[issue28812] Deadlock between GIL and pystate head_mutex.

[Eric Snow]

Change by Eric Snow :


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nosy: +eric.snow

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[issue28812] Deadlock between GIL and pystate head_mutex.

[INADA Naoki]

INADA Naoki added the comment:

#30395 is about forking, but this is about multi threading.

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[issue28812] Deadlock between GIL and pystate head_mutex.

[Pádraig Brady]

Pádraig Brady added the comment:

This can probably closed as a dupe of #30395

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[issue28812] Deadlock between GIL and pystate head_mutex.

[INADA Naoki]

New submission from INADA Naoki:

While investigating #28673, I found another deadlock relating to finalization 
and threading.

deadlocked thread (holding gil / waiting head_mutex):
#0  0x7f35dd400a07 in futex_abstimed_wait_cancelable (private=0, 
abstime=0x0, expected=0, futex_word=0x5557e6d3eeb0) at 
../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x5557e6d3eeb0, abstime=0x0) at 
sem_waitcommon.c:111
#2  0x7f35dd400ab4 in __new_sem_wait_slow (sem=0x5557e6d3eeb0, abstime=0x0) 
at sem_waitcommon.c:181
#3  0x7f35dd400b5a in __new_sem_wait (sem=sem@entry=0x5557e6d3eeb0) at 
sem_wait.c:29
#4  0x5557e64ec01b in PyThread_acquire_lock_timed (lock=0x5557e6d3eeb0, 
microseconds=-1, intr_flag=intr_flag@entry=0) at Python/thread_pthread.h:352
#5  0x5557e64ec148 in PyThread_acquire_lock (lock=, 
waitflag=waitflag@entry=1) at Python/thread_pthread.h:556
#6  0x5557e64d8dbb in tstate_delete_common 
(tstate=tstate@entry=0x7f35cc002a80) at Python/pystate.c:426
#7  0x5557e64d9e8d in PyThreadState_DeleteCurrent () at Python/pystate.c:462
#8  0x5557e662d339 in t_bootstrap (boot_raw=0x7f35dc186628) at 
./Modules/_threadmodule.c:1027
#9  0x7f35dd3f870a in start_thread (arg=0x7f35c3fff700) at 
pthread_create.c:333
#10 0x7f35dca220af in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:105

main thread (waiting gil / holding head_mutex):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at 
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x5557e65f1758 in PyCOND_TIMEDWAIT (us=5000, mut=0x5557e69cc860 
, cond=0x5557e69cc8a0 ) at Python/condvar.h:103
#2  take_gil (tstate=tstate@entry=0x5557e6d3f840) at Python/ceval_gil.h:224
#3  0x5557e65f3b14 in _PyEval_EvalFrameDefault (f=Frame 0x7f35d0001878, for 
file finish-deadlock.py, line 7, in __del__ (self=), throwflag=)
at Python/ceval.c:1140
#4  0x5557e65f1dcf in PyEval_EvalFrameEx (f=f@entry=Frame 0x7f35d0001878, 
for file finish-deadlock.py, line 7, in __del__ (self=), throwflag=throwflag@entry=0)
at Python/ceval.c:718
#5  0x5557e65f1eab in _PyFunction_FastCall (co=co@entry=0x7f35dc50eac0, 
args=0x7fff1a1e2878, args@entry=0x7fff1a1e2870, nargs=nargs@entry=1, 
globals=globals@entry={'__name__': '__main__', '__doc__': None, 
'__package__': None, '__loader__': , '__spec__': None, 
'__annotations__': {}, '__builtins__': , 
'__cached__': None, 'sys': , 'time': , 'threading': , 'C': 
, 'worker': , 
'_': 4, 't': , 
_name='Thread-11', _args=(), _kwargs={}, _daemonic=True, 
_ident=139869249451776, _tstate_lock=<_thread.lock at remote 0x7f35dc4739e0>, 
_started=, 
acquire=, release=, _waiters=) at remote 0x7f35dc191538>,...(truncated)) at 
Python/ceval.c:4881
#6  0x5557e65feb04 in _PyFunction_FastCallDict (func=func@entry=, args=args@entry=0x7fff1a1e2870, nargs=nargs@entry=1, 
kwargs=kwargs@entry=0x0)
at Python/ceval.c:4983
#7  0x5557e6500386 in _PyObject_FastCallDict (func=func@entry=, args=args@entry=0x7fff1a1e2870, nargs=nargs@entry=1, 
kwargs=kwargs@entry=0x0)
at Objects/abstract.c:2301
#8  0x5557e6500644 in _PyObject_Call_Prepend (func=, obj=obj@entry=, 
args=args@entry=(), kwargs=kwargs@entry=0x0)
at Objects/abstract.c:2364
#9  0x5557e651c2e4 in method_call (method=method@entry=, args=args@entry=(), kwargs=kwargs@entry=0x0) at 
Objects/classobject.c:317
#10 0x5557e6500247 in _PyObject_FastCallDict (func=func@entry=, args=args@entry=0x0, nargs=nargs@entry=0, 
kwargs=kwargs@entry=0x0) at Objects/abstract.c:2322
#11 0x5557e65f34a2 in PyEval_CallObjectWithKeywords 
(func=func@entry=, args=args@entry=0x0, 
kwargs=kwargs@entry=0x0) at Python/ceval.c:4705
#12 0x5557e6577f0d in slot_tp_finalize (self=) at 
Objects/typeobject.c:6416
#13 0x5557e655a07c in PyObject_CallFinalizer (self=self@entry=) at Objects/object.c:297
#14 0x5557e655adb7 in PyObject_CallFinalizerFromDealloc (self=self@entry=) at Objects/object.c:314
#15 0x5557e656cfde in subtype_dealloc (self=self@entry=) at Objects/typeobject.c:1151
#16 0x5557e655ae75 in _Py_Dealloc (op=) at 
Objects/object.c:1786
#17 0x5557e65312c5 in frame_dealloc (f=f@entry=Frame 0x7f35c40026a8, for 
file finish-deadlock.py, line 22, in worker ()) at Objects/frameobject.c:423
#18 0x5557e655ae75 in _Py_Dealloc (op=Frame 0x7f35c40026a8, for file 
finish-deadlock.py, line 22, in worker ()) at Objects/object.c:1786
#19 0x5557e64e88c1 in tb_dealloc (tb=tb@entry=0x7f35dc193f38) at 
Python/traceback.c:55
#20 0x5557e655ae75 in _Py_Dealloc (op=) 
at Objects/object.c:1786
#21 0x5557e64d98f3 in PyThreadState_Clear 
(tstate=tstate@entry=0x5557e6e307f0) at Python/pystate.c:403
#22 0x5557e64d99cf in PyInterpreterState_Clear 
(interp=interp@entry=0x5557e6d3f390) at Python/pystate.c:119
#23 0x5557e64d7b0f in Py_FinalizeEx () at Python/pylifecycle.c:672
#24 0x5557e64eed2f in Py_Main (argc=2, argv=0x5557e6d3e010) at 
Modules/main.c:800
#25 0x5557e64d3ad5 in main (argc=