jak debugować błąd segmentacji pyside w virtualenv?

Question

Buduję aplikację Qt z pyside i mam losowe błędy segmentacji. Zainstalowałem faulthandler i callstack jest jasne, czy uncomplete:

File "/home/lionel/Libs/python/ProcessGraph/process_graph/qtgraph.py", line 247 in itemChange 
    File "/home/lionel/Libs/python/ProcessGraph/process_graph/qtgraph.py", line 268 in mousePressEvent 
    File "/home/lionel/Libs/python/ProcessGraph/process_graph/qtgraph.py", line 87 in mousePressEvent 
    File "main.py", line 219 in main 
    File "main.py", line 223 in <module> 

Wypadek zawsze jest tam (w mousePressEvent), ale nie wiem, co mogę zrobić stamtąd wyjątkiem uruchomienie gdb.

Zainstalowałem python-gdb i próbowałem uruchomić: gdb -ex r --args python-dbg main.py, ale nie działa. Więc utknąłem. Tutaj stos:

python2.7-dbg: ../Objects/object.c:65: _Py_AddToAllObjects: Assertion `(op->_ob_prev == ((void *)0)) == (op->_ob_next == ((void *)0))' failed. 

Program received signal SIGABRT, Aborted. 
0x00007ffff6f09037 in raise() 
    from /lib/x86_64-linux-gnu/libc.so.6 
(gdb) bt 
#0 0x00007ffff6f09037 in raise() 
    from /lib/x86_64-linux-gnu/libc.so.6 
#1 0x00007ffff6f0c698 in abort() 
    from /lib/x86_64-linux-gnu/libc.so.6 
#2 0x00007ffff6f01e03 in ??() 
    from /lib/x86_64-linux-gnu/libc.so.6 
#3 0x00007ffff6f01eb2 in __assert_fail() 
    from /lib/x86_64-linux-gnu/libc.so.6 
#4 0x0000000000488f38 in _Py_AddToAllObjects (
    op=<unknown at remote 0x7ffff578aa20>, force=0) 
    at ../Objects/object.c:65 
#5 0x00000000004bbde5 in PyType_Ready (
    type=0x7ffff578aa20 <SbkEnumType_Type>) 
    at ../Objects/typeobject.c:3985 
#6 0x00007ffff5567e50 in Shiboken::init()() 
    from /usr/lib/x86_64-linux-gnu/libshiboken-python2.7.so.1.1 
#7 0x00007ffff5577b79 in Shiboken::Module::create(char const*, void*)() 
    from /usr/lib/x86_64-linux-gnu/libshiboken-python2.7.so.1.1 
#8 0x00007ffff0c98fb9 in initQtCore() 
    from /usr/lib/python2.7/dist-packages/PySide/QtCore.so 
#9 0x0000000000549771 in _PyImport_LoadDynamicModule 
    (name=0xc37900 "PySide.QtCore", 
    pathname=0xc38930 "/usr/lib/python2.7/dist-packages/PySide/QtCore.so", fp=0xc3a980) 
    at ../Python/importdl.c:53 
#10 0x0000000000545984 in load_module (
    name=0xc37900 "PySide.QtCore", fp=0xc3a980, 
    pathname=0xc38930 "/usr/lib/python2.7/dist-packages/PySide/QtCore.so", type=3, loader=0x0) 
    at ../Python/import.c:1915 
#11 0x0000000000547ade in import_submodule (
    mod=<module at remote 0xbe2af0>, 
    subname=0xc37907 "QtCore", 
    fullname=0xc37900 "PySide.QtCore") 
    at ../Python/import.c:2700 
#12 0x00000000005470ae in load_next (
    mod=<module at remote 0xbe2af0>, 
    altmod=<module at remote 0xbe2af0>, 
    p_name=0x7fffffffcee8, 
    buf=0xc37900 "PySide.QtCore", 
    p_buflen=0x7fffffffcf00) 
    at ../Python/import.c:2515 
#13 0x000000000054632e in import_module_level (
    name=0x0, 
    globals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, 
    locals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, fromlist=['__doc__'], 
    level=0) at ../Python/import.c:2232 
#14 0x0000000000546805 in PyImport_ImportModuleLevel (
    name=0xc86c3c "PySide.QtCore", 
    globals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, 
    locals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, fromlist=['__doc__'], 
    level=0) at ../Python/import.c:2288 
