CPU will sit a 100% indefinitely, this is also pretty tough (takes several hours) to reproduce
if you step through the program it is stuck between 290 and 292
Modules/gcmodule.c:
/* Set all gc_refs = ob_refcnt. After this, gc_refs is > 0 for all objects
* in containers, and is GC_REACHABLE for all tracked gc objects not in
* containers.
*/
static void
update_refs(PyGC_Head *containers)
{
PyGC_Head *gc = containers->gc.gc_next;
for (; gc != containers; gc = gc->gc.gc_next) { <-- line 290
assert(gc->gc.gc_refs == GC_REACHABLE);
gc->gc.gc_refs = Py_REFCNT(FROM_GC(gc)); <-- line 292
/* Python's cyclic gc should never see an incoming refcount
* of 0: if something decref'ed to 0, it should have been
* deallocated immediately at that time.
* Possible cause (if the assert triggers): a tp_dealloc
* routine left a gc-aware object tracked during its teardown
* phase, and did something-- or allowed something to happen --
* that called back into Python. gc can trigger then, and may
* see the still-tracked dying object. Before this assert
* was added, such mistakes went on to allow gc to try to
* delete the object again. In a debug build, that caused
* a mysterious segfault, when _Py_ForgetReference tried
* to remove the object from the doubly-linked list of all
* objects a second time. In a release build, an actual
* double deallocation occurred, which leads to corruption
* of the allocator's internal bookkeeping pointers. That's
* so serious that maybe this should be a release-build
* check instead of an assert?
*/
assert(gc->gc.gc_refs != 0);
}
}
GDB backtrace:
#0 0xb7750fcb in update_refs (generation=2) at Modules/gcmodule.c:290
#1 collect (generation=2) at Modules/gcmodule.c:873
#2 0xb77515e3 in collect_generations (basicsize=20) at Modules/gcmodule.c:996
#3 _PyObject_GC_Malloc (basicsize=20) at Modules/gcmodule.c:1457
#4 0xb775163e in _PyObject_GC_NewVar (tp=0xb77a0640, nitems=2) at Modules/gcmodule.c:1477
#5 0xb76df4b7 in PyTuple_New (size=2) at Objects/tupleobject.c:90
#6 0xb77230fd in PyEval_EvalFrameEx (f=
Frame 0x889acdc, for file /usr/lib/python2.7/site-packages/twisted/python/failure.py, line 443, in __getstate__ (self=<Failure(count=3460, tb=<traceback at remote 0x9884fa4>, value=exceptions.AttributeError("DeferredList instance has no attribute 'resultList'",), parents=['exceptions.AttributeError', 'exceptions.StandardError', 'exceptions.Exception', 'exceptions.BaseException', '__builtin__.object', 'exceptions.AttributeError'], frames=[['_runCallbacks', '/usr/lib/python2.7/site-packages/twisted/internet/defer.py', 542, [('chain', [<Deferred(_chainedTo=None, called=True, _canceller=None, callbacks=[], result=<...>, _runningCallbacks=False) at remote 0x9f1cb2c>]), ('callback', <instancemethod at remote 0x9dbf98c>), ('self', <...>), ('args', (1, True)), ('current', <...>), ('item', ((<instancemethod at remote 0x9dbf98c>, (...), None), (<instancemethod at remote 0x9f1e11c>, (1, False), None))), ('finished', True), ('kw', {})], [('AlreadyCalledError', <type at remote 0x885dd6c>), ('DeferredFilesystemLock', <type...(truncated), throwflag=0) at Python/ceval.c:2178
#7 0xb772489a in fast_function (f=
Frame 0x889ab84, for file /usr/lib/python2.7/site-packages/twisted/python/failure.py, line 452, in cleanFailure (self=<Failure(count=3460, tb=<traceback at remote 0x9884fa4>, value=exceptions.AttributeError("DeferredList instance has no attribute 'resultList'",), parents=['exceptions.AttributeError', 'exceptions.StandardError', 'exceptions.Exception', 'exceptions.BaseException', '__builtin__.object', 'exceptions.AttributeError'], frames=[['_runCallbacks', '/usr/lib/python2.7/site-packages/twisted/internet/defer.py', 542, [('chain', [<Deferred(_chainedTo=None, called=True, _canceller=None, callbacks=[], result=<...>, _runningCallbacks=False) at remote 0x9f1cb2c>]), ('callback', <instancemethod at remote 0x9dbf98c>), ('self', <...>), ('args', (1, True)), ('current', <...>), ('item', ((<instancemethod at remote 0x9dbf98c>, (...), None), (<instancemethod at remote 0x9f1e11c>, (1, False), None))), ('finished', True), ('kw', {})], [('AlreadyCalledError', <type at remote 0x885dd6c>), ('DeferredFilesystemLock', <type...(truncated), throwflag=0) at Python/ceval.c:4099
