Issues

Modernization roadmap: multi-phase init, stable ABI, free-threading, GC support, deprecated-API cleanup (discussion)

#302

· devdanzin opened

on Apr 19, 2026

CFFI backend parity gaps: garbled `ZstdError` messages, `exit` ordering mismatch with C backend, minor parameter-validation drift

#301

· devdanzin opened

on Apr 19, 2026

GIL held during long-running ZSTD operations: 7 sites (5 EOF compression finalizations + dictionary creation + dict-chain content-size)

#300

· devdanzin opened

on Apr 19, 2026

`MemoryError` silently swallowed in 20 sites: 18 `PyObject_HasAttrString` + 2 unguarded `PyErr_Clear` after `PyObject_GetBuffer` (silent data loss in `flush()` / `close()`)

#299

· devdanzin opened

on Apr 19, 2026

OOM-path hardening: ~45 sites crash on allocation failure (most critically: `ZstdError` NULL at module init cascades into ~50 error paths)

#298

· devdanzin opened

on Apr 19, 2026

Fix-propagation gaps: `compressionreader` missing 3 mirrors of fixes previously applied to `decompressionreader`

#297

· devdanzin opened

on Apr 19, 2026

Memory leaks in stream lifecycle: 4 `exit` + 2 `close()` discard CallMethod returns; 5 types leak on `init` re-call (~5.5 KB); 2 `Py_buffer` leaks on closed streams

#296

· devdanzin opened

on Apr 19, 2026

Silent data-correctness bug: `readinto()` / `readinto1()` on `stream_reader` return `tell() == 0` after successful reads

#295

· devdanzin opened

on Apr 19, 2026

Heap-type refcount imbalance: 19 dealloc sites miss `Py_DECREF(Py_TYPE(self))` + 4 factories bypass `tp_alloc` (type-object leak, latent crash)

#294

· devdanzin opened

on Apr 19, 2026

SystemError / wrong behavior: 15+ sites conflate error-return sentinels with data (`PyObject_IsTrue`, `PyObject_IsInstance`, `PyLong_AsSsize_t`)

#293

· devdanzin opened

on Apr 19, 2026

Segfault: 4+ unchecked `PyBytes_AsStringAndSize` on user `read()` return uses uninitialized memory

#292

· devdanzin opened

on Apr 19, 2026

Segfault: 12 types dereference NULL on `Type.new(Type)` without `init()`

#291

· devdanzin opened

on Apr 19, 2026

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Modernization roadmap: multi-phase init, stable ABI, free-threading, GC support, deprecated-API cleanup (discussion)

CFFI backend parity gaps: garbled `ZstdError` messages, `exit` ordering mismatch with C backend, minor parameter-validation drift

GIL held during long-running ZSTD operations: 7 sites (5 EOF compression finalizations + dictionary creation + dict-chain content-size)

`MemoryError` silently swallowed in 20 sites: 18 `PyObject_HasAttrString` + 2 unguarded `PyErr_Clear` after `PyObject_GetBuffer` (silent data loss in `flush()` / `close()`)

OOM-path hardening: ~45 sites crash on allocation failure (most critically: `ZstdError` NULL at module init cascades into ~50 error paths)

Fix-propagation gaps: `compressionreader` missing 3 mirrors of fixes previously applied to `decompressionreader`

Memory leaks in stream lifecycle: 4 `exit` + 2 `close()` discard CallMethod returns; 5 types leak on `init` re-call (~5.5 KB); 2 `Py_buffer` leaks on closed streams

Silent data-correctness bug: `readinto()` / `readinto1()` on `stream_reader` return `tell() == 0` after successful reads

Heap-type refcount imbalance: 19 dealloc sites miss `Py_DECREF(Py_TYPE(self))` + 4 factories bypass `tp_alloc` (type-object leak, latent crash)

SystemError / wrong behavior: 15+ sites conflate error-return sentinels with data (`PyObject_IsTrue`, `PyObject_IsInstance`, `PyLong_AsSsize_t`)

Segfault: 4+ unchecked `PyBytes_AsStringAndSize` on user `read()` return uses uninitialized memory

Segfault: 12 types dereference NULL on `Type.new(Type)` without `init()`

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