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[Xen-bugs] [Bug 633] New: JVM coredump leading to dom0/domU hanging

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Subject: [Xen-bugs] [Bug 633] New: JVM coredump leading to dom0/domU hanging
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Date: Wed, 03 May 2006 11:44:05 -0700
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           Summary: JVM coredump leading to dom0/domU hanging
           Product: Xen
           Version: democd-3.0
          Platform: x86
        OS/Version: Linux-2.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Guest-OS
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: sanjayl@xxxxxxxxxxx

A relatively simple Java + JNI program that gets a SEGV causes the dom0/domU to
hang.  The example (http://www.kymasys.com/java.jni.segv.tar.gz) consistently
reproduces the issue using the latest Xen 3.0 Test CD running the 32 bit
kernel.  Strangely, the issue does not happen with the PAE kernels from the
same Test CD.

The code basically calls a JNI function that does a NULL pointer access. We
expect this to dump core, but instead we never get back to the shell prompt and
the system hangs completely in about 30 seconds.

Instructions for reproducing the issue:

(1) Install the JDK (we are using v 1.5 update 4).
(2) Untar the example tarball (the example can be downloaded from
(3) from the segv directory execute the following command: "java
-Djava.library.path=. TestClass"

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