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Fix Kotlin coroutines losing scopes when resumed on another thread - #12864

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mcculls/kotlin-shared-scope-stack

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Fix Kotlin coroutines losing scopes when resumed on another thread#12864
mcculls wants to merge 26 commits into
masterfrom
mcculls/kotlin-shared-scope-stack

Commits on Oct 14, 2026
- Port Kotlin suspension handoff tests and run latestDepTest on kotlinx 1.8
  
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- Share each Kotlin coroutine's scope stack between its worker threads
  
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  4c70b8f
- Add unit tests for shared coroutine scope stacks
  
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  7b922f0
- Avoid needless locking when swapping shared scope stacks
  
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  c3b2ca5
- Skip trace continuations for structured Kotlin child coroutines
  
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  fa7a117
- Treat children of scoped coroutines as structured Kotlin children
  
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  cf9a891
- Give saved and shared scope stack contexts a common base
  
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  a8bfcdf
- Read the shared scope stack's top and depth without locking
  
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  1504a0b
- Reuse the token that swaps a thread's own scope stack back after a coroutine
  
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  63ce94a
- Don't keep a Kotlin coroutine's parent context alive after capturing it
  
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  bb47eee
- Name the reusable scope stack token after its same-thread guarantee
  
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- Publish the shared scope stack's depth through its volatile top
  
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  d3d8c9d
- Tidy the Kotlin element's context capture and activation
  
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  a5df070
- Publish a shared scope stack's new top before activation listeners run
  
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  38607b2
- Update shared scope reference counts under the stack's lock
  
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  f13ae79
- Guard a shared scope's reference count on the scope itself
  
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  513b673
- Clear a shared scope's reference count under its lock
  
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  43a69b3
- Clarify shared scope cleanup visibility
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  2da5c66
- Bound shared scope stress test shutdown and clarify comments
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  8ceb2e6
- Avoid allocating a lambda when replacing coroutine context elements
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  c0cdb74
- Simplify coroutine regression tests and bound worker shutdown
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  5657855
- Document scope concurrency invariants in narrow SpotBugs suppressions
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  b20c584
- Cover scope context views and cross-thread restoration
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  0c7bb96
Commits on Oct 15, 2026
- Fix scoped coroutines releasing their owner's trace continuation
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  f3f8dc8
Commits on Oct 16, 2026
- Fix Kotlin continuation leak when launching with a cancelled parent
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  e4ba85d
- Fix scope listener ordering when restoring coroutine stacks
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  committed
  3efdc69

Commits

Commits on Oct 14, 2026

Commits on Oct 15, 2026

Commits on Oct 16, 2026