[Bug runtime/21811] New: Java probe crashes upon null argument.

["penguin-kernel@i-love.sakura.ne.jp" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21811

            Bug ID: 21811
           Summary: Java probe crashes upon null argument.
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: penguin-kernel@i-love.sakura.ne.jp
  Target Milestone: ---

Description of problem:

While testing RHEL 7.4 beta's systemtap-3.1-3.el7.src.rpm package, I noticed
that
Java VM always crashes upon trying to probe some Java methods. I wondered why,
but
it turned out that, as of 8be03508058fbbf2 ("new example:
sizeof_interactive.stp"),
we are not yet ready to handle null argument.



Steps to reproduce:

(1) Create Class1.java as below and compile it and run it as usual.

---------- Class1.java ----------
public class Class1 {
        private static void method1(String obj) { }
        public static void main(String args[]) throws Exception {
                System.in.read();
                method1(null);
        }
}
---------- Class1.java ----------

    # javac Class1.java
    # java -cp . Class1

(2) Start SystemTap probe as below.

    # SYSTEMTAP_VERBOSE=1 stap -e 'probe
java("Class1").class("Class1").method("method1(String)") { println(arg1); }'

(3) Press Enter key at java process so that method1 with null argument is
called.



Expected result:

SystemTap probe should show something like "(null)".



Actual result:

Java VM crashes due to SIGSEGV.



Version information:

# rpm -q byteman
byteman-2.0.4-5.el7.noarch
# rpm -q java-1.7.0-openjdk
java-1.7.0-openjdk-1.7.0.141-2.6.10.1.el7_3.x86_64
# stap -V
Systemtap translator/driver (version 3.2/0.166, commit
release-3.1-137-g8be03508058f + changes)
Copyright (C) 2005-2017 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
tested kernel versions: 2.6.18 ... 4.11
enabled features: JAVA PYTHON2 NLS NSS READLINE

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