#15 0x000000000051208b in builtin___import__ (
    self=0x0, 
    args=('PySide.QtCore', {'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, {...}, ['__doc__'], 0), kwds=0x0) at ../Python/bltinmodule.c:49 
---Type <return> to continue, or q <return> to quit--- 
#16 0x0000000000487ae4 in PyCFunction_Call (
    func=<built-in function __import__>, 
    arg=('PySide.QtCore', {'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, {...}, ['__doc__'], 0), kw=0x0) at ../Objects/methodobject.c:85 
#17 0x0000000000427737 in PyObject_Call (
    func=<built-in function __import__>, 
    arg=('PySide.QtCore', {'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, {...}, ['__doc__'], 0), kw=0x0) at ../Objects/abstract.c:2529 
#18 0x000000000042788d in call_function_tail (
    callable=<built-in function __import__>, 
    args=('PySide.QtCore', {'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, {...}, ['__doc__'], 0)) at ../Objects/abstract.c:2561 
#19 0x00000000004279f9 in PyObject_CallFunction (
    callable=<built-in function __import__>, 
    format=0x6412f7 "OOOOi") 
    at ../Objects/abstract.c:2585 
#20 0x00000000005483e5 in PyImport_Import (
    module_name='PySide.QtCore') 
    at ../Python/import.c:2886 
#21 0x00000000005460cc in PyImport_ImportModule (
    name=0x7ffff6796c67 "PySide.QtCore") 
    at ../Python/import.c:2129 
#22 0x00007ffff5577b38 in Shiboken::Module::import(char const*)() 
    from /usr/lib/x86_64-linux-gnu/libshiboken-python2.7.so.1.1 
#23 0x00007ffff65a7cd6 in initQtGui() 
    from /usr/lib/python2.7/dist-packages/PySide/QtGui.so 
#24 0x0000000000549771 in _PyImport_LoadDynamicModule 
    (name=0xc209a0 "PySide.QtGui", 
    pathname=0xc235a0 "/usr/lib/python2.7/dist-packages/PySide/QtGui.so", fp=0xc09660) 
    at ../Python/importdl.c:53 
#25 0x0000000000545984 in load_module (
    name=0xc209a0 "PySide.QtGui", fp=0xc09660, 
    pathname=0xc235a0 "/usr/lib/python2.7/dist-packages/PySide/QtGui.so", type=3, loader=0x0) 
    at ../Python/import.c:1915 
#26 0x0000000000547ade in import_submodule (
    mod=<module at remote 0xbe2af0>, 
    subname=0xbe4a94 "QtGui", 
    fullname=0xc209a0 "PySide.QtGui") 
    at ../Python/import.c:2700 
#27 0x000000000054766c in ensure_fromlist (
    mod=<module at remote 0xbe2af0>, 
    fromlist=('QtGui',), buf=0xc209a0 "PySide.QtGui", 
    buflen=6, recursive=0) at ../Python/import.c:2606 
#28 0x000000000054672a in import_module_level (
    name=0x0, 
    globals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, 
    locals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, fromlist=('QtGui',), 
    level=-1) at ../Python/import.c:2269 
#29 0x0000000000546805 in PyImport_ImportModuleLevel (
    name=0xbe4a34 "PySide", 
    globals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, 
    locals={'__builtins__': <module at remote 0x7ffff7f---Type <return> to continue, or q <return> to quit--- 
cd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, fromlist=('QtGui',), 
    level=-1) at ../Python/import.c:2288 
#30 0x000000000051208b in builtin___import__ (
    self=0x0, 
    args=('PySide', {'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, {...}, ('QtGui',)), kwds=0x0) at ../Python/bltinmodule.c:49 
#31 0x0000000000487ae4 in PyCFunction_Call (
    func=<built-in function __import__>, 
    arg=('PySide', {'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, {...}, ('QtGui',)), 
