#210 Seg Fault in OpenJ9 java 17

[Satya Jyoti Das]

On running java -jar wrapper.jar, there is a segmentation fault with OpenJ9 Java 17 but seems to work fine with Temurin java 17.
There seems to be a memory layout issue for the Permit$Fake class.
Based on OpenJ9 class structure, the override field is placed at offset 4 instead of 8, as a result a write to the override field is causing accidental writes into accessCheckCache and resulting in bad object pointer and causing the crash.
Can additional field be added to fix this issue?

[rzo]

this is not the first report, that there are issues with J9. About 10 years ago, there was a bug in the JVM which resulted in the JVM crash.
Where can I download a binary of this version of the JVM ?

-- Ron

[Satya Jyoti Das]

Hi, you can download it from this link:
https://developer.ibm.com/languages/java/semeru-runtimes/downloads/

On Wed, Feb 12, 2025 at 11:49 PM rzo rzorzorzo@users.sourceforge.net
wrote:

this is not the first report, that there are issues with J9. About 10
years ago, there was a bug in the JVM which resulted in the JVM crash.
Where can I download a binary of this version of the JVM ?

-- Ron

[bugs:#210] https://sourceforge.net/p/yajsw/bugs/210/ Seg Fault in
OpenJ9 java 17

Status: open
Group: All
Labels: Seg Fault
Created: Thu Jan 30, 2025 09:39 AM UTC by Satya Jyoti Das
Last Updated: Thu Jan 30, 2025 09:39 AM UTC
Owner: nobody

On running java -jar wrapper.jar, there is a segmentation fault with
OpenJ9 Java 17 but seems to work fine with Temurin java 17.
There seems to be a memory layout issue for the Permit$Fake class.
Based on OpenJ9 class structure, the override field is placed at offset 4
instead of 8, as a result a write to the override field is causing
accidental writes into accessCheckCache and resulting in bad object pointer
and causing the crash.
Can additional field be added to fix this issue?

---

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