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Asking for Help: thread started by 'bg' ends without any notification

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I already have a tool programmed using python language and I am trying to add a functionality over it. For that purpose I have written certain functions and utilities and I start these functions in separate threads using 'bg <func_name>'. Now some of the threads are dying without any notification or exception.

Here is the output showing threads just after all the threads are started -

sae_sim In[8]: threading.enumerate
-------------> threading.enumerate()
sae_sim Out[8]:

[<_MainThread(MainThread, started)>,

 <SelectThread(MME UserData Thread, started daemon)>,

 <SelectThread(EGTP node thread, started daemon)>,

 <SelectThread(EGTP node thread, started daemon)>,

 <BackgroundJob: SendData(mme, sgsn, LocalImsi='404660000110000', callNo=10000, delay=2, destIpv4=tunra, destIpv6='', randomize=1)>,     >>>>>>>>>>>>>>>>>>>>>>

 <BackgroundJob: GnGpHand(mme, sgsn, LocalImsi='404660000110000', callNo=10000, delay=2, TAU=1, pco_v1=pco_v1, com_flags=None, randomize=1)>,     >>>>>>>>>>>>>>>>>>>>>>

 <SelectThread(SGSN UserData Thread, started daemon)>,

 <BackgroundJob: MultipleCallsUp(mme, LocalImsi='404660000110000', callNo=5000, delay=1, myApnStr='imsauthapn', ue_tz=None, pco=None, pco_v1=None, com_flags=None, uli_v1=None, rai_v1=None, static=0, trace=1, app_type=APP_TYPES.MME, randomize=1)>,     >>>>>>>>>>>>>>>>>>>>>>

 <SelectThread(EGTP node thread, started daemon)>,

 <SelectThread(EGTP node thread, started daemon)>,

 <_Timer(Thread-1, started)>,

 <SelectThread(EGTP node thread, started daemon)>,

 <SelectThread(EGTP node thread, started daemon)>,

 <BackgroundJob: MultipleCallsUp(sgsn, LocalImsi='404660000115000', callNo=5000, delay=1, myApnStr='imsauthapn', ue_tz=None, pco=None, pco_v1=pco_v1, com_flags=None, uli_v1=None, rai_v1=None, static=0, app_type=APP_TYPES.SGSN, randomize=1)>,     >>>>>>>>>>>>>>>>>>>>>>

 <_Timer(Thread-41, started)>]

Somewhere during the execution '<BackgroundJob: MultipleCallsUp(sgsn, LocalImsi='404660000115000', callNo=5000, delay=1, myApnStr='imsauthapn', ue_tz=None, pco=None, pco_v1=pco_v1, com_flags=None, uli_v1=None, rai_v1=None, static=0, app_type=APP_TYPES.SGSN, randomize=1)>' thread gets killed and there is no trace on how and why it has ended. Here is the output of threading.enumerate() captured when I understood from the execution stats the some of the threads might have gotten killed -

--------------> threading.enumerate()
sae_sim Out[14]:

[<_Timer(Thread-107597, started daemon)>,

 <SelectThread(EGTP node thread, started daemon)>,

 <SelectThread(EGTP node thread, started daemon)>,

 <BackgroundJob: SendData(mme, sgsn, LocalImsi='404660000110000', callNo=10000, delay=2, destIpv4=tunra, destIpv6='', randomize=1)>,    >>>>>>>>>>>>

 <BackgroundJob: GnGpHand(mme, sgsn, LocalImsi='404660000110000', callNo=10000, delay=2, TAU=1, pco_v1=pco_v1, com_flags=None, randomize=1)>,   >>>>>>>>>>>>>>

 <SelectThread(EGTP node thread, started daemon)>,

 <SelectThread(EGTP node thread, started daemon)>,

 <_Timer(Thread-107607, started daemon)>,

 <_Timer(Thread-107602, started daemon)>,

 <SelectThread(EGTP node thread, started daemon)>,

 <_Timer(Thread-107587, started daemon)>,

 <BackgroundJob: MultipleCallsUp(mme, LocalImsi='404660000110000', callNo=5000, delay=1, myApnStr='imsauthapn', ue_tz=None, pco=None, pco_v1=None, com_flags=None, uli_v1=None, rai_v1=None, static=0, trace=1, app_type=APP_TYPES.MME, randomize=1)>,      >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

 <SelectThread(SGSN UserData Thread, started daemon)>,

 <_Timer(Thread-120447, started)>,

 <_MainThread(MainThread, started)>,

 <SelectThread(EGTP node thread, started daemon)>,

 <SelectThread(MME UserData Thread, started daemon)>]

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