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8387015: C2: crash with "named projection 2 not found" from ArrayCopyNode::finish_transform() for clone

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Reviewed-by: qamai, kvn
This commit is contained in:
Roland Westrelin 2026-06-25 07:15:18 +00:00
parent 193de1b1c7
commit 07a52da1fe
2 changed files with 85 additions and 0 deletions
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6
src/hotspot/share/opto/arraycopynode.cpp
View File

@ -180,6 +180,12 @@ Node* ArrayCopyNode::try_clone_instance(PhaseGVN *phase, bool can_reshape, int c
return nullptr;
}
Node* out_mem = proj_out_or_null(TypeFunc::Memory);
if (can_reshape && out_mem == nullptr) { // dead node?
return NodeSentinel;
}
Node* base_src = in(ArrayCopyNode::Src);
Node* base_dest = in(ArrayCopyNode::Dest);
Node* ctl = in(TypeFunc::Control);

79
test/hotspot/jtreg/compiler/arraycopy/TestDeadCloneMem.java Normal file
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@ -0,0 +1,79 @@
/*
* Copyright (c) 2026 IBM Corporation. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @bug JDK-8387015
* @summary C2: crash with "named projection 2 not found" from ArrayCopyNode::finish_transform() for clone
* @run main/othervm -Xcomp -XX:+UnlockDiagnosticVMOptions -XX:CompileOnly=${test.main.class}::test1
* -XX:CompileCommand=dontinline,${test.main.class}::notInlined -XX:+StressIGVN
* -XX:StressSeed=1324432947 ${test.main.class}
* @run main/othervm -Xcomp -XX:+UnlockDiagnosticVMOptions -XX:CompileOnly=${test.main.class}::test1
* -XX:CompileCommand=dontinline,${test.main.class}::notInlined -XX:+StressIGVN
* ${test.main.class}
*/
package compiler.arraycopy;
public class TestDeadCloneMem {
private static int field;
public static void main(String[] args) {
int[] array = new int[10];
array.clone();
Object o = new Object();
test1(42, false);
}
private static int test1(int flag, boolean flag2) {
int len;
if (flag != 42) {
if (flag2) {
field = 42;
}
int[] array2;
if (flag != 42) {
len = -1;
array2 = new int[4];
} else {
len = 42;
array2 = new int[100];
}
int[] array = new int[len];
int length = array.length;
int i = 0;
do {
synchronized (new Object()) {}
notInlined();
array2.clone();
i++;
} while (i < 10);
return length;
}
return 0;
}
private static void notInlined() {
}
}