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Need to defer GC tracking of frozenset/set construction #152235
Description
The same bug affects frozenset/set: construction GC-tracks the object before it's filled, so another thread can reach a half-built frozenset via gc.get_objects() mid-construction. ThreadSanitizer confirms it:
WARNING: ThreadSanitizer: data race (pid=78348) SUMMARY: ThreadSanitizer: data race setobject.c:320 in set_add_entry_takeref WARNING: ThreadSanitizer: data race (pid=78348) SUMMARY: ThreadSanitizer: data race setobject.c:321 in set_add_entry_takeref WARNING: ThreadSanitizer: data race (pid=78348) SUMMARY: ThreadSanitizer: data race setobject.c:323 in set_add_entry_takeref WARNING: ThreadSanitizer: data race (pid=78348) SUMMARY: ThreadSanitizer: data race setobject.c:537 in set_table_resize SUMMARY: ThreadSanitizer: SEGV setobject.c:816 in set_repr
I am working on this
Linked PRs
- gh-152235: Defer GC tracking of set and frozenset to end of construction #152237
- [3.15] gh-152235: Defer GC tracking of set and frozenset to end of construction (gh-152237) #152242
- [3.14] gh-152235: Defer GC tracking of set and frozenset to end of construction (gh-152237) #152243
- [3.13] gh-152235: Defer GC tracking of set and frozenset to end of construction #152272
- gh-152235: Defer GC tracking in more set operations #152273
- [3.15] gh-152235: Defer GC tracking in more set operations (gh-152273) #152278
- [3.14] gh-152235: Defer GC tracking in more set operations (gh-152273) #152279
- [3.13] gh-152235: Defer GC tracking in more set operations (gh-152273) #152280
- gh-152235: Defer GC tracking in set.union and set.difference #152290
- [3.14] gh-152235: Defer GC tracking in set.union and set.difference (gh-152290) #152312
- [3.15] gh-152235: Defer GC tracking in set.union and set.difference (gh-152290) #152316
- [3.13] gh-152235: Defer GC tracking in set.union and set.difference (gh-152290) #152319
- gh-152235: Defer GC tracking during the lock-free fill in set.__init__ #153079
Activity
gh-152235: Defer GC tracking of set and frozenset to end of construct…
[3.14] gh-152235: Defer GC tracking of set and frozenset to end of co…
corona10 commented on Jun 26, 2026
More stuff still left, I am working on it.
[3.15] gh-152235: Defer GC tracking of set and frozenset to end of co…
[3.13] gh-152235: Defer GC tracking of set and frozenset to end of co…
pythongh-152235: Defer GC tracking in more set operations
gh-152235: Defer GC tracking in more set operations (gh-152273)
[3.15] gh-152235: Defer GC tracking in more set operations (gh-152273) (
[3.14] gh-152235: Defer GC tracking in more set operations (gh-152273) (
pythongh-152235: Defer GC tracking in set.union and set.difference
[3.13] gh-152235: Defer GC tracking in more set operations (gh-152273) (
gh-152235: Defer GC tracking in set.union and set.difference (gh-152290)
[3.14] gh-152235: Defer GC tracking in set.union and set.difference (g…
[3.13] gh-152235: Defer GC tracking in set.union and set.difference (g…
[3.15] gh-152235: Defer GC tracking in set.union and set.difference (g…