Hi! At #13370, I have a debugging problem that seems difficult to me.
There is a segfault when testing sage/rings/polynomial/infinite_polynomial_element.py, but the segfault seems only to occur when I do parallel tests. To be precise: sage -t devel/sage/sage/rings/polynomial/infinite_polynomial_element.py worked repeatedly, perhaps 30 times in a row. But when I do sage -tp 4 devel/sage/sage/rings/polynomial/ the segfault occurs. How can those things be debugged? How can I get a debugger open, or get a core dump? I tried sage -gdb -tp 4 devel/sage/sage/rings/polynomial/ but that didn't work. It eventually opened an interactive sage session, but not without complaining: 'import site' failed; use -v for traceback GNU gdb (GDB) 7.0.1-debian Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/bin/python...done. [Thread debugging using libthread_db enabled] Python 2.7.3 (default, Aug 14 2012, 21:33:59) [GCC 4.6.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. Traceback (most recent call last): File "/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib64/libstdc++.so.6.0.16-gdb.py", line 19, in <module> import os File "/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib/python/os.py", line 398, in <module> import UserDict File "/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib/python/UserDict.py", line 84, in <module> _abcoll.MutableMapping.register(IterableUserDict) File "/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib/python/abc.py", line 109, in register if issubclass(subclass, cls): File "/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib/python/abc.py", line 184, in __subclasscheck__ cls._abc_negative_cache.add(subclass) File "/mnt/local/king/SAGE/prereleases/sage-5.3.beta2/local/lib/python/_weakrefset.py", line 84, in add self.data.add(ref(item, self._remove)) TypeError: cannot create weak reference to 'classobj' object Is sage -gdb using UniqueRepresentation or so? Because I have patches applied that would use weak references to the arguments of a UniqueRepresentation. Cheers, Simon -- -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
