Hey all,

As you may have noticed, the nightly tests are failing. I've done some
digging and found that the O3 realview tests (the ARM ISA) are hanging and
reaching a timeout. You can reproduce this with:

```
python3 ./main.py run --uid
SuiteUID:tests/gem5/fs/linux/arm/test.py:realview-switcheroo-o3-ARM-x86_64-opt
--length long -j`nproc`
```

in the `tests` directory. This runs the command `./build/ARM/gem5.opt
tests/gem5/fs/linux/arm/run.py tests/gem5/configs/realview-switcheroo-o3.py
tests/gem5/resources/arm .` but you'll need to run with `./main.py` at
least once to download the correct resources needed.

Doing a git bisect on this I've found the first commit that triggers this:
https://gem5-review.googlesource.com/c/public/gem5/+/42109 , which is
problematic as I can't easily revert this as a quick, short term fix. I'm
attempting to come up with a fix that reverts this entire chain, as this
seems to be quite a fundamental problem that breaks the O3 CPU.

I'd really appreciate some help with this, such as finding a real fix. I
don't know, at this time, what the exact root cause of the bug is though.

This has been logged in Jira here:
https://gem5.atlassian.net/browse/GEM5-997

Kind regards,
Bobby
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616

web: https://www.bobbybruce.net
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