#8 call_function (f=
Frame 0x889ab84, for file /usr/lib/python2.7/site-packages/twisted/python/failure.py, line 452, in cleanFailure (self=<Failure(count=3460, tb=<traceback at remote 0x9884fa4>, value=exceptions.AttributeError("DeferredList instance has no attribute 'resultList'",), parents=['exceptions.AttributeError', 'exceptions.StandardError', 'exceptions.Exception', 'exceptions.BaseException', '__builtin__.object', 'exceptions.AttributeError'], frames=[['_runCallbacks', '/usr/lib/python2.7/site-packages/twisted/internet/defer.py', 542, [('chain', [<Deferred(_chainedTo=None, called=True, _canceller=None, callbacks=[], result=<...>, _runningCallbacks=False) at remote 0x9f1cb2c>]), ('callback', <instancemethod at remote 0x9dbf98c>), ('self', <...>), ('args', (1, True)), ('current', <...>), ('item', ((<instancemethod at remote 0x9dbf98c>, (...), None), (<instancemethod at remote 0x9f1e11c>, (1, False), None))), ('finished', True), ('kw', {})], [('AlreadyCalledError', <type at remote 0x885dd6c>), ('DeferredFilesystemLock', <type...(truncated), throwflag=0) at Python/ceval.c:4034
#9 PyEval_EvalFrameEx (f=
Frame 0x889ab84, for file /usr/lib/python2.7/site-packages/twisted/python/failure.py, line 452, in cleanFailure (self=<Failure(count=3460, tb=<traceback at remote 0x9884fa4>, value=exceptions.AttributeError("DeferredList instance has no attribute 'resultList'",), parents=['exceptions.AttributeError', 'exceptions.StandardError', 'exceptions.Exception', 'exceptions.BaseException', '__builtin__.object', 'exceptions.AttributeError'], frames=[['_runCallbacks', '/usr/lib/python2.7/site-packages/twisted/internet/defer.py', 542, [('chain', [<Deferred(_chainedTo=None, called=True, _canceller=None, callbacks=[], result=<...>, _runningCallbacks=False) at remote 0x9f1cb2c>]), ('callback', <instancemethod at remote 0x9dbf98c>), ('self', <...>), ('args', (1, True)), ('current', <...>), ('item', ((<instancemethod at remote 0x9dbf98c>, (...), None), (<instancemethod at remote 0x9f1e11c>, (1, False), None))), ('finished', True), ('kw', {})], [('AlreadyCalledError', <type at remote 0x885dd6c>), ('DeferredFilesystemLock', <type...(truncated), throwflag=0) at Python/ceval.c:2666
#10 0xb772489a in fast_function (f=
Frame 0x9e4fea4, for file /usr/lib/python2.7/site-packages/twisted/internet/defer.py, line 578, in _runCallbacks (self=<Deferred(_chainedTo=None, called=True, _canceller=None, callbacks=[], result=<Failure(count=3460, tb=<traceback at remote 0x9884fa4>, value=exceptions.AttributeError("DeferredList instance has no attribute 'resultList'",), parents=['exceptions.AttributeError', 'exceptions.StandardError', 'exceptions.Exception', 'exceptions.BaseException', '__builtin__.object', 'exceptions.AttributeError'], frames=[['_runCallbacks', '/usr/lib/python2.7/site-packages/twisted/internet/defer.py', 542, [('chain', [<...>]), ('callback', <instancemethod at remote 0x9dbf98c>), ('self', <...>), ('args', (1, True)), ('current', <...>), ('item', ((<instancemethod at remote 0x9dbf98c>, (...), None), (<instancemethod at remote 0x9f1e11c>, (1, False), None))), ('finished', True), ('kw', {})], [('AlreadyCalledError', <type at remote 0x885dd6c>), ('DeferredFilesystemLock', <type at remote 0x8860f54>), ('DebugInfo', <classob...(truncated), throwflag=0) at Python/ceval.c:4099
#11 call_function (f=
