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  1. JDK
  2. JDK-8238756

C2: assert(((n) == __null || !VerifyIterativeGVN || !((n)->is_dead()))) failed: can not use dead node

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        Ran some tests with -XX:+VerifyIterativeGVN and hit the following assert:
        # Internal Error (open/src/hotspot/share/opto/node.hpp:411), pid=18949, tid=19027
        # assert(((n) == __null || !VerifyIterativeGVN || !((n)->is_dead()))) failed: can not use dead node

        V [libjvm.so+0x3d7ffc] Node::set_req(unsigned int, Node*)+0x26c
        V [libjvm.so+0x11fbf99] Node::replace_edge(Node*, Node*)+0x69
        V [libjvm.so+0x10430d0] PhaseIdealLoop::try_move_store_after_loop(Node*) [clone .part.120]+0x4f0
        V [libjvm.so+0x1047e7b] PhaseIdealLoop::split_if_with_blocks_post(Node*)+0x7ab
        V [libjvm.so+0x1048839] PhaseIdealLoop::split_if_with_blocks(VectorSet&, Node_Stack&)+0x1f9
        V [libjvm.so+0x103fc7d] PhaseIdealLoop::build_and_optimize(LoopOptsMode)+0x10fd
        V [libjvm.so+0x875d1a] PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x2ea

        This reproduces with different programs. One example is dacapo:
        $ java -XX:+VerifyIterativeGVN -jar dacapo-9.12-bach.jar avrora fop h2 jython luindex lusearch pmd sunflow xalan

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            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8239232 C2: assert(((n) == __null || !VerifyIterativeGVN || !((n)->is_dead()))) failed: can not use dead node

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8240480 C2: assert(((n) == __null || !VerifyIterativeGVN || !((n)->is_dead()))) failed: can not use dead node

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8240801 C2: assert(((n) == __null || !VerifyIterativeGVN || !((n)->is_dead()))) failed: can not use dead node

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8246670 C2: assert(((n) == __null || !VerifyIterativeGVN || !((n)->is_dead()))) failed: can not use dead node

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8189067 SuperWord optimization crashes with "assert(out == prev || prev == __null) failed: no branches off of store slice"

            • P1 - Blocks development and/or testing work, production could not run.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-8246203 Segmentation fault in verification due to stack overflow with -XX:+VerifyIterativeGVN

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8248521 TestVerifyIterativeGVN.java is failing with timeout

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

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                chagedorn Christian Hagedorn
                stefank Stefan Karlsson
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