Assert from swalk.c when using memory disclaiming on NFS

[JamesKingdon]

A customer reported failures with JRE 17 Linux amd64-64 (build 17.0.12+7) and JRE 21 Linux amd64-64 (build 21.0.4+7-LTS) with the symptom of

j9vm.249    *   ** ASSERTION FAILED ** at /home/jenkins/workspace/build-scripts/jobs/jdk17u/jdk17u-linux-x64-openj9/workspace/build/src/openj9/runtime/vm/swalk.c:1629: ((0 ))

Corefile analysis shows large areas of memory reading as 0, and mmap'd to files with names starting with .nfs in the current working directory.

The problem can be avoided with the option -Xjit:disableDataCacheDisclaiming,disableIprofilerDataDisclaiming

This relates to issue #20239 however the customer has tested with the 0.48 m1 build and reports that the problem still exists, albeit with a different line number:

j9vm.249    *   ** ASSERTION FAILED ** at /home/jenkins/workspace/build-scripts/jobs/jdk17u/jdk17u-linux-x64-openj9/workspace/build/src/openj9/runtime/vm/swalk.c:1633: ((0 ))

Internal case reference: TS017553893

[github-actions]

Issue Number: 20509
Status: Open
Recommended Components: comp:vm, comp:gc, comp:build
Recommended Assignees: babsingh, jasonfengj9, pshipton

[JamesKingdon]

I haven't checked that the change for 20239 is in the m1 build, but it seems probable.

[pshipton]

If you are referring to the fix for 20239, i.e. eclipse-openj9/openj9-omr#215, then it's not in the m1 build.

The rc1 build does include it. I've provided it here https://ibm.box.com/s/3euojkv5pmk3x3yksbz3v9dqzvxrxrc8

[JamesKingdon]

Ah, good to know, thank you Peter. I'll pass the info on.

[JamesKingdon]

Customer reports success with the RC1 build - many thanks!
I'll close this issue given this information, it can always be reopened if more problems come to light.

[github-actions]

Issue Number: 20509
Status: Closed
Actual Components: comp:jit
Actual Assignees: No one :(
PR Assignees: No one :(