[issue24583] set.update(): Crash when source set is changed during merging

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

5c3812412b6f caused a refleak.

$ ./python -m test.regrtest -uall -R 3:3 test_set
[1/1] test_set
beginning 6 repetitions
123456
......
test_set leaked [23561, 24961, 23961] references, sum=72483
test_set leaked [785, 787, 787] memory blocks, sum=2359
1 test failed:
    test_set

Proposed patch fixes this.

----------
priority: high -> release blocker
resolution: fixed -> 
status: closed -> open
Added file: http://bugs.python.org/file39952/set_add_entry_leak.patch

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<http://bugs.python.org/issue24583>
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