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comparison test/gc_implementation/g1/TestNoEagerReclaimOfHumongousRegions.java @ 23569:f3f2f71d2dc8

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8139424: SIGSEGV, Problematic frame: # V [libjvm.so+0xd0c0cc] void InstanceKlass::oop_oop_iterate_oop_maps_specialized<true,oopDesc*,MarkAndPushClosure> Summary: The crash was caused by a faulty eager humongous reclaim. The reason for reclaiming a live object was that the call to cleanupHRRS was done after dirtying cards and clearing the remembered sets for the humongous object. This could lead to one or many cards being missed. Reviewed-by: tbenson, kbarrett, tschatzl
author dbuck
date Tue, 19 Jan 2016 18:16:40 +0000
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23491:88ae10297731 23569:f3f2f71d2dc8
1 /*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test TestNoEagerReclaimOfHumongousRegions
26 * @bug 8139424
27 * @summary Test to check that a live humongous object is not eagerly reclaimed. This is a regression test for
28 * 8139424 and the test will crash if an eager reclaim occur. The test is not 100% deterministic and
29 * might pass even if there are problems in the code, but it will never crash unless there is a problem.
30 * @requires vm.gc=="G1" | vm.gc=="null"
31 * @key gc
32 * @library /testlibrary /testlibrary/whitebox
33 * @modules java.base/sun.misc
34 * @build TestNoEagerReclaimOfHumongousRegions
35 * @run main ClassFileInstaller sun.hotspot.WhiteBox
36 * sun.hotspot.WhiteBox$WhiteBoxPermission
37 * @run main/othervm -Xbootclasspath/a:. -XX:+PrintGC -XX:+UseG1GC -XX:MaxTenuringThreshold=0 -XX:G1RSetSparseRegionEntries=32 -XX:G1HeapRegionSize=1m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UnlockExperimentalVMOptions -XX:+G1TraceEagerReclaimHumongousObjects TestNoEagerReclaimOfHumongousRegions
38 */
39
40 import java.util.LinkedList;
41
42 import sun.hotspot.WhiteBox;
43
44 public class TestNoEagerReclaimOfHumongousRegions {
45 // Helper class to keep reference to humongous byte[].
46 static class LargeRef {
47 private byte[] _ref;
48
49 LargeRef(byte[] ref) {
50 _ref = ref;
51 }
52
53 byte[] ref() { return _ref; }
54 }
55
56 static LargeRef humongous_reference_holder;
57
58 public static void main(String[] args) throws InterruptedException{
59 WhiteBox wb = WhiteBox.getWhiteBox();
60 LinkedList<Object> garbageAndRefList = new LinkedList<Object>();
61 // Creating a 1M large byte array. Since the test specifies the heap
62 // region size to be 1m this will be a humongous object. We then
63 // store a pointer to the array in the static object to keep it live
64 // during the whole test.
65 humongous_reference_holder = new LargeRef(new byte[1 * 1024 * 1024]);
66
67 // Create some garbage and a reference to the humongous object each round.
68 for (int i = 0; i < 32; i++) {
69 garbageAndRefList.add(new byte[400*1000]);
70 garbageAndRefList.add(new LargeRef(humongous_reference_holder.ref()));
71
72 // Promote to old, goal is to get rem-set entries for the humongous
73 // object from different regions. The test specifies MaxTenuringThreshold=0,
74 // this will make sure we get objects promoted to old at once.
75 wb.youngGC();
76 }
77 // Clear the garbage and reference list.
78 garbageAndRefList.clear();
79
80 // Run a concurrent mark cycle to mark all references but the static one as dead.
81 wb.g1StartConcMarkCycle();
82 while (wb.g1InConcurrentMark()) {
83 Thread.sleep(100);
84 }
85
86 // Run a young collection to make sure humongous object still can't be eagerly reclaimed.
87 wb.youngGC();
88 // Will crash/assert if humongous object has been reclaimed.
89 wb.fullGC();
90 }
91 }