[Kaffe] Illegal Instruction generated by kaffe JIT?

Moses DeJong dejong at cs.umn.edu
Mon Mar 29 23:35:30 PST 1999

On 29 Mar 1999, Alexandre Oliva wrote:

> On Mar 29, 1999, Moses DeJong <dejong at cs.umn.edu> wrote:
> > findNat 0x200020
> > Cannot access memory at address 0x1c.
> > findNat 0x2b283c
> > tcl/lang/ArrayObject.dereferenceArrayDims;(Ltcl/lang/Interp;Ljava/lang/Object;ILtcl/lang/TclObject;
> > )Ljava/lang/Object;: 2b27f0 2b2f18
> > So it seems like the problem is in the JIT compiled version of the
> > tcl/lang/ArrayObject.dereferenceArrayDims() method. Here is the
> > implementation in Java.

I get this error every time I run the Jacl regression tests under Kaffe
on Solaris. If you are interested, you can download the Jacl package
and run the regression tests yourself (www.cs.umn.edu/~dejong/tcl/tcljava).
I am going to try to create a standalone Java program that reproduces
this error as that seems to be the only way to focus in on the problem.


> Either that or the method at 0x200020 was inadvertently garbage
> collected (unlikely, but possible).  You may run it with -verbosejit
> and check whether any method is JIT compiled into that address.  BTW,
> is the error reproducible or it's a Heisenbug?
> > Does anyone know how I can focus the jit problem down to the Java
> > command that is compiled into the illegal instruction? 
> You may disassemble the region around the error in the failing frame,
> and the whole caller method, to try to figure out where's the problem:
> disassemble 0x200000 0x200080
> disass 0x2b27f0 0x2b2f18
> > Is there some sort of "jit debug" option that will include this info
> > into the executable so that gdb can read it?
> Unfortunately not.  This is one of the long-standing issues in my
> to-do list, but that I've never got the opportunity to start thinking
> of :-(
> -- 
> Alexandre Oliva http://www.dcc.unicamp.br/~oliva IC-Unicamp, Brasil
> {oliva,Alexandre.Oliva}@dcc.unicamp.br  aoliva@{acm.org,computer.org}
> oliva@{gnu.org,kaffe.org,{egcs,sourceware}.cygnus.com,samba.org}
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