is not the default component when the app
launches. Furthermore, through some manual experiments I found if the VM is
going to crash it usually takes less than 30 seconds.

So I hacked the code to make ColorChooser Demo the default mode when the app
is launched, and add a timer thread which will terminate the app after 30
seconds. Than I just use the following bash loop to run it infinitely:

while true; do java -jar SwingSet2.jar; done

With Java 6 I usually can get a crash within a couple hours. I tried
openjdk7 over the weekend but there was no single crash recorded.

If you want to access my modified SwingSet2.jar I can send it to you in a
private mail so that I won't bloat everyone's inbox.

Thanks,
-Ben

On Feb 6, 2008 11:26 AM, Phil Race <Phil.Race at sun.com> wrote:

> libdcpr.so is third party code that couldn't be included in openjdk,
> so there is a different, but lower-performing, replacement. Granted
> it doesn't crash for you, but it could have its own problems as
> its relatively untested.
>
> This only applies to openjdk. If you download the jdk7 commercial
> binary builds (pre-release of course), from
> http://download.java.net/jdk7/binaries/
> then you'll likely find it has the same problems as jdk6.
> So I don't know of any patch.
>
> Yes, there have been similar reports, with the common thread
> that they are mighty hard to reproduce.
>
> Precisely how did you use SwingSet over those two hours to produce the
> crash?
>
> What O/S and version are you using?
>
> -phil.
>
>
> Ben Cheng wrote:
> > Not sure this is the right place to ask this question, but I am going to
> > give it a try.
> >
> > We are seeing some JVM crashes in libc malloc()/free() invoked from
> > libdcpr.so with Java 6. After browsing the bug database there are a few
> > similar ones as described in 6510993 and 6645511. I used the SwingSet2
> > example from 6510993 as the benchmark and I usually can reproduce the
> > crash within a couple hours, but for some reason the crash is simply not
> > reproducible with openjdk7.
> >
> > With server VM build 1.6.0-b105 the stack trace in the core file looks
> > like the following:
> >
> >
> > #0  0xffffe410 in __kernel_vsyscall ()
> > #1  0x4bdce9a1 in raise () from /lib/tls/i686/cmov/libc.so.6
> > #2  0x4bdd02b9 in abort () from /lib/tls/i686/cmov/libc.so.6
> > #3  0x0643b36b in os::abort ()
> >    from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/server/libjvm.so
> > #4  0x0651c431 in VMError::report_and_die ()
> >    from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/server/libjvm.so
> > #5  0x0643f7a0 in JVM_handle_linux_signal ()
> >    from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/server/libjvm.so
> > #6  0x0643d058 in signalHandler ()
> >    from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/server/libjvm.so
> > #7  <signal handler called>
> > #8  0x4be0863b in malloc_consolidate () from
> /lib/tls/i686/cmov/libc.so.6
> > #9  0x4be09653 in _int_malloc () from /lib/tls/i686/cmov/libc.so.6
> > #10 0x4be0b411 in malloc () from /lib/tls/i686/cmov/libc.so.6
> > #11 0xb263a1c5 in doeMem_malloc ()
> >    from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/libdcpr.so
> > #12 0xb2643c61 in setOutputArea ()
> >    from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/libdcpr.so
> > #13 0xb263cdf4 in Java_sun_dc_pr_PathFiller_setOutputArea ()
> >    from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/libdcpr.so
> >
> > I checked the openjdk7 code structure and found that heavy redesign
> > seems happening under sun/dc, as everything below pr is simply gone.
> > That makes me believe that whatever the problem is on Java 6 it is
> > likely to be related to the implementation under pr.
> >
> > Here comes my main question: for people who rewrite sun/dc for openjdk7,
> > do you happen to know any patch to workaround the crashes in Java 6? We
> > are happy to try any patch to eliminate the annoying JVM crashes.
> >
> > Thanks,
> > -Ben
> >
>
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