Serhiy Storchaka added the comment: This was not a problem before 3.5 since IgnoreHandler and DefaultHandler were singletons exposed in the signal module as SIG_DFL and SIG_IGN. But in issue21076 they were converted to enums. This involves converting between enums and ints. All works only while SIG_DFL and SIG_IGN are small integers and there is small integer cache. I proposed either revert this change (signal_no_enum_handlers.patch in issue21076) or even make SIG_DFL and SIG_IGN non-integer singletons (issue23325).
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