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From "Ivan Volosyuk" <ivan.volos...@gmail.com>
Subject Re: [drlvm] gc.LOS hangs on win32
Date Tue, 19 Sep 2006 16:23:19 GMT
On 9/19/06, Weldon Washburn <weldonwjw@gmail.com> wrote:
> On 9/19/06, Geir Magnusson Jr. <geir@pobox.com> wrote:
> >
> >
> > On Sep 19, 2006, at 2:18 AM, Weldon Washburn wrote:
> >
> > > All,
> > > I have noticed endless loop behavior when running gc.LOS.  It
> > > appears to go
> > > into some sort of endless loop when I try, " build test".  Does
> > > anyone else
> > > see this problem?
> > >
> > > I used MSVC to break into drlvm when it gets stuck.  It shows
> > > basically
> > > what's been reported before – a bunch of threads in JITed code.
> > > They keep
> > > making some system call.
> > >
> > > Semis/vm/_smoke.tests/reports/gc.LOS_jit.out shows that somehow
> > > LOS.java is
> > > in an infinite loop after it prints all 200 dots.  This is rather
> > > curious.
> > >
> > > Looking at gc/LOS.java, there is a "threads[i].join()" where "i"
> > > goes from 0
> > > to 199.  This thread join happens immediately after a "notifyAll()"
> > > that is
> > > intended to tell each of the threads to start running.
> > >
> > > I moved the trace(".") to immediately after the synchronized
> > > statement in
> > > run().  The test now completes successfully.  It might be a bug in the
> > > implementation of Object.wait() and Object.notifyAll() that
> > > different HW/SW
> > > combinations are aggrevating???   Below are the mods that I made:
> > >
> >
> > I'd not commit this... we need this to help us find what the problem is.
>
>
> Exactly.  Sorry for not being clearer.  I think it might be a bug in
> Object.wait() that we need to find.

Did you run gc.LOS as a part of 'build test' or separatly? I'm going
to get close to the problem, but I'm stuck with other tests which
fails for me before this one.

-- 
Ivan

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