Thread 3 (Thread 0x7f398da1e700 (LWP 13159)):
#0  0x00007f3991b87556 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7f3980001f20) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x7f3980001f20, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007f3991b87604 in __new_sem_wait_slow (sem=0x7f3980001f20, abstime=0x0) at sem_waitcommon.c:181
#3  0x00007f3991b87699 in __new_sem_wait (sem=sem@entry=0x7f3980001f20) at sem_wait.c:29
#4  0x000055f8b7423f58 in PyThread_acquire_lock_timed (lock=lock@entry=0x7f3980001f20, microseconds=microseconds@entry=-1000000, intr_flag=intr_flag@entry=1) at Python/thread_pthread.h:372
#5  0x000055f8b746d8ba in acquire_timed (timeout=-1000000000, lock=0x7f3980001f20) at ./Modules/_threadmodule.c:61
#6  lock_PyThread_acquire_lock (self=0x7f398f6045a8, args=<optimized out>, kwds=<optimized out>) at ./Modules/_threadmodule.c:144
#7  0x000055f8b732603a in _PyMethodDef_RawFastCallKeywords (method=0x55f8b77ccc20 <lock_methods+32>, self=self@entry=0x7f398f6045a8, args=args@entry=0x7f39880025b8, nargs=nargs@entry=0, kwnames=kwnames@entry=0x0) at Objects/call.c:690
#8  0x000055f8b74ad839 in _PyMethodDescr_FastCallKeywords (descrobj=descrobj@entry=0x7f3991f08360, args=args@entry=0x7f39880025b0, nargs=nargs@entry=1, kwnames=kwnames@entry=0x0) at Objects/descrobject.c:288
#9  0x000055f8b731208e in call_function (kwnames=0x0, oparg=1, pp_stack=<synthetic pointer>) at Python/ceval.c:4593
#10 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3110
#11 0x000055f8b73dd7b8 in PyEval_EvalFrameEx (throwflag=0, f=0x7f3988002418) at Python/ceval.c:547
#12 _PyEval_EvalCodeWithName (_co=0x7f3990da6300, globals=<optimized out>, locals=locals@entry=0x0, args=<optimized out>, argcount=1, kwnames=0x0, kwargs=0x7f3980000f50, kwcount=0, kwstep=1, defs=0x7f3990d9dae0, defcount=1, kwdefs=0x0, closure=0x0, name=0x7f3991eb5f48, qualname=0x7f3990da42f0) at Python/ceval.c:3930
#13 0x000055f8b7325bb6 in _PyFunction_FastCallKeywords (func=<optimized out>, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at Objects/call.c:433
#14 0x000055f8b73115c1 in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#15 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3124
#16 0x000055f8b7309728 in function_code_fastcall (co=co@entry=0x7f3990b396f0, args=<optimized out>, args@entry=0x7f3991e21220, nargs=nargs@entry=8, globals=globals@entry=0x7f3990d55ab0) at Objects/call.c:283
#17 0x000055f8b7325af6 in _PyFunction_FastCallDict (func=0x7f398da1f8c8, args=0x7f3991e21220, nargs=8, kwargs=0x7f398da3b510) at Objects/call.c:322
#18 0x000055f8b730cf90 in do_call_core (kwdict=0x7f398da3b510, callargs=0x7f3991e21208, func=0x7f398da1f8c8) at Python/ceval.c:4645
#19 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3191
#20 0x000055f8b7309728 in function_code_fastcall (co=<optimized out>, args=<optimized out>, nargs=1, globals=<optimized out>) at Objects/call.c:283
#21 0x000055f8b7325c8f in _PyFunction_FastCallKeywords (func=<optimized out>, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at Objects/call.c:415
#22 0x000055f8b731287b in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#23 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3110
#24 0x000055f8b7309728 in function_code_fastcall (co=<optimized out>, args=<optimized out>, nargs=1, globals=<optimized out>) at Objects/call.c:283
#25 0x000055f8b7325c8f in _PyFunction_FastCallKeywords (func=<optimized out>, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at Objects/call.c:415
#26 0x000055f8b731287b in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#27 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3110
