celery parent process

(gdb) bt
#0  0x00007fcf9a5e0a03 in epoll_wait () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x000000000049531a in ?? ()
#2  0x000000000056d4a4 in PyEval_EvalFrameEx ()
#3  0x00000000005747c0 in PyEval_EvalCodeEx ()
#4  0x000000000056da48 in PyEval_EvalFrameEx ()
#5  0x00000000005747c0 in PyEval_EvalCodeEx ()
#6  0x000000000056da48 in PyEval_EvalFrameEx ()
#7  0x000000000056853a in ?? ()
#8  0x000000000043b910 in ?? ()
#9  0x000000000056d4a4 in PyEval_EvalFrameEx ()
#10 0x00000000005747c0 in PyEval_EvalCodeEx ()
#11 0x00000000005697b0 in ?? ()
#12 0x000000000043a8b6 in PyObject_Call ()
#13 0x000000000056f247 in PyEval_EvalFrameEx ()
#14 0x00000000005747c0 in PyEval_EvalCodeEx ()
#15 0x000000000056da48 in PyEval_EvalFrameEx ()
#16 0x00000000005747c0 in PyEval_EvalCodeEx ()
#17 0x000000000056da48 in PyEval_EvalFrameEx ()
#18 0x00000000005747c0 in PyEval_EvalCodeEx ()
#19 0x000000000056da48 in PyEval_EvalFrameEx ()
#20 0x00000000005747c0 in PyEval_EvalCodeEx ()
#21 0x000000000056da48 in PyEval_EvalFrameEx ()
#22 0x00000000005747c0 in PyEval_EvalCodeEx ()
#23 0x000000000056da48 in PyEval_EvalFrameEx ()
#24 0x00000000005747c0 in PyEval_EvalCodeEx ()
#25 0x000000000056da48 in PyEval_EvalFrameEx ()
#26 0x00000000005747c0 in PyEval_EvalCodeEx ()
#27 0x00000000005698e2 in ?? ()
#28 0x000000000043a8b6 in PyObject_Call ()
#29 0x000000000056f247 in PyEval_EvalFrameEx ()
#30 0x00000000005747c0 in PyEval_EvalCodeEx ()
#31 0x00000000005698e2 in ?? ()
#32 0x000000000043a8b6 in PyObject_Call ()
#33 0x00000000004fd6ea in ?? ()
#34 0x000000000043a8b6 in PyObject_Call ()
#35 0x00000000004fc51e in ?? ()
#36 0x000000000043a8b6 in PyObject_Call ()
#37 0x000000000056f247 in PyEval_EvalFrameEx ()
#38 0x00000000005747c0 in PyEval_EvalCodeEx ()
#39 0x000000000056da48 in PyEval_EvalFrameEx ()
#40 0x00000000005747c0 in PyEval_EvalCodeEx ()
#41 0x000000000056da48 in PyEval_EvalFrameEx ()
#42 0x00000000005747c0 in PyEval_EvalCodeEx ()
#43 0x000000000056da48 in PyEval_EvalFrameEx ()
#44 0x00000000005747c0 in PyEval_EvalCodeEx ()
#45 0x000000000056da48 in PyEval_EvalFrameEx ()
#46 0x00000000005747c0 in PyEval_EvalCodeEx ()
#47 0x000000000056da48 in PyEval_EvalFrameEx ()
#48 0x00000000005747c0 in PyEval_EvalCodeEx ()
#49 0x000000000056da48 in PyEval_EvalFrameEx ()
#50 0x00000000005747c0 in PyEval_EvalCodeEx ()
#51 0x000000000056da48 in PyEval_EvalFrameEx ()
#52 0x00000000005747c0 in PyEval_EvalCodeEx ()
#53 0x0000000000569ee1 in PyRun_FileExFlags ()
#54 0x000000000056a6b3 in PyRun_SimpleFileExFlags ()
#55 0x000000000056ba75 in Py_Main ()
#56 0x00007fcf9a50e76d in __libc_start_main ()
   from /lib/x86_64-linux-gnu/libc.so.6
#57 0x000000000041bb11 in _start ()