From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 76441 invoked by alias); 21 Jul 2017 11:13:01 -0000 Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: systemtap-owner@sourceware.org Received: (qmail 76329 invoked by uid 48); 21 Jul 2017 11:12:57 -0000 From: "penguin-kernel@i-love.sakura.ne.jp" To: systemtap@sourceware.org Subject: [Bug runtime/21811] New: Java probe crashes upon null argument. Date: Fri, 21 Jul 2017 11:13:00 -0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: systemtap X-Bugzilla-Component: runtime X-Bugzilla-Version: unspecified X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: penguin-kernel@i-love.sakura.ne.jp X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: systemtap at sourceware dot org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter target_milestone Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://sourceware.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2017-q3/txt/msg00057.txt.bz2 https://sourceware.org/bugzilla/show_bug.cgi?id=3D21811 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 w= hy, 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=3D1 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 --=20 You are receiving this mail because: You are the assignee for the bug.