#28 0x000055f8b7309728 in function_code_fastcall (co=co@entry=0x7f3990da8b70, args=<optimized out>, args@entry=0x7f398da1de60, nargs=nargs@entry=1, globals=globals@entry=0x7f3990d8fdc8) at Objects/call.c:283
#29 0x000055f8b7325af6 in _PyFunction_FastCallDict (func=func@entry=0x7f3990db7048, args=args@entry=0x7f398da1de60, nargs=nargs@entry=1, kwargs=kwargs@entry=0x0) at Objects/call.c:322
#30 0x000055f8b7328b01 in _PyObject_FastCallDict (kwargs=0x0, nargs=1, args=0x7f398da1de60, callable=0x7f3990db7048) at Objects/call.c:98
#31 _PyObject_Call_Prepend (callable=0x7f3990db7048, obj=<optimized out>, args=0x7f3991f0b048, kwargs=0x0) at Objects/call.c:904
#32 0x000055f8b7326fba in PyObject_Call (callable=0x7f3991dd9f08, args=<optimized out>, kwargs=<optimized out>) at Objects/call.c:245
#33 0x000055f8b746c493 in t_bootstrap (boot_raw=boot_raw@entry=0x7f398f604620) at ./Modules/_threadmodule.c:994
#34 0x000055f8b7423b57 in pythread_wrapper (arg=<optimized out>) at Python/thread_pthread.h:174
#35 0x00007f3991b7f4a4 in start_thread (arg=0x7f398da1e700) at pthread_create.c:456
#36 0x00007f39911b6d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 2 (Thread 0x7f398d01d700 (LWP 13158)):
#0  0x00007f39911ad8bd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f399006a420 in poll_poll (self=0x7f398f5f1930, args=<optimized out>) at /home/jwilk/src/cpython/Modules/selectmodule.c:590
#2  0x000055f8b7326008 in _PyMethodDef_RawFastCallKeywords (method=0x7f399026e340 <poll_methods+96>, self=self@entry=0x7f398f5f1930, args=args@entry=0x7f39880018d0, nargs=nargs@entry=1, kwnames=kwnames@entry=0x0) at Objects/call.c:694
#3  0x000055f8b74ad839 in _PyMethodDescr_FastCallKeywords (descrobj=descrobj@entry=0x7f3990b3bee8, args=args@entry=0x7f39880018c8, nargs=nargs@entry=2, kwnames=kwnames@entry=0x0) at Objects/descrobject.c:288
#4  0x000055f8b731208e in call_function (kwnames=0x0, oparg=2, pp_stack=<synthetic pointer>) at Python/ceval.c:4593
#5  _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3110
#6  0x000055f8b73dd7b8 in PyEval_EvalFrameEx (throwflag=0, f=0x7f3988001718) at Python/ceval.c:547
#7  _PyEval_EvalCodeWithName (_co=0x7f3990b34e40, globals=<optimized out>, locals=locals@entry=0x0, args=<optimized out>, argcount=2, kwnames=0x0, kwargs=0x7f398da34400, kwcount=0, kwstep=1, defs=0x7f3990b35990, defcount=1, kwdefs=0x0, closure=0x0, name=0x7f3990b14dc0, qualname=0x7f3990b2cc10) at Python/ceval.c:3930
#8  0x000055f8b7325bb6 in _PyFunction_FastCallKeywords (func=<optimized out>, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at Objects/call.c:433
#9  0x000055f8b731287b in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#10 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3110
#11 0x000055f8b73dd7b8 in PyEval_EvalFrameEx (throwflag=0, f=0x7f398da34248) at Python/ceval.c:547
#12 _PyEval_EvalCodeWithName (_co=0x7f3991ddd300, globals=<optimized out>, locals=locals@entry=0x0, args=<optimized out>, argcount=1, kwnames=0x0, kwargs=0x7f39880011b8, kwcount=0, kwstep=1, defs=0x7f3991ddb8e8, defcount=1, kwdefs=0x0, closure=0x0, name=0x7f3991eb5f48, qualname=0x7f3991eb5f48) at Python/ceval.c:3930
#13 0x000055f8b7325bb6 in _PyFunction_FastCallKeywords (func=<optimized out>, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at Objects/call.c:433
#14 0x000055f8b73115c1 in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#15 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3124
#16 0x000055f8b73dd7b8 in PyEval_EvalFrameEx (throwflag=0, f=0x7f3988000f78) at Python/ceval.c:547
#17 _PyEval_EvalCodeWithName (_co=_co@entry=0x7f3990da68a0, globals=globals@entry=0x7f39910993f0, locals=locals@entry=0x0, args=args@entry=0x7f398f5daf68, argcount=argcount@entry=7, kwnames=kwnames@entry=0x0, kwargs=0x0, kwcount=0, kwstep=2, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name=0x7f3990dc9120, qualname=0x7f3990dc9120) at Python/ceval.c:3930
