cmdLineTester_callsitedbgddrext_openj9 fail with jdk8,11,15 on linux and Macos

https://github.com/AdoptOpenJDK/run-aqa/runs/1526577429?check_suite_focus=true

The failure happened before. Looks like an intermittent one.

Testing: Run !printallcallsites
Test start time: 2020/12/09 21:47:46 Coordinated Universal Time
Running command: /opt/hostedtoolcache/jdk-11-openj9/1.0.0/x64/bin/jdmpview -core j9core.dmp
Time spent starting: 2 milliseconds
Time spent executing: 1546 milliseconds
Test result: FAILED
Output from test:
[OUT] DTFJView version 4.29.5, using DTFJ version 1.12.29003
[OUT] Loading image from DTFJ...
[OUT]
[OUT] Could not load dump file and/or could not load XML file: null
[OUT] For a list of commands, type "help"; for how to use "help", type "help help"
[OUT] > DDR is not enabled for this core file, '!' commands are disabled
[OUT] >
>> Success condition was not found: [Output match: jvminit.c]
>> Failure condition was not found: [Output match: DDRInteractiveCommandException]
>> Failure condition was not found: [Output match: no shared cache]
>> Failure condition was not found: [Output match: unable to read]
>> Failure condition was not found: [Output match: could not read]
>> Failure condition was not found: [Output match: dump event]

Testing: Run !findallcallsites
Test start time: 2020/12/09 21:47:48 Coordinated Universal Time
Running command: /opt/hostedtoolcache/jdk-11-openj9/1.0.0/x64/bin/jdmpview -core j9core.dmp
Time spent starting: 4 milliseconds
Time spent executing: 914 milliseconds
Test result: FAILED
Output from test:
[OUT] DTFJView version 4.29.5, using DTFJ version 1.12.29003
[OUT] Loading image from DTFJ...
[OUT]
[OUT] Could not load dump file and/or could not load XML file: null
[OUT] For a list of commands, type "help"; for how to use "help", type "help help"
[OUT] > DDR is not enabled for this core file, '!' commands are disabled
[OUT] >
>> Success condition was not found: [Output match: jvminit.c]
>> Failure condition was not found: [Output match: DDRInteractiveCommandException]
>> Failure condition was not found: [Output match: no shared cache]
>> Failure condition was not found: [Output match: unable to read]
>> Failure condition was not found: [Output match: could not read]
>> Failure condition was not found: [Output match: dump event]

Start with the linked GitHub Actions run and the cmdLineTester_callsitedbgddrext_openj9 cases for !printallcallsites and !findallcallsites on JDK 8, 11, and 15. Reproduce on Linux and macOS, then inspect why jdmpview cannot load j9core.dmp; the output conditions indicate the expected completion criteria.

Written by the indexing model from the issue text.