Messages in this thread | | | Subject | Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.28-1 | From | Christian Meder <> | Date | Mon, 22 Nov 2004 10:31:00 +0100 |
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On Fri, 2004-11-19 at 10:54 +0100, Ingo Molnar wrote: > * Christian Meder <chris@onestepahead.de> wrote: > > > This just leaves me with the mysterious traceless jvm related crash. > > I'll do my best to get a trace ;-) > > it would be equally useful to somehow reproduce the lockup with public > software only, and post the precise steps how to reproduce it.
Hi Ingo,
after two evenings of experimenting this is the current status (everything based on 0.7.29-0, will try 0.7.30-x during the day):
* the lockup can't be triggered from the console or using a remote session and I really tried to torture the box ;-) * the real trigger is mouse activity in X * the other important factor is running the jvm in profiling mode, running without jvm or with the jvm in non-profiling mode leaves the box stable * I couldn't yet figure out the pattern of java program which is triggering. Not every java program is triggering but at least I found several public available ones. I wrote some small test programs doing simple multithreading but they didn't trigger.
So the simplest setup I found til now is the following:
chris@blue:~$ java -version java version "1.4.1" Java(TM) 2 Runtime Environment, Standard Edition (build Blackdown-1.4.1-01) Java HotSpot(TM) Client VM (build Blackdown-1.4.1-01, mixed mode) chris@blue:~$ JAVA_OPTIONS=-Xrunhprof:cpu=samples,file=crap.log,depth=3 jython Jython 2.1 on java1.4.1 (JIT: null) Type "copyright", "credits" or "license" for more information. >>>
Now moving the mouse around in X will make the box lockup in less than 10 seconds.
I'm not sure if JAVA_OPTIONS is a standard jython feature but at least it's part of the jython-wrapper script of Debian.
Christian
-- Christian Meder, email: chris@onestepahead.de
The Way-Seeking Mind of a tenzo is actualized by rolling up your sleeves.
(Eihei Dogen Zenji)
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