fix: preserve forkserver copy-on-write sharing - #7120
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Freeze forkserver-preloaded Python objects before job processes fork so child GC scans do not make inherited heap pages private. Add regression coverage for preload ordering and child garbage collection. Co-authored-by: Darshak Jankat <darshak.jankat@unifyapps.com>
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davidzhao
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Sep 4, 2026
chenghao-mou
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September 4, 2026 19:16
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Why: Full cyclic GC in a job process writes to inherited GC metadata and turns forkserver-shared heap pages private.
Behavior: Freeze completed preloads before forking. Tests protect ordering and child cycle collection.
Clarification: Use
Shared_Dirtyand PSS, notShared_Clean; the cost varies with preloaded plugins.Credit: Supersedes #7118 by @Darshak03, credited as a commit co-author.
Fixes #7117
Addresses AGT-3441
Initial prompt and agent context
Model: GPT-5.6