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fix(example): fix mem step-2-gc shutdown abort (#383) - #386
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gg582 merged 2 commits intoOct 17, 2026
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cwist_alloc() does not produce TTAK-headered memory, so passing its output to cwist_reg_ptr_sized() and then calling cwist_gc_shutdown() (which runs ttak_epoch_gc_destroy) triggers TTAK header validation and aborts with "TTAK Memory Corruption detected (Header corrupted)". The correct paired pattern for deferred, epoch-safe release is cwist_ebr_alloc() + cwist_ebr_free() + cwist_gc_pipeline_tick(), which does not pass ownership to ttak_epoch_gc_destroy. The example is rewritten to use that pattern. cwist_gc_t is kept in the example to demonstrate cwist_gc_auto_rotate() and cwist_gc_shutdown() on a context with no registered pointers, which shuts down cleanly. Verified: the original main.c aborts at cwist_gc_shutdown(); the rewritten version exits at "Done" with status 0.
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cwist_alloc() does not produce TTAK-headered memory, so passing its output to cwist_reg_ptr_sized() and then calling cwist_gc_shutdown() (which runs ttak_epoch_gc_destroy) triggers TTAK header validation and aborts with "TTAK Memory Corruption detected (Header corrupted)". The correct paired pattern for deferred, epoch-safe release is cwist_ebr_alloc() + cwist_ebr_free() + cwist_gc_pipeline_tick(), which does not pass ownership to ttak_epoch_gc_destroy. The example is rewritten to use that pattern. cwist_gc_t is kept in the example to demonstrate cwist_gc_auto_rotate() and cwist_gc_shutdown() on a context with no registered pointers, which shuts down cleanly. Verified: the original main.c aborts at cwist_gc_shutdown(); the rewritten version exits at "Done" with status 0. Co-authored-by: 이윤진(Lee Yunjin) <168180007+gg582@users.noreply.github.com>
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example/mem/step-2-gc/main.c crashes on every run at cwist_gc_shutdown() because cwist_alloc()-allocated pointers are passed to cwist_reg_ptr_sized(). At shutdown, ttak_epoch_gc_destroy() runs header validation over the registered pointers. cwist_alloc() does not produce TTAK-headered memory, so the validation aborts with the fatal message reported in issue #383.
What this changes: main.c is rewritten to use cwist_ebr_alloc() + cwist_ebr_free() + cwist_gc_pipeline_tick() -- the correct paired pattern for epoch-based deferred release. cwist_gc_t is kept in the example to demonstrate cwist_gc_auto_rotate() and cwist_gc_shutdown() on a context with no registered pointers, which shuts down cleanly.
How it was verified: the original main.c aborts at the cwist_gc_shutdown() call, confirmed against the repro in issue #383. The rewritten version exits at "Done" with status 0.
What it does not do: does not change the cwist_reg_ptr or cwist_gc_shutdown implementation; the library-side fix is a separate concern.