New issue 2908: Segfault when reading a GraphViz file with Pygraphviz https://bitbucket.org/pypy/pypy/issues/2908/segfault-when-reading-a-graphviz-file-with
Shaun Jackman: I installed Pypy3 6.0.0 and GraphViz 2.40.1 using Linuxbrew `brew install pypy3 graphviz`, and I installed Pygraphviz 1.5 and Networkx 2.2 using `pip_pypy3 install --user pygraphviz networkx`. When I attempt to write a GraphViz file using `networkx.write_dot`, it segafults in `_IO_new_fdopen iofdopen.c:63` called by `_wrap_agwrite` in `_graphviz.pypy3-60-x86_64-linux-gnu.so`. It appears to be dereferencing a null pointer. Here's the backtrace: ``` (gdb) bt #0 _IO_new_fdopen (fd=1, mode=0x0) at iofdopen.c:63 #1 0x00007fc0ef4fb759 in _wrap_agwrite () from /home/sjackman/.local/lib/python3.5/site-packages/pygraphviz/_graphviz.pypy3-60-x86_64-linux-gnu.so #2 0x00007fc0ed183984 in ?? () from /gsc/btl/linuxbrew/Cellar/pypy3/6.0.0/lib/libpypy3-c.so (gdb) x/i $pc => 0x7fc0eb9a67b <_IO_new_fdopen+11>: movzbl (%rsi),%eax (gdb) p/x $rsi $1 = 0x0 ``` This works as expected when using CPython 3.7.0 rather than Pypy3. For my purpose, I have found Pypy3 to be four times faster than CPython. Any thoughts on how to troubleshoot this issue? See also https://github.com/pygraphviz/pygraphviz/issues/177 _______________________________________________ pypy-issue mailing list pypy-issue@python.org https://mail.python.org/mailman/listinfo/pypy-issue
