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From 531dc8495cd3aabd3f659ecab604106fdbacbe98 Mon Sep 17 00:00:00 2001
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Message-Id: <531dc8495cd3aabd3f659ecab604106fdbacbe98.1554974459.git.pmatilai@redhat.com>
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From: Panu Matilainen <pmatilai@redhat.com>
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Date: Wed, 3 Oct 2018 11:51:38 +0300
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Subject: [PATCH] Fix ancient python GIL locking bug on callback
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(RhBug:1632488)
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Introduced in commit c7881d801745b4c156a8aa2afc17b95f97481e34 back in 2002,
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synthesizing a python object for the callback occurs before retaking
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the GIL lock, which is not allowed. Somehow this has managed to stay
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latent all these years, and even now requires fairly specific conditions:
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when the callback gets called without an associated key, such as erasures
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or file trigger script start/stop events (in the case of RhBug:1632488),
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when Python 3 is running in PYTHONMALLOC=debug mode,
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it crashes with "Python memory allocator called without holding the GIL".
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Simply retake the lock before any Python operations take place to fix.
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---
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python/rpmts-py.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/python/rpmts-py.c b/python/rpmts-py.c
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index e4c5e1250..1ddfc9a1e 100644
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--- a/python/rpmts-py.c
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+++ b/python/rpmts-py.c
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@@ -495,6 +495,8 @@ rpmtsCallback(const void * hd, const rpmCallbackType what,
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if (cbInfo->cb == Py_None) return NULL;
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+ PyEval_RestoreThread(cbInfo->_save);
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+
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/* Synthesize a python object for callback (if necessary). */
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if (pkgObj == NULL) {
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if (h) {
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@@ -506,8 +508,6 @@ rpmtsCallback(const void * hd, const rpmCallbackType what,
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} else
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Py_INCREF(pkgObj);
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- PyEval_RestoreThread(cbInfo->_save);
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-
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args = Py_BuildValue("(iLLOO)", what, amount, total, pkgObj, cbInfo->data);
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result = PyEval_CallObject(cbInfo->cb, args);
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Py_DECREF(args);
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--
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2.20.1
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