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From "Anton Luht" <anton.l...@gmail.com>
Subject Re: [drlvm] HARMONY-956 - problem w/ DRLVM classloader
Date Mon, 14 Aug 2006 15:04:36 GMT
Hello,

I've found another issue trying to run activemq: HARMONY-1177 . I
think it's important - try/catch/return works incorrectly.

On 8/14/06, Geir Magnusson Jr <geir@pobox.com> wrote:
>
>
> Anton Luht wrote:
> > Hello,
> >
> > DRLVM has  an (undocumented?) option to switch off verifier
> > -Dvm.use_verifier=false . With this option activemq starts without
> > crash. Verifier seem to be the blocker.
>
> Odd.  even with that switch, I get a crash.  Of course, it's not the
> verifier.  Seems like ActiveMQ is a good app to focus on to get running
>
> geir
>
> >
> > On 8/8/06, Geir Magnusson Jr <geir@pobox.com> wrote:
> >>
> >>
> >> Gregory Shimansky wrote:
> >> > On Tuesday 08 August 2006 00:01 Geir Magnusson Jr wrote:
> >> >> Ok - I made that fix and still seem to have a problem, even after a
> >> >> clean rebuild.  I guess I should figure out how to turn on the
> >> trace...
> >> >
> >> > The problem is that class loader does not chain VerifyError to
> >> > NoClassDefFoundError so debugging such problems is diffucult without
> >> tracing.
> >> > I think this is a place for improvement in drlvm.
> >> >
> >> > I tried to fix the problem and found out that verifier just doesn't
> >> understand
> >> > exception handlers which point to the code length address (code end
> >> + 1). It
> >> > is a surprise that this problem didn't appear earlier.
> >>
> >> App-oriented testing... :)
> >>
> >> >
> >> > My patch attached to JIRA attempts to fix the problem in verifier
> >> only, the
> >> > application still fails to start. In default mode it exits silently,
> >> I didn't
> >> > find any exception logs or something. When using interpreter -Xint
> >> it fails
> >> > with ArrayStoreException still without any stack trace. I'll try to
> >> find out
> >> > what is happening.
> >>
> >> Nice work.  Thanks for doing this...
> >>
> >> geir
> >>
> >> >
> >> >> Anton Luht wrote:
> >> >>> Hello,
> >> >>>
> >> >>> The problem is with verifier.
> >> >>>
> >> >>> The code in Verifier.cpp:
> >> >>>
> >> >>>        if( ( start_pc >= len ) || ( end_pc >= len ) || (
> >> handler_pc >=
> >> >>> len ) )
> >> >>> ...
> >> >>>
> >> >>>            result = VER_ErrorHandler;
> >> >>>
> >> >>> I've modified error logging a bit to log values of start_pc, end_pc,
> >> >>> handler_pc and len and that's the output:
> >> >>>
> >> >>>
> >> >>> Loading message broker from: xbean:activemq.xml
> >> >>> vf_debug: VerifyError: (class:
> >> >>> edu/emory/mathcs/backport/java/util/concurrent/lo
> >> >>> cks/ReentrantLock$NonfairSync, method: lockInterruptibly()V, len:
> >> 103,
> >> >>> start_pc:
> >> >>> 87, end_pc: 103, handler_pc: 21) Handler pc is out of range
> >> >>> vf_debug: verifying class
> >> >>> edu/emory/mathcs/backport/java/util/concurrent/locks/R
> >> >>> eentrantLock (method <init>()V) couldn't load class
> >> >>> "edu/emory/mathcs/backport/j
> >> >>> ava/util/concurrent/locks/ReentrantLock$NonfairSync"
> >> >>> vf_debug: VerifyError:
> >> >>> edu/emory/mathcs/backport/java/util/concurrent/locks/Reen
> >> >>> trantLock$NonfairSync
> >> >>> Failed to execute main task. Reason: java.lang.NoClassDefFoundError:
> >> >>> edu/emory/m
> >> >>> athcs/backport/java/util/concurrent/locks/ReentrantLock$NonfairSync
> >> >>>
> >> >>> I'm not an expert in verification but seems like
> >> >>>
> >> >>> end_pc >= len
> >> >>> should be replaced with
> >> >>> end_pc > len
> >> >>>
> >> >>> On 8/5/06, Geir Magnusson Jr <geir@pobox.com> wrote:
> >> >>>> Anyone interested? :)
> >> >
> >>
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> >>
> >
> >
>
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>


-- 
Regards,
Anton Luht,
Intel Middleware Products Division

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