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There was a crash.
This is the entire stack trace of all threads:
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Thread 2 (Thread 0x7f761728c700 (LWP 1323)):
#0  0x00007f76242dd827 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0xe403d0) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem
entry=0xe403d0, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007f76242dd8d4 in __new_sem_wait_slow (sem=0xe403d0, abstime=0x0) at sem_waitcommon.c:181
#3  0x00007f76242dd97a in __new_sem_wait (sem=<optimized out>) at sem_wait.c:29
#4  0x000000000049f414 in PyThread_acquire_lock ()
#5  0x00000000004e9e5a in PyEval_RestoreThread ()
#6  0x0000000000598289 in ?? ()
#7  0x00000000004c468a in PyEval_EvalFrameEx ()
#8  0x00000000004c2765 in PyEval_EvalCodeEx ()
#9  0x00000000004de8b8 in ?? ()
#10 0x00000000004b0cb3 in PyObject_Call ()
#11 0x00000000004c6ad1 in PyEval_EvalFrameEx ()
#12 0x00000000004c9d8f in PyEval_EvalFrameEx ()
#13 0x00000000004c9d8f in PyEval_EvalFrameEx ()
#14 0x00000000004c2765 in PyEval_EvalCodeEx ()
#15 0x00000000004de6fe in ?? ()
#16 0x00000000004b0cb3 in PyObject_Call ()
#17 0x00000000004f492e in ?? ()
#18 0x00000000004b0cb3 in PyObject_Call ()
#19 0x00000000004ce5d0 in PyEval_CallObjectWithKeywords ()
#20 0x0000000000597e32 in ?? ()
#21 0x00007f76242d56ba in start_thread (arg=0x7f761728c700) at pthread_create.c:333
#22 0x00007f762400b82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f76246e1700 (LWP 1295)):
#0  0x00007f7623fd051b in __GI___waitpid (pid=1443, stat_loc=stat_loc
entry=0x7ffcab4ea6c0, options=options
entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:29
#1  0x00007f7623f49fbb in do_system (line=<optimized out>) at ../sysdeps/posix/system.c:148
#2  0x00007f7621e745b4 in TUnixSystem::Exec (shellcmd=<optimized out>, this=0xda7b70) at /home/smazza/Downloads/root-6.06.02_withfix/core/unix/src/TUnixSystem.cxx:2073
#3  TUnixSystem::StackTrace (this=0xda7b70) at /home/smazza/Downloads/root-6.06.02_withfix/core/unix/src/TUnixSystem.cxx:2301
#4  0x00007f7621e7669c in TUnixSystem::DispatchSignals (this=0xda7b70, sig=kSigSegmentationViolation) at /home/smazza/Downloads/root-6.06.02_withfix/core/unix/src/TUnixSystem.cxx:3539
#5  <signal handler called>
#6  0x00007f7622400095 in TBufferFile::WriteObjectAny (this=0x7ffcab4eeea0, obj=0x2ba0620, ptrClass=0x332c1b0) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:2622
#7  0x00007f7622322946 in TGenCollectionStreamer::WriteMap (this=this
entry=0x35a48d0, nElements=nElements
entry=2, b=...) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TGenCollectionStreamer.cxx:1126
#8  0x00007f76223250de in TGenCollectionStreamer::Streamer (this=0x35a48d0, b=...) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TGenCollectionStreamer.cxx:1488
#9  0x00007f762234fa82 in TCollectionStreamer::Streamer (this=0x35a48b8, buff=..., pObj=<optimized out>, onFileClass=0x0) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TCollectionProxyFactory.cxx:166
#10 0x00007f76224019f5 in TClass::Streamer (onfile_class=0x0, b=..., obj=0x882fb98, this=0x35a4090) at /usr/local/bin/root-6.06.02/include/TClass.h:547
#11 TBufferFile::WriteFastArray (this=0x7ffcab4eeea0, start=<optimized out>, cl=0x35a4090, n=<optimized out>, streamer=<optimized out>) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:2283
