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9.0.x use-after-free crash #7333

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@shinrich

We resynced with the ASF 9.0.x branch as of 11/10. The resulting build crashes for us with production traffic within 15-60 minutes.

I split the discussion of PR #7237 to Issue #7338

The crash with PR #7237 has the InactivityCop on the stack. It appears to be trying to send the inactivity timeout to a freed continuation that is still being referenced by the read.vio. I believe that I have a fix for this issue, and will post a PR shortly.

The crash associated with PR #7278 appears to be a more general use after free. We are setting up our prod sim environment with an ASAN build to try and catch a more useful error.

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