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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Many places have missing `PyErr_NoMemory()` call after failing memory allocation","articleBody":"# Crash report\n\n1. `remove_unused_consts` in `Python/flowgraph.c`\n\nWhen `PyMem_Malloc(nconsts * sizeof(Py_ssize_t));` fails, we need to set an exception.\n\nhttps://github.com/python/cpython/blob/29a920e80e21490b5bdb7178373f80fe606a4403/Python/flowgraph.c#L3267-L3283\n\n2. `gethandlelist` and `getattributelist` in `_winapi.c`\n\nThis place misses it:\n\nhttps://github.com/python/cpython/blob/9fdbade99e6bcc607d9f12416bfca5bbf94022b9/Modules/_winapi.c#L1196-L1198\n\nAll other error paths set exceptions, except this `if`:\n\nhttps://github.com/python/cpython/blob/9fdbade99e6bcc607d9f12416bfca5bbf94022b9/Modules/_winapi.c#L1278-L1282\n\n3. `_channelends_new` in `Modules/_interpchannelsmodule.c`\n\nhttps://github.com/python/cpython/blob/3ca93ab198497da9451101019b67c52e7873377d/Modules/_interpchannelsmodule.c#L920-L926\n\nLater we check for errors in `handle_channel_error`, it requires either setting `err` to non `-1` or to set Python exception. Both are false, it fails with the assertion failure.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-151127\n* gh-151134\n* gh-151135\n* gh-151136\n* gh-151137\n* gh-151154\n* gh-151180\n* gh-151181\n* gh-151182\n* gh-151239\n* gh-151265\n* gh-151266\n* gh-151336\n* gh-151338\n* gh-151339\n* gh-151360\n* gh-151361\n* gh-151362\n* gh-151382\n* gh-151398\n* gh-151399\n* gh-151400\n* gh-151580\n* gh-151582\n* gh-151588\n* gh-151590\n* gh-151624\n* gh-151639\n* gh-152014\n* gh-152015\n* gh-152016\n* gh-152169\n* gh-152170\n* gh-152177\n* gh-152179\n* gh-152180\n* gh-152181\n* gh-152182\n* gh-152183\n* gh-152184\n* gh-152418\n* gh-152420\n* gh-152421\n* gh-152422\n* gh-152478\n* gh-152677\n* gh-152678\n* gh-152720\n* gh-153215\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/sobolevn","@type":"Person","name":"sobolevn"},"datePublished":"2026-06-09T06:32:53.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/151126/cpython/issues/151126"}