#12 0x00007f76223eb155 in TStreamerInfo::WriteBufferAux<char**> (this=0x2f7af80, b=..., arr=
0x7ffcab4ed240: 0x7ffcab4ed238, compinfo=0x1aa29a8, first=first
entry=0, last=last
entry=1, narr=1, eoffset=0, arrayMode=0) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TStreamerInfoWriteBuffer.cxx:590
#13 0x00007f762228b483 in TStreamerInfoActions::GenericWriteAction (buf=..., addr=<optimized out>, config=<optimized out>) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TStreamerInfoActions.cxx:174
#14 0x00007f76224005d5 in TStreamerInfoActions::TConfiguredAction::operator() (this=<optimized out>, this=<optimized out>, object=0x882fb80, buffer=...) at /usr/local/bin/root-6.06.02/include/TStreamerInfoActions.h:116
#15 TBufferFile::ApplySequence (this=0x7ffcab4eeea0, sequence=..., obj=0x882fb80) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:3967
#16 0x00007f7622401ede in TBufferFile::WriteClassBuffer (this=0x7ffcab4eeea0, cl=0x3133dd0, pointer=0x882fb80) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:3935
#17 0x00007f76224074dc in TClass::Streamer (onfile_class=0x0, b=..., obj=0x882fb80, this=0x3133dd0) at /usr/local/bin/root-6.06.02/include/TClass.h:547
#18 TBufferFile::WriteObjectClass (this=0x7ffcab4eeea0, actualObjectStart=0x882fb80, actualClass=0x3133dd0) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:2580
#19 0x00007f76224000b6 in TBufferFile::WriteObjectAny (this=0x7ffcab4eeea0, obj=0x882fb80, ptrClass=0x3133dd0) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:2638
#20 0x00007f7622401b04 in TBufferFile::WriteFastArray (this=0x7ffcab4eeea0, start=<optimized out>, cl=0x3133dd0, n=<optimized out>, isPreAlloc=<optimized out>, streamer=<optimized out>) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:2323
#21 0x00007f76223ea409 in TStreamerInfo::WriteBufferAux<char**> (this=0xf2c0b0, b=..., arr=
0x7ffcab4ed520: 0x7ffcab4ed518, compinfo=0x397f798, first=first
entry=0, last=last
entry=1, narr=1, eoffset=0, arrayMode=0) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TStreamerInfoWriteBuffer.cxx:449
#22 0x00007f762228b483 in TStreamerInfoActions::GenericWriteAction (buf=..., addr=<optimized out>, config=<optimized out>) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TStreamerInfoActions.cxx:174
#23 0x00007f76224005d5 in TStreamerInfoActions::TConfiguredAction::operator() (this=<optimized out>, this=<optimized out>, object=0x10167520, buffer=...) at /usr/local/bin/root-6.06.02/include/TStreamerInfoActions.h:116
#24 TBufferFile::ApplySequence (this=0x7ffcab4eeea0, sequence=..., obj=0x10167520) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:3967
#25 0x00007f7622401ede in TBufferFile::WriteClassBuffer (this=this
entry=0x7ffcab4eeea0, cl=0x308b310, pointer=pointer
entry=0x10167520) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:3935
#26 0x00007f7615368ea1 in RooAbsArg::Streamer (this=0x10167520/build/gdb-cXfXJ3/gdb-7.11.1/gdb/stack.c:625: internal-error: print_frame_args: Assertion `nsym != NULL' failed.
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The lines below might hint at the cause of the crash.
If they do not help you then please submit a bug report at
http://root.cern.ch/bugs. Please post the ENTIRE stack trace
from above as an attachment in addition to anything else
that might help us fixing this issue.
