threads006: internal error: scavenge_stack: weird activation record found on stack: 415597384
Found this while working on something else. This is a real bug that can cause random `scavenge_stack` failures at runtime, and could be the cause of #8866. I have a fix on the way...
<details><summary>Trac metadata</summary>
| Trac field | Value |
| ---------------------- | -------------- |
| Version | 7.8.2 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | highest |
| Resolution | Unresolved |
| Component | Runtime System |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | simonmar |
| Operating system | |
| Architecture | |
</details>
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