Author haypo
Recipients Yang Ke, fdrake, guojiahua, haypo, pitrou, xiang.zhang
Date 2016-03-23.07:58:10
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1458719892.4.0.382834033921.issue26617@psf.upfronthosting.co.za>
In-reply-to
Content
Oh, I confirm that the bug occurs on Python 3.5.1+ (3.5 branch) and Python 3.6 (default branch).

Call stack: _Py_Dealloc() => subtype_dealloc() => PyObject_ClearWeakRefs() => handle_callback() of weakref => ... => gc_collect => ... => assertion error

Full gdb tracebacks:

python: Modules/gcmodule.c:364: update_refs: Assertion `((gc)->gc.gc_refs >> (1)) != 0' failed.

Program received signal SIGABRT, Aborted.
0x00007ffff7129a98 in raise () from /lib64/libc.so.6

(gdb) where
#0  0x00007ffff7129a98 in raise () from /lib64/libc.so.6
#1  0x00007ffff712b69a in abort () from /lib64/libc.so.6
#2  0x00007ffff7122227 in __assert_fail_base () from /lib64/libc.so.6
#3  0x00007ffff71222d2 in __assert_fail () from /lib64/libc.so.6
#4  0x0000000000441b74 in update_refs (containers=0x939c60 <generations+64>) at Modules/gcmodule.c:364
#5  0x0000000000442cb1 in collect (generation=2, n_collected=0x7fffffff87f0, n_uncollectable=0x7fffffff87e8, nofail=0) at Modules/gcmodule.c:950
#6  0x00000000004432dd in collect_with_callback (generation=2) at Modules/gcmodule.c:1119
#7  0x00000000004434cb in gc_collect (self=<module at remote 0x7ffff05e2a58>, args=(), kws=0x0) at Modules/gcmodule.c:1213
#8  0x00000000004d5731 in PyCFunction_Call (func=<built-in method collect of module object at remote 0x7ffff05e2a58>, args=(), kwds=0x0)
    at Objects/methodobject.c:98
#9  0x00000000005d0fd3 in call_function (pp_stack=0x7fffffff8a18, oparg=0) at Python/ceval.c:4732
#10 0x00000000005c8cc0 in PyEval_EvalFrameEx (f=Frame 0x7ffff7eaa858, for file crash.py, line 7, in callback (o=<weakref at remote 0x7ffff05eb658>), 
    throwflag=0) at Python/ceval.c:3207
#11 0x00000000005ce4ec in _PyEval_EvalCodeWithName (_co=<code at remote 0x7ffff7e8f340>, 
    globals={'__package__': None, '__name__': '__main__', 'gc': <module at remote 0x7ffff05e2a58>, 'weakref': <module at remote 0x7ffff05cae58>, '__builtins__': <module at remote 0x7ffff7f5fc58>, 'C': <type at remote 0xac3978>, '__doc__': None, '__spec__': None, 'main': <function at remote 0x7ffff05c1788>, 'callback': <function at remote 0x7ffff05c1338>, '__loader__': <SourceFileLoader(name='__main__', path='crash.py') at remote 0x7ffff7e7de28>, '__file__': 'crash.py', '__cached__': None}, locals=0x0, args=0x7ffff05d5b78, argcount=1, kws=0x0, kwcount=0, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name=0x0, qualname=0x0)
    at Python/ceval.c:4045
#12 0x00000000005ce61e in PyEval_EvalCodeEx (_co=<code at remote 0x7ffff7e8f340>, 
    globals={'__package__': None, '__name__': '__main__', 'gc': <module at remote 0x7ffff05e2a58>, 'weakref': <module at remote 0x7ffff05cae58>, '__builtins__': <module at remote 0x7ffff7f5fc58>, 'C': <type at remote 0xac3978>, '__doc__': None, '__spec__': None, 'main': <function at remote 0x7ffff05c1788>, 'callback': <function at remote 0x7ffff05c1338>, '__loader__': <SourceFileLoader(name='__main__', path='crash.py') at remote 0x7ffff7e7de28>, '__file__': 'crash.py', '__cached__': None}, locals=0x0, args=0x7ffff05d5b78, argcount=1, kws=0x0, kwcount=0, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0) at Python/ceval.c:4066
#13 0x0000000000688276 in function_call (func=<function at remote 0x7ffff05c1338>, arg=(<weakref at remote 0x7ffff05eb658>,), kw=0x0)
    at Objects/funcobject.c:604
#14 0x000000000046c4f3 in PyObject_Call (func=<function at remote 0x7ffff05c1338>, arg=(<weakref at remote 0x7ffff05eb658>,), kw=0x0)
    at Objects/abstract.c:2170
#15 0x000000000046d61d in PyObject_CallFunctionObjArgs (callable=<function at remote 0x7ffff05c1338>) at Objects/abstract.c:2450
#16 0x0000000000576063 in handle_callback (ref=0x7ffff05eb658, callback=<function at remote 0x7ffff05c1338>) at Objects/weakrefobject.c:868
#17 0x0000000000576257 in PyObject_ClearWeakRefs (object=<C at remote 0x7ffff05d5ae8>) at Objects/weakrefobject.c:913
#18 0x00000000004f3bee in subtype_dealloc (self=<C at remote 0x7ffff05d5ae8>) at Objects/typeobject.c:1162
#19 0x00000000004dd7d6 in _Py_Dealloc (op=<C at remote 0x7ffff05d5ae8>) at Objects/object.c:1783
(...)

(gdb) py-bt
Traceback (most recent call first):
  Garbage-collecting
  <built-in method collect of module object at remote 0x7ffff05e2a58>
  File "crash.py", line 7, in callback
    gc.collect()
  File "crash.py", line 17, in main
    del c
  File "crash.py", line 20, in <module>
    main()
History
Date User Action Args
2016-03-23 07:58:12hayposetrecipients: + haypo, fdrake, pitrou, xiang.zhang, guojiahua, Yang Ke
2016-03-23 07:58:12hayposetmessageid: <1458719892.4.0.382834033921.issue26617@psf.upfronthosting.co.za>
2016-03-23 07:58:12haypolinkissue26617 messages
2016-03-23 07:58:10haypocreate