===========================================================
#6  0x00007f7622400095 in TBufferFile::WriteObjectAny (this=0x7ffcab4eeea0, obj=0x2ba0620, ptrClass=0x332c1b0) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:2622
#7  0x00007f7622322946 in TGenCollectionStreamer::WriteMap (this=this
entry=0x35a48d0, nElements=nElements
entry=2, b=...) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TGenCollectionStreamer.cxx:1126
#8  0x00007f76223250de in TGenCollectionStreamer::Streamer (this=0x35a48d0, b=...) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TGenCollectionStreamer.cxx:1488
#9  0x00007f762234fa82 in TCollectionStreamer::Streamer (this=0x35a48b8, buff=..., pObj=<optimized out>, onFileClass=0x0) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TCollectionProxyFactory.cxx:166
#10 0x00007f76224019f5 in TClass::Streamer (onfile_class=0x0, b=..., obj=0x882fb98, this=0x35a4090) at /usr/local/bin/root-6.06.02/include/TClass.h:547
#11 TBufferFile::WriteFastArray (this=0x7ffcab4eeea0, start=<optimized out>, cl=0x35a4090, n=<optimized out>, streamer=<optimized out>) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:2283
#12 0x00007f76223eb155 in TStreamerInfo::WriteBufferAux<char**> (this=0x2f7af80, b=..., arr=
0x7ffcab4ed240: 0x7ffcab4ed238, compinfo=0x1aa29a8, first=first
entry=0, last=last
entry=1, narr=1, eoffset=0, arrayMode=0) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TStreamerInfoWriteBuffer.cxx:590
#13 0x00007f762228b483 in TStreamerInfoActions::GenericWriteAction (buf=..., addr=<optimized out>, config=<optimized out>) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TStreamerInfoActions.cxx:174
#14 0x00007f76224005d5 in TStreamerInfoActions::TConfiguredAction::operator() (this=<optimized out>, this=<optimized out>, object=0x882fb80, buffer=...) at /usr/local/bin/root-6.06.02/include/TStreamerInfoActions.h:116
#15 TBufferFile::ApplySequence (this=0x7ffcab4eeea0, sequence=..., obj=0x882fb80) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:3967
#16 0x00007f7622401ede in TBufferFile::WriteClassBuffer (this=0x7ffcab4eeea0, cl=0x3133dd0, pointer=0x882fb80) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:3935
#17 0x00007f76224074dc in TClass::Streamer (onfile_class=0x0, b=..., obj=0x882fb80, this=0x3133dd0) at /usr/local/bin/root-6.06.02/include/TClass.h:547
#18 TBufferFile::WriteObjectClass (this=0x7ffcab4eeea0, actualObjectStart=0x882fb80, actualClass=0x3133dd0) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:2580
#19 0x00007f76224000b6 in TBufferFile::WriteObjectAny (this=0x7ffcab4eeea0, obj=0x882fb80, ptrClass=0x3133dd0) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:2638
#20 0x00007f7622401b04 in TBufferFile::WriteFastArray (this=0x7ffcab4eeea0, start=<optimized out>, cl=0x3133dd0, n=<optimized out>, isPreAlloc=<optimized out>, streamer=<optimized out>) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:2323
#21 0x00007f76223ea409 in TStreamerInfo::WriteBufferAux<char**> (this=0xf2c0b0, b=..., arr=
0x7ffcab4ed520: 0x7ffcab4ed518, compinfo=0x397f798, first=first
entry=0, last=last
entry=1, narr=1, eoffset=0, arrayMode=0) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TStreamerInfoWriteBuffer.cxx:449
#22 0x00007f762228b483 in TStreamerInfoActions::GenericWriteAction (buf=..., addr=<optimized out>, config=<optimized out>) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TStreamerInfoActions.cxx:174
#23 0x00007f76224005d5 in TStreamerInfoActions::TConfiguredAction::operator() (this=<optimized out>, this=<optimized out>, object=0x10167520, buffer=...) at /usr/local/bin/root-6.06.02/include/TStreamerInfoActions.h:116
#24 TBufferFile::ApplySequence (this=0x7ffcab4eeea0, sequence=..., obj=0x10167520) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:3967
#25 0x00007f7622401ede in TBufferFile::WriteClassBuffer (this=this
entry=0x7ffcab4eeea0, cl=0x308b310, pointer=pointer
entry=0x10167520) at /home/smazza/Downloads/root-6.06.02_withfix/io/io/src/TBufferFile.cxx:3935
#26 0x00007f7615368ea1 in RooAbsArg::Streamer (this=0x10167520/build/gdb-cXfXJ3/gdb-7.11.1/gdb/stack.c:625: internal-error: print_frame_args: Assertion `nsym != NULL' failed.
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Traceback (most recent call last):
  File "./loop_cls.py", line 162, in <module>
    args.npoints, args.min_poi, args.max_poi, 1000)
SystemError: void ::StandardHypoTestInvDemo(const char* infile = 0, const char* wsName = "combined", const char* modelSBName = "ModelConfig", const char* modelBName = "", const char* dataName = "obsData", int calculatorType = 0, int testStatType = 0, bool useCLs = true, int npoints = 6, double poimin = 0, double poimax = 5, int ntoys = 1000, bool useNumberCounting = false, const char* nuisPriorName = 0) =>
    problem in C++; program state has been reset