Frame 0x9e4fea4, for file /usr/lib/python2.7/site-packages/twisted/internet/defer.py, line 578, in _runCallbacks (self=<Deferred(_chainedTo=None, called=True, _canceller=None, callbacks=[], result=<Failure(count=3460, tb=<traceback at remote 0x9884fa4>, value=exceptions.AttributeError("DeferredList instance has no attribute 'resultList'",), parents=['exceptions.AttributeError', 'exceptions.StandardError', 'exceptions.Exception', 'exceptions.BaseException', '__builtin__.object', 'exceptions.AttributeError'], frames=[['_runCallbacks', '/usr/lib/python2.7/site-packages---Type <return> to continue, or q <return> to quit---
/twisted/internet/defer.py', 542, [('chain', [<...>]), ('callback', <instancemethod at remote 0x9dbf98c>), ('self', <...>), ('args', (1, True)), ('current', <...>), ('item', ((<instancemethod at remote 0x9dbf98c>, (...), None), (<instancemethod at remote 0x9f1e11c>, (1, False), None))), ('finished', True), ('kw', {})], [('AlreadyCalledError', <type at remote 0x885dd6c>), ('DeferredFilesystemLock', <type at remote 0x8860f54>), ('DebugInfo', <classob...(truncated), throwflag=0) at Python/ceval.c:4034
#12 PyEval_EvalFrameEx (f=
Frame 0x9e4fea4, for file /usr/lib/python2.7/site-packages/twisted/internet/defer.py, line 578, in _runCallbacks (self=<Deferred(_chainedTo=None, called=True, _canceller=None, callbacks=[], result=<Failure(count=3460, tb=<traceback at remote 0x9884fa4>, value=exceptions.AttributeError("DeferredList instance has no attribute 'resultList'",), parents=['exceptions.AttributeError', 'exceptions.StandardError', 'exceptions.Exception', 'exceptions.BaseException', '__builtin__.object', 'exceptions.AttributeError'], frames=[['_runCallbacks', '/usr/lib/python2.7/site-packages/twisted/internet/defer.py', 542, [('chain', [<...>]), ('callback', <instancemethod at remote 0x9dbf98c>), ('self', <...>), ('args', (1, True)), ('current', <...>), ('item', ((<instancemethod at remote 0x9dbf98c>, (...), None), (<instancemethod at remote 0x9f1e11c>, (1, False), None))), ('finished', True), ('kw', {})], [('AlreadyCalledError', <type at remote 0x885dd6c>), ('DeferredFilesystemLock', <type at remote 0x8860f54>), ('DebugInfo', <classob...(truncated), throwflag=0) at Python/ceval.c:2666
#13 0xb772489a in fast_function (f=
Frame 0x9b745cc, for file /usr/lib/python2.7/site-packages/twisted/internet/defer.py, line 455, in _startRunCallbacks (self=<Deferred(_chainedTo=None, called=True, _canceller=None, callbacks=[], result=<Failure(count=3460, tb=<traceback at remote 0x9884fa4>, value=exceptions.AttributeError("DeferredList instance has no attribute 'resultList'",), parents=['exceptions.AttributeError', 'exceptions.StandardError', 'exceptions.Exception', 'exceptions.BaseException', '__builtin__.object', 'exceptions.AttributeError'], frames=[['_runCallbacks', '/usr/lib/python2.7/site-packages/twisted/internet/defer.py', 542, [('chain', [<...>]), ('callback', <instancemethod at remote 0x9dbf98c>), ('self', <...>), ('args', (1, True)), ('current', <...>), ('item', ((<instancemethod at remote 0x9dbf98c>, (...), None), (<instancemethod at remote 0x9f1e11c>, (1, False), None))), ('finished', True), ('kw', {})], [('AlreadyCalledError', <type at remote 0x885dd6c>), ('DeferredFilesystemLock', <type at remote 0x8860f54>), ('DebugInfo', <cl...(truncated), throwflag=0) at Python/ceval.c:4099
#14 call_function (f=
Frame 0x9b745cc, for file /usr/lib/python2.7/site-packages/twisted/internet/defer.py, line 455, in _startRunCallbacks (self=<Deferred(_chainedTo=None, called=True, _canceller=None, callbacks=[], result=<Failure(count=3460, tb=<traceback at remote 0x9884fa4>, value=exceptions.AttributeError("DeferredList instance has no attribute 'resultList'",), parents=['exceptions.AttributeError', 'exceptions.StandardError', 'exceptions.Exception', 'exceptions.BaseException', '__builtin__.object', 'exceptions.AttributeError'], frames=[['_runCallbacks', '/usr/lib/python2.7/site-packages/twisted/internet/defer.py', 542, [('chain', [<...>]), ('callback', <instancemethod at remote 0x9dbf98c>), ('self', <...>), ('args', (1, True)), ('current', <...>), ('item', ((<instancemethod at remote 0x9dbf98c>, (...), None), (<instancemethod at remote 0x9f1e11c>, (1, False), None))), ('finished', True), ('kw', {})], [('AlreadyCalledError', <type at remote 0x885dd6c>), ('DeferredFilesystemLock', <type at remote 0x8860f54>), ('DebugInfo', <cl...(truncated), throwflag=0) at Python/ceval.c:4034
