New submission from Julien Muchembled: I use pickle over sockets to make 2 processes communicate and I experience hangs when the resulting pickle message is exactly 4097 bytes.
Attached file is a small script reproducing the issue, trying a few values around 4096. It runs on both Python 2.7 & 3.3: - Python 2.7.3: ok (script exits) - Python 3.3.2: last iteration hangs With strace, you can easily see that after reading the 4097 bytes: [pid 17100] read(3, <unfinished ...> [pid 17100] <... read resumed> "\200\2X\367\17\0\0 "..., 4096) = 4096 [pid 17100] read(3, ".", 4096) = 1 it reads again without reason: [pid 17100] read(3, No issue with the Python implementation, that you can try with little change: - Python 2.7.3: ok (from pickle import Unpickler) - Python 3.3.2: ok (from pickle import _Unpickler as Unpickler) ---------- components: Extension Modules files: test_case.py messages: 190149 nosy: jm priority: normal severity: normal status: open title: pickle.Unpickler may read too many bytes, causing hangs with blocking input stream type: behavior versions: Python 3.3 Added file: http://bugs.python.org/file30388/test_case.py _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue18073> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
