Date: Fri, 3 Sep 1999 02:06:50 -0400 From: Justin Wells <jread@semiotek.com> To: freebsd-java@freebsd.org Subject: 1.1.8 segfaults Message-ID: <19990903020650.A10276@semiotek.com>
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The latest version of the JDK 1.1.8 (both ELF and AOUT) segfaults
on one of my class files, reliably, at the same point. I tried it
on two different machines: a FreeBSD 3.2 machine with the ELF release;
and a 2.2.7 machine with the AOUT release installed. It crashes
on both at the same point.
It works fine under the 1.1.7 JDK, and it works fine under both
Linux JDK's (IBM and Blackdown). Interestingly enough, though, it
crashes the Kaffe VM in exactly the same way, at the same line. If
I remove that line, Kaffe and the 1.1.8 JVM are happy again.
I tried to create a trivial example that replicates the problem, but
I wasn't able to do it. So I could make a large package including
the current version of my software available, along with a shell
script that runs it in the way that shows the problem. Since it's
a pre-release version in the midst of a major code change, I don't
want to publish it--but I'll supply it privately to whoever wants
to try and debug this.
Please e-mail me as justin at the same domain (semiotek.com) and
ask me to send you a copy. (Replies to this message will wind up
in my mailing list inbox, which I often mass-delete when I am busy,
so send it to my regular account instead).
For the curious, it happens during some recursive introspection of a
hierarchy of classes. The particular Java expression that causes the
segfault is this:
iterClass.isAssignableFrom(returnType);
in the case that causes the segfault, iterClass is one of my
own private classes (org.webmacro.util.java2.Iterator) and
the returntype happens to be java.util.Enumeration.
However, who knows what actually caused the problem. Perhaps
something odd is happening on the stack.
I compiled with both 'jikes' and with 'javac' and the problem
results no matter which one is used, so I don't think it would
involve a compiler bug.
Justin
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