#18 0x000055f8b7325907 in _PyFunction_FastCallDict (func=0x7f398da20ae8, args=0x7f398f5daf68, nargs=7, kwargs=0x7f398da2ca20) at Objects/call.c:376
#19 0x000055f8b730cf90 in do_call_core (kwdict=0x7f398da2ca20, callargs=0x7f398f5daf50, func=0x7f398da20ae8) at Python/ceval.c:4645
#20 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3191
#21 0x000055f8b7309728 in function_code_fastcall (co=<optimized out>, args=<optimized out>, nargs=1, globals=<optimized out>) at Objects/call.c:283
#22 0x000055f8b7325c8f in _PyFunction_FastCallKeywords (func=<optimized out>, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at Objects/call.c:415
#23 0x000055f8b731287b in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#24 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3110
#25 0x000055f8b7309728 in function_code_fastcall (co=<optimized out>, args=<optimized out>, nargs=1, globals=<optimized out>) at Objects/call.c:283
#26 0x000055f8b7325c8f in _PyFunction_FastCallKeywords (func=<optimized out>, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at Objects/call.c:415
#27 0x000055f8b731287b in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#28 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3110
#29 0x000055f8b7309728 in function_code_fastcall (co=co@entry=0x7f3990da8b70, args=<optimized out>, args@entry=0x7f398d01ce60, nargs=nargs@entry=1, globals=globals@entry=0x7f3990d8fdc8) at Objects/call.c:283
#30 0x000055f8b7325af6 in _PyFunction_FastCallDict (func=func@entry=0x7f3990db7048, args=args@entry=0x7f398d01ce60, nargs=nargs@entry=1, kwargs=kwargs@entry=0x0) at Objects/call.c:322
#31 0x000055f8b7328b01 in _PyObject_FastCallDict (kwargs=0x0, nargs=1, args=0x7f398d01ce60, callable=0x7f3990db7048) at Objects/call.c:98
#32 _PyObject_Call_Prepend (callable=0x7f3990db7048, obj=<optimized out>, args=0x7f3991f0b048, kwargs=0x0) at Objects/call.c:904
#33 0x000055f8b7326fba in PyObject_Call (callable=0x7f3990d5fec8, args=<optimized out>, kwargs=<optimized out>) at Objects/call.c:245
#34 0x000055f8b746c493 in t_bootstrap (boot_raw=boot_raw@entry=0x7f398f604468) at ./Modules/_threadmodule.c:994
#35 0x000055f8b7423b57 in pythread_wrapper (arg=<optimized out>) at Python/thread_pthread.h:174
#36 0x00007f3991b7f4a4 in start_thread (arg=0x7f398d01d700) at pthread_create.c:456
#37 0x00007f39911b6d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 1 (Thread 0x7f3991f9ce80 (LWP 12542)):
#0  0x00007f3991b87556 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x55f8b8ebc520) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x55f8b8ebc520, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007f3991b87604 in __new_sem_wait_slow (sem=0x55f8b8ebc520, abstime=0x0) at sem_waitcommon.c:181
#3  0x00007f3991b87699 in __new_sem_wait (sem=sem@entry=0x55f8b8ebc520) at sem_wait.c:29
#4  0x000055f8b7423f58 in PyThread_acquire_lock_timed (lock=lock@entry=0x55f8b8ebc520, microseconds=microseconds@entry=-1000000, intr_flag=intr_flag@entry=1) at Python/thread_pthread.h:372
#5  0x000055f8b746d8ba in acquire_timed (timeout=-1000000000, lock=0x55f8b8ebc520) at ./Modules/_threadmodule.c:61
#6  lock_PyThread_acquire_lock (self=0x7f398f6040a8, args=<optimized out>, kwds=<optimized out>) at ./Modules/_threadmodule.c:144
#7  0x000055f8b732603a in _PyMethodDef_RawFastCallKeywords (method=0x55f8b77ccc20 <lock_methods+32>, self=self@entry=0x7f398f6040a8, args=args@entry=0x7f3980001c78, nargs=nargs@entry=0, kwnames=kwnames@entry=0x0) at Objects/call.c:690
#8  0x000055f8b74ad839 in _PyMethodDescr_FastCallKeywords (descrobj=descrobj@entry=0x7f3991f08360, args=args@entry=0x7f3980001c70, nargs=nargs@entry=1, kwnames=kwnames@entry=0x0) at Objects/descrobject.c:288
