Armin Rigo added the comment: The signal handler is called between the INPLACE_ADD and the following STORE_FAST opcode, never from string_concatenate() itself. A fix would be to make sure signal handlers are not called between these two opcodes. See the minimal, proof-of-concept patch #1. A possibly better fix, which at least should match the SETUP_FINALLY handling in the ticker handler, is attached as patch #2. (Patches against 2.7.13)
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