Details
P2: Important Description
I encountered this bug in matplotlib, where moving the mouse over a plot window causes a segfault.
The same bug is described here: http://bugs.pyside.org/show_bug.cgi?id=1119 and here http://bugs.pyside.org/show_bug.cgi?id=1159. In the latter report, a test case is described, which runs fine on 32bit, but segfaults on 64bit. The actual error appears to be triggered by QCursor_Init (both for a matplotlib backtrace, and the minimal example below).
(gdb) run
Starting program: /data/home/nobackup/mhulsman/env_v1.0/sys_enhance/bin/python
warning: no loadable sections found in added symbol-file system-supplied DSO at 0x2aaaaaaab000
[Thread debugging using libthread_db enabled]
Python 2.7 (r27:82500, Mar 8 2012, 21:06:08)
[GCC 4.6.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from PySide.QtCore import *
>>> from PySide.QtGui import *
>>> cursor = QCursor( Qt.BlankCursor )
Program received signal SIGSEGV, Segmentation fault.
0x00002aaaaf38434d in Shiboken::Conversions::isPythonToCppConvertible(SbkConverter*, _object*) () from /data/home/nobackup/mhulsman/env_v1.0/sys_enhance/lib/libshiboken-python2.7.so.1.1
(gdb) bt
#0 0x00002aaaaf38434d in Shiboken::Conversions::isPythonToCppConvertible(SbkConverter*, _object*) ()
from /data/home/nobackup/mhulsman/env_v1.0/sys_enhance/lib/libshiboken-python2.7.so.1.1
#1 0x00002aaab0861b41 in Sbk_QCursor_Init () from /data/home/nobackup/mhulsman/env_v1.0/sys_enhance/lib/python2.7/site-packages/PySide/QtGui.so
#2 0x00002aaaaab56ac8 in type_call (type=<optimized out>, args=0x2aaaaaef77d0, kwds=0x0) at Objects/typeobject.c:725
#3 0x00002aaaaaafa5a3 in PyObject_Call (func=0x2aaab12d7280, arg=<optimized out>, kw=<optimized out>) at Objects/abstract.c:2522
#4 0x00002aaaaab9b5ed in do_call (nk=<optimized out>, na=<optimized out>, pp_stack=0x7fffffffd410, func=0x2aaab12d7280) at Python/ceval.c:4230
#5 call_function (oparg=<optimized out>, pp_stack=0x7fffffffd410) at Python/ceval.c:4035
#6 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:2665
#7 0x00002aaaaab9e595 in PyEval_EvalCodeEx (co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=0, kws=0x0, kwcount=0, defs=0x0,
defcount=0, closure=0x0) at Python/ceval.c:3252
#8 0x00002aaaaab9e6d2 in PyEval_EvalCode (co=<optimized out>, globals=<optimized out>, locals=<optimized out>) at Python/ceval.c:666
#9 0x00002aaaaabc1a32 in run_mod (arena=0x640cb0, flags=0x7fffffffd720, locals=0x640560, globals=0x640560, filename=0x2aaaaac0855f "<stdin>", mod=0x712698) at Python/pythonrun.c:1346
#10 PyRun_InteractiveOneFlags (fp=<optimized out>, filename=0x2aaaaac0855f "<stdin>", flags=0x7fffffffd720) at Python/pythonrun.c:845
#11 0x00002aaaaabc1c6e in PyRun_InteractiveLoopFlags (fp=0x395c3526a0, filename=0x2aaaaac0855f "<stdin>", flags=0x7fffffffd720) at Python/pythonrun.c:765
#12 0x00002aaaaabc221c in PyRun_AnyFileExFlags (fp=0x395c3526a0, filename=0x2aaaaac0855f "<stdin>", closeit=0, flags=0x7fffffffd720) at Python/pythonrun.c:734
#13 0x00002aaaaabd42cb in Py_Main (argc=<optimized out>, argv=<optimized out>) at Modules/main.c:599
#14 0x000000395c01d9b4 in __libc_start_main () from /lib64/libc.so.6
#15 0x0000000000400619 in _start ()