[9] RFR(XS): 8086057: Crash with "modified node is not on IGVN._worklist" when running with -XX:-SplitIfBlocks

Tobias Hartmann tobias.hartmann at oracle.com
Thu Apr 21 10:11:03 UTC 2016


please review the following patch:


The fastdebug VM crashes with "modified node is not on IGVN._worklist" because SuperWord::align_initial_loop_index() resets the input of the pre-loop Opaque1 node 'pre_opaq' without putting it on the IGVN worklist afterwards. This only shows up with -XX:-SplitIfBlocks because otherwise surrounding nodes are changed causing the OpagueNode to be put on the worklist. The method should use PhaseIterGVN::replace_input_of() which uses rehash_node_delayed() to ensure the modified node is put on the worklist.

Tested with regression test, Nashorn+Octane with -XX:-SplitIfBlocks and RBT (running).


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