#9  0x000055f8b731208e in call_function (kwnames=0x0, oparg=1, pp_stack=<synthetic pointer>) at Python/ceval.c:4593
#10 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3110
#11 0x000055f8b73dd7b8 in PyEval_EvalFrameEx (throwflag=0, f=0x7f3980001ad8) at Python/ceval.c:547
#12 _PyEval_EvalCodeWithName (_co=0x7f3990da6300, globals=<optimized out>, locals=locals@entry=0x0, args=<optimized out>, argcount=2, kwnames=0x0, kwargs=0x7f3990b12b40, kwcount=0, kwstep=1, defs=0x7f3990d9dae0, defcount=1, kwdefs=0x0, closure=0x0, name=0x7f3991eb5f48, qualname=0x7f3990da42f0) at Python/ceval.c:3930
#13 0x000055f8b7325bb6 in _PyFunction_FastCallKeywords (func=<optimized out>, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at Objects/call.c:433
#14 0x000055f8b731287b in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#15 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3110
#16 0x000055f8b73dd7b8 in PyEval_EvalFrameEx (throwflag=0, f=0x7f3990b129a8) at Python/ceval.c:547
#17 _PyEval_EvalCodeWithName (_co=0x7f3991e37f60, globals=<optimized out>, locals=locals@entry=0x0, args=<optimized out>, argcount=1, kwnames=0x0, kwargs=0x7f3991ef8b78, kwcount=0, kwstep=1, defs=0x7f39910a60d0, defcount=1, kwdefs=0x0, closure=0x0, name=0x7f3991e51d18, qualname=0x7f39910a47b0) at Python/ceval.c:3930
#18 0x000055f8b7325bb6 in _PyFunction_FastCallKeywords (func=<optimized out>, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at Objects/call.c:433
#19 0x000055f8b731287b in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#20 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3110
#21 0x000055f8b73dd7b8 in PyEval_EvalFrameEx (throwflag=0, f=0x7f3991ef89f8) at Python/ceval.c:547
#22 _PyEval_EvalCodeWithName (_co=_co@entry=0x7f3991e108a0, globals=globals@entry=0x7f3991f460a8, locals=locals@entry=0x7f3991e108a0, args=args@entry=0x0, argcount=argcount@entry=0, kwnames=kwnames@entry=0x0, kwargs=0x0, kwcount=0, kwstep=2, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name=0x0, qualname=0x0) at Python/ceval.c:3930
#23 0x000055f8b73dd8c3 in PyEval_EvalCodeEx (closure=0x0, kwdefs=0x0, defcount=0, defs=0x0, kwcount=0, kws=0x0, argcount=0, args=0x0, locals=locals@entry=0x7f3991e108a0, globals=globals@entry=0x7f3991f460a8, _co=_co@entry=0x7f3991e108a0) at Python/ceval.c:3959
#24 PyEval_EvalCode (co=co@entry=0x7f3991e108a0, globals=globals@entry=0x7f3991e4c240, locals=locals@entry=0x7f3991e4c240) at Python/ceval.c:524
#25 0x000055f8b7414c19 in run_mod (arena=0x7f3991f460a8, flags=0x7ffc906f7cec, locals=0x7f3991e4c240, globals=0x7f3991e4c240, filename=0x7f3991e89f70, mod=0x55f8b8e29020) at Python/pythonrun.c:1035
#26 PyRun_FileExFlags (fp=0x55f8b8e470b0, filename_str=<optimized out>, start=<optimized out>, globals=0x7f3991e4c240, locals=0x7f3991e4c240, closeit=1, flags=0x7ffc906f7cec) at Python/pythonrun.c:988
#27 0x000055f8b7414e35 in PyRun_SimpleFileExFlags (fp=0x55f8b8e470b0, filename=<optimized out>, closeit=1, flags=0x7ffc906f7cec) at Python/pythonrun.c:429
#28 0x000055f8b73194ee in pymain_run_file (p_cf=0x7ffc906f7cec, filename=0x55f8b8dea310 L"cf-deadlock.py", fp=0x55f8b8e470b0) at Modules/main.c:427
#29 pymain_run_filename (cf=0x7ffc906f7cec, pymain=0x7ffc906f7dc0) at Modules/main.c:1627
#30 pymain_run_python (pymain=0x7ffc906f7dc0) at Modules/main.c:2876
#31 pymain_main (pymain=pymain@entry=0x7ffc906f7dc0) at Modules/main.c:3037
#32 0x000055f8b731976b in _Py_UnixMain (argc=<optimized out>, argv=<optimized out>) at Modules/main.c:3072
#33 0x00007f39910ee2e1 in __libc_start_main (main=0x55f8b73096b0 <main>, argc=2, argv=0x7ffc906f7f08, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc906f7ef8) at ../csu/libc-start.c:291
#34 0x000055f8b731328a in _start ()