JDK-8005067 : IGVN transformations don't always properly handle nodes that get disconnected
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 9
  • Priority: P5
  • Status: Closed
  • Resolution: Duplicate
  • OS: generic
  • CPU: generic
  • Submitted: 2012-12-14
  • Updated: 2019-09-13
  • Resolved: 2017-05-16
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JDK 10
10Resolved
Related Reports
Duplicate :  
JDK-8040213 - C2 does not put all modified nodes on IGVN worklist
Description
Some IGVN transformations sometimes disconnect nodes from the graph but the nodes are not properly enqueued on the IGVN worklist to be reclaimed. We should find those places and add the code so that dead nodes are processed again.
Comments
JDK-8040213 should ensure that modified nodes are put back on the IGVN worklist and reclaimed if possible. I don't think we can find more complex cases by manual code inspection or additional verification code. Closing this as duplicate.
16-05-2017
This is not urgent, setting fix version to 10.
25-05-2016
Here is list of some related bugs we hit before because of dead nodes in graph: JDK-8048879 JDK-8039050 JDK-8039298 JDK-8027626 JDK-8034216
19-04-2016
It's not clear how this problem is manifested, how often, what consequences
19-04-2016
ILW=LLL=P5
20-03-2014