    kw=0x0) at ../Objects/methodobject.c:85 
#32 0x0000000000427737 in PyObject_Call (
    func=<built-in function __import__>, 
    arg=('PySide', {'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, {...}, ('QtGui',)), 
    kw=0x0) at ../Objects/abstract.c:2529 
#33 0x0000000000527948 in PyEval_CallObjectWithKeywords (func=<built-in function __import__>, 
    arg=('PySide', {'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, {...}, ('QtGui',)), 
    kw=0x0) at ../Python/ceval.c:3890 
#34 0x0000000000521c54 in PyEval_EvalFrameEx (
    f=Frame 0xc092f0, for file main.py, line 7, in <module>(), throwflag=0) at ../Python/ceval.c:2333 
#35 0x0000000000525989 in PyEval_EvalCodeEx (
    co=0xbc2510, 
    globals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, 
    locals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, args=0x0, argcount=0, 
    kws=0x0, kwcount=0, defs=0x0, defcount=0, 
    closure=0x0) at ../Python/ceval.c:3253 
#36 0x000000000051b9f6 in PyEval_EvalCode (
    co=0xbc2510, 
    globals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, 
    locals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}) at ../Python/ceval.c:667 
#37 0x000000000055842d in run_mod (mod=0xc1c1a8, 
    filename=0x7fffffffe1a8 "main.py", 
    globals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, 
    locals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, flags=0x7fffffffdc10, 
    arena=0xb7f8a0) at ../Python/pythonrun.c:1365 
#38 0x00000000005583b3 in PyRun_FileExFlags (
    fp=0xc05370, filename=0x7fffffffe1a8 "main.py", 
    start=257, 
    globals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, 
---Type <return> to continue, or q <return> to quit--- 
    locals={'__builtins__': <module at remote 0x7ffff7fcd4d8>, '__file__': 'main.py', '__package__': None, 'sys': <module at remote 0x7ffff7fcd610>, '__name__': '__main__', '__doc__': None}, closeit=1, 
    flags=0x7fffffffdc10) 
    at ../Python/pythonrun.c:1351 
#39 0x0000000000556b70 in PyRun_SimpleFileExFlags (
    fp=0xc05370, filename=0x7fffffffe1a8 "main.py", 
    closeit=1, flags=0x7fffffffdc10) 
    at ../Python/pythonrun.c:943 
#40 0x0000000000556201 in PyRun_AnyFileExFlags (
    fp=0xc05370, filename=0x7fffffffe1a8 "main.py", 
    closeit=1, flags=0x7fffffffdc10) 
    at ../Python/pythonrun.c:747 
#41 0x000000000057203a in Py_Main (argc=2, 
    argv=0x7fffffffde28) at ../Modules/main.c:640 
#42 0x0000000000417edc in main (argc=2, 
    argv=0x7fffffffde28) at ../Modules/python.c:23 

Answer 1

Istnieje sztuczka, musisz uruchomić interpreter języka Python odpowiadający twojemu virtualenv.

Musisz również upewnić się, że używasz kompilacji debugowania w Pythonie.

Oto, jak udało mi się dostać gdb z funkcji Pythona na Ubuntu:

# must use debug build of Python 
sudo apt-get install gdb python2.7-dbg 

# newest kernels disallow tracing/debugging by default (why on earth?)  
echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope 

# create virtualenv with debug Python build 
virtualenv -p /usr/bin/python2.7-dbg ~/labarret 

# start virtualenv  
. ~/labarret/bin/activate 

# pip install your-libs-and-deps 

# now start **system** interpreter that corresponds to virtualenv 
# make sure virtualenv libs/modules are loaded via environment 
PYTHONHOME=~/labarret/ gdb --args /usr/bin/python2.7-dbg your-code.py