#15 PyEval_EvalFrameEx (f=
Frame 0x9b745cc, for file /usr/lib/python2.7/site-packages/twisted/internet/defer.py, line 455, in _startRunCallbacks (self=<Deferred(_chainedTo=None, called=True, _canceller=None, callbacks=[], result=<Failure(count=3460, tb=<traceback at remote 0x9884fa4>, value=exceptions.AttributeError("DeferredList instance has no attribute 'resultList'",), parents=['exceptions.AttributeError', 'exceptions.StandardError', 'exceptions.Exception', 'exceptions.BaseException', '__builtin__.object', 'exceptions.AttributeError'], frames=[['_runCallbacks', '/usr/lib/python2.7/site-packages/twisted/internet/defer.py', 542, [('chain', [<...>]), ('callback', <instancemethod at remote 0x9dbf98c>), ('self', <...>), ('args', (1, True)), ('current', <...>), ('item', ((<instancemethod at remote 0x9dbf98c>, (...), None), (<instancemethod at remote 0x9f1e11c>, (1, False), None))), ('finished', True), ('kw', {})], [('AlreadyCalledError', <type at remote 0x885dd6c>), ('DeferredFilesystemLock', <type at remote 0x8860f54>), ('DebugInfo', <cl...(truncated), throwflag=0) at Python/ceval.c:2666
#16 0xb772489a in fast_function (f=
Frame 0x9ee4c04, for file /usr/lib/python2.7/site-packages/twisted/internet/defer.py, line 361, in callback (self=<Deferred(_chainedTo=None, called=True, _canceller=None, callbacks=[], result=<Failure(count=3460, tb=<traceback at remote 0x9884fa4>, value=exceptions.AttributeError("DeferredList instance has no attribute 'resultList'",), parents=['exceptions.AttributeError', 'exceptions.StandardError', 'exceptions.Exception', 'exceptions.BaseException', '__builtin__.object', 'exceptions.AttributeError'], frames=[['_runCallbacks', '/usr/lib/python2.7/site-packages/twisted/internet/defer.py', 542, [('chain', [<...>]), ('callback', <instancemethod at remote 0x9dbf98c>), ('self', <...>), ('args', (1, True)), ('current', <...>), ('item', ((<instancemethod at remote 0x9dbf98c>, (...), None), (<instancemethod at remote 0x9f1e11c>, (1, False), None))), ('finished', True), ('kw', {})], [('AlreadyCalledError', <type at remote 0x885dd6c>), ('DeferredFilesystemLock', <type at remote 0x8860f54>), ('DebugInfo', <classobj at ...(truncated), throwflag=0) at Python/ceval.c:4099
#17 call_function (f=
Frame 0x9ee4c04, for file /usr/lib/python2.7/site-packages/twisted/internet/defer.py, line 361, in callback (self=<Deferred(_chainedTo=None, called=True, _canceller=None, callbacks=[], result=<Failure(count=3460, tb=<traceback at remote 0x9884fa4>, value=exceptions.AttributeError("DeferredList instance has no attribute 'resultList'",), parents=['exceptions.AttributeError', 'exceptions.StandardError', 'exceptions.Exception', 'exceptions.BaseException', '__builtin__.object', 'exceptions.AttributeError'], frames=[['_runCallbacks', '/usr/lib/python2.7/site-packages/twisted/internet/defer.py', 542, [('chain', [<...>]), ('callback', <instancemethod at remote 0x9dbf98c>), ('self', <...>), ('args', (1, True)), ('current', <...>), ('item', ((<instancemethod at remote 0x9dbf98c>, (...), None), (<instancemethod at remote 0x9f1e11c>, (1, False), None))), ('finished', True), ('kw', {})], [('AlreadyCalledError', <type at remote 0x885dd6c>), ('DeferredFilesystemLock', <type at remote 0x8860f54>), ('DebugInfo', <classobj at ...(truncated), throwflag=0) at Python/ceval.c:4034 |