Antoine Pitrou added the comment: The problem is that using an unpickled LZMACompressor crashes:
$ ./python -c "import lzma, pickle; c = pickle.loads(pickle.dumps(lzma.LZMACompressor())); c.compress(b'')" Erreur de segmentation Here is the gdb backtrace: #0 0x00007ffff7bcafc0 in sem_trywait () from /lib/x86_64-linux-gnu/libpthread.so.0 #1 0x0000000000436c15 in PyThread_acquire_lock_timed (lock=0x0, microseconds=0, intr_flag=0) at Python/thread_pthread.h:350 #2 0x0000000000436db8 in PyThread_acquire_lock (lock=0x0, waitflag=0) at Python/thread_pthread.h:556 #3 0x00007ffff64a6538 in Compressor_compress (self=0x7ffff7e129a0, args=0x7ffff7f17468) at /home/antoine/cpython/default/Modules/_lzmamodule.c:533 ---------- nosy: +pitrou stage: -> needs patch title: lzma hangs for a very long time when run in parallel using python's muptiprocessing module? -> unpickled LZMACompressor is crashy type: behavior -> crash versions: +Python 3.4 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue19395> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
