JDK-8327963 : [Umbrella] Incorrect result of C2 compiled code since JDK-8237581
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 15,17,21,23,24
  • Priority: P3
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2024-03-12
  • Updated: 2024-07-18
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JDK 24
24Unresolved
Related Reports
Duplicate :  
JDK-8336293 - C2 produces inconsistent results with loops with long trip counts
Duplicate :  
JDK-8336701 - Wrong Output of Program Using JDK21-Release Version - 2
Duplicate :  
JDK-8324739 - Incorrect result of C2 compiled code
Duplicate :  
JDK-8326992 - Incorrect result of C2 compiled code
Duplicate :  
JDK-8329984 - Incorrect result of C2 compiled code
Duplicate :  
JDK-8327868 - Incorrect result of C2 compiled code
Duplicate :  
JDK-8329535 - Wrong output of program running with jdk17u and oracle-jdk17-release
Duplicate :  
JDK-8329536 - Mis-compilation in jdk17, jdk21 and jdk23
Duplicate :  
JDK-8327012 - Incorrect result of C2 compiled code
Relates :  
JDK-8237581 - Improve allocation expansion
Sub Tasks
JDK-8324739 :  
Incorrect result of C2 compiled code - Closed
JDK-8326992 :  
Incorrect result of C2 compiled code - Closed
JDK-8327012 :  
Incorrect result of C2 compiled code - Closed
JDK-8327868 :  
Incorrect result of C2 compiled code - Closed
JDK-8329535 :  
Wrong output of program running with jdk17u and oracle-jdk17-release - Closed
JDK-8329536 :  
Mis-compilation in jdk17, jdk21 and jdk23 - Closed
JDK-8329984 :  
Incorrect result of C2 compiled code - Closed
JDK-8336293 :  
C2 produces inconsistent results with loops with long trip counts - Closed
JDK-8336701 :  
Wrong Output of Program Using JDK21-Release Version - 2 - Closed
Description
We recently got several reports of incorrect results of C2 compiled code since JDK-8237581 in JDK 15 b10. They all seem to have the same root cause, so I moved them to subtasks of this issue and closed them as duplicates. The regression tests provided in these reports should be added to the final fix.

If investigation shows that some of the issues are independent, they should be converted to separate bugs again.
Comments
Assigning to Roland who offered to take it over. Thanks a lot, Roland!
18-07-2024
https://github.com/openjdk/jdk/compare/master...rwestrel:jdk:JDK-8336293 is the fix I'm considering.
18-07-2024
Deferring from JDK23 -> JDK24, since this is an older issue (at least JDK15)
16-05-2024
Draft PR, with problem analysis: https://github.com/openjdk/jdk/pull/18265
15-05-2024
Added JDK-8329535 and JDK-8329536 which could also be traced back to JDK-8237581.
03-04-2024
ILW = Same as subtasks = P3
12-03-2024