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annotate test/compiler/6695810/Test.java @ 1960:878b57474103

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6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again Summary: An evacuation failure while copying the roots caused an object, A, to be forwarded to itself. During the subsequent RSet updating a reference to A was processed causing the reference to be added to the RSet of A's heap region. As a result of adding to the remembered set we ran into the issue described in 6930581 - the sparse table expanded and the RSet scanning code walked the cards in one instance of RHashTable (_cur) while the occupied() counts the cards in the expanded table (_next). Reviewed-by: tonyp, iveresov
author johnc
date Tue, 16 Nov 2010 14:07:33 -0800
parents c18cbe5936b8
children
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1 /*
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2 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test
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26 * @bug 6695810
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27 * @summary null oop passed to encode_heap_oop_not_null
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28 * @run main/othervm -Xbatch Test
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29 */
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30
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31 public class Test {
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32 Test _t;
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33
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34 static void test(Test t1, Test t2) {
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35 if (t2 != null)
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36 t1._t = t2;
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37
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38 if (t2 != null)
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39 t1._t = t2;
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40 }
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41
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42 public static void main(String[] args) {
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43 Test t = new Test();
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44 for (int i = 0; i < 50; i++) {
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45 for (int j = 0; j < 100; j++) {
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46 test(t, t);
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47 }
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48 test(t, null);
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49 }
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50 for (int i = 0; i < 10000; i++) {
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51 test(t, t);
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52 }
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53 test(t, null);
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54 }
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55 }