Description

serhiy-storchaka

opened on Aug 20, 2026

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CPython defines 375 attributes with PyMemberDef and PyGetSetDef (excluding the _test* modules), but the test suite never assigns to 187 of them and never deletes 332 of them.

Deletion in particular is almost untested, although it is a separate code path: the setter is called with NULL, and an implementation which does not expect this crashes or leaves the object in a broken state.

Three bugs found this way are gh-156099, gh-156100 and gh-156101; gh-152817 is another one.

The following PR adds writing and deleting tests for each writable attribute.

Linked PRs

• gh-156106: Add tests for setting and deleting attributes defined in C #156107
• [3.14] gh-156106: Add tests for setting and deleting attributes defined in C (GH-156107) #156184
• [3.13] gh-156106: Add tests for setting and deleting attributes defined in C (GH-156107) #156191
• [3.15] gh-156106: Add tests for setting and deleting attributes defined in C (GH-156107) #159086

Activity

1. serhiy-storchaka

   added

   testsTests in the Lib/test dirTests in the Lib/test dir

   on Aug 20, 2026
2. serhiy-storchaka

   added sub-issues on Aug 21, 2026

   • del ssl.SSLContext().keylog_filename crashes #156099
   • del sqlite3.Connection.autocommit crashes #156100
   • PyLong_AsInt32() and friends modify *value when they raise OverflowError #156101
   • segfault after deleting row_factory attr of sqlite3 cursor #152817
   • ctypes: crash when deleting Pointer.contents on the free-threaded build #156124
   • ssl: a failed assignment or deletion of _SSLContext._msg_callback clears the callback #156166
3. serhiy-storchaka

   added 2 commits that reference this issue on Aug 21, 2026

   gh-156106: Add tests for setting and deleting attributes defined in C (…

   cdca502

   [3.14] gh-156106: Add tests for setting and deleting attributes defin…

   ccaacd8
4. serhiy-storchaka

   added sub-issues on Aug 21, 2026

   • Crash when deleting frame.f_trace_opcodes in 3.13 #156189
   • A failed assignment to an attribute defined with PyMemberDef changes its value in 3.13 #156196
5. serhiy-storchaka

   added a commit that references this issue on Aug 21, 2026

   [3.13] gh-156106: Add tests for setting and deleting attributes defin…

   8be8128
6. serhiy-storchaka

   closed this as completedon Aug 31, 2026
7. serhiy-storchaka

   reopened this on Aug 31, 2026
8. serhiy-storchaka

   added a commit that references this issue on Oct 9, 2026

   [3.15] gh-156106: Add tests for setting and deleting attributes defin…

   225018d
9. kevinprimeraquecreo-stack

   added this to Project_VKon Oct 18, 2026
10. github-project-automation

    moved this to Todo in Project_VKon Oct 18, 2026
11. kevinprimeraquecreo-stack

    added this to Project_VKon Oct 18, 2026

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