I’m working on a machine learning task using PyROOT Now. My program read the value from a tree, then transfer it to numpy array, however, sometimes, the program work well, sometimes it encounters a crash like below(usually it happen when I want to deal with more data while the memory is enough), because it doesn’t provide any useful information, I can’t track where is wrong, does somebody know something, if you can give any prompting, I will be very appreciate:
*** Break *** segmentation violation
===========================================================
There was a crash (#8 0xb5068ebb in SigHandler(ESignals) () from /home/xiaodan/root/lib/libCore.so).
This is the entire stack trace of all threads:
Thread 3 (Thread 0xb3f71b40 (LWP 31995)): #0 0xb7782424 in __kernel_vsyscall () #1 0xb775ccc5 in sem_wait
GLIBC_2.1 () at …/nptl/sysdeps/unix/sysv/linux/i386/i686/…/i486/sem_wait.S:80 #2 0x08169fa6 in PyEval_RestoreThread () #3 0x0818772f in ?? () #4 0x081949c1 in PyEval_EvalFrameEx () #5 0x0819af70 in PyEval_EvalCodeEx () #6 0x0819c972 in ?? () #7 0x081287ef in PyObject_Call () #8 0x081964bb in PyEval_EvalFrameEx () #9 0x08194eec in PyEval_EvalFrameEx () #10 0x08194eec in PyEval_EvalFrameEx () #11 0x0819af70 in PyEval_EvalCodeEx () #12 0x0819c82e in ?? () #13 0x081287ef in PyObject_Call () #14 0x080d8e37 in ?? () #15 0x081287ef in PyObject_Call () #16 0x08128c59 in PyEval_CallObjectWithKeywords () #17 0x0807c8ed in ?? () #18 0xb7756d4c in start_thread (arg=0xb3f71b40) at pthread_create.c:308 #19 0xb7473f4e in clone () at …/sysdeps/unix/sysv/linux/i386/clone.S:130
Thread 2 (Thread 0xb2a23b40 (LWP 31996)): #0 0xb7782424 in __kernel_vsyscall () #1 0xb775ccc5 in sem_wait
GLIBC_2.1 () at …/nptl/sysdeps/unix/sysv/linux/i386/i686/…/i486/sem_wait.S:80 #2 0x0815e3c9 in ?? () #3 0x081949c1 in PyEval_EvalFrameEx () #4 0x0819af70 in PyEval_EvalCodeEx () #5 0x08194dfc in PyEval_EvalFrameEx () #6 0x0819af70 in PyEval_EvalCodeEx () #7 0x08194dfc in PyEval_EvalFrameEx () #8 0x0819af70 in PyEval_EvalCodeEx () #9 0x0819c972 in ?? () #10 0x081287ef in PyObject_Call () #11 0x081964bb in PyEval_EvalFrameEx () #12 0x0819af70 in PyEval_EvalCodeEx () #13 0x08194dfc in PyEval_EvalFrameEx () #14 0x08194eec in PyEval_EvalFrameEx () #15 0x08194eec in PyEval_EvalFrameEx () #16 0x0819af70 in PyEval_EvalCodeEx () #17 0x0819c82e in ?? () #18 0x081287ef in PyObject_Call () #19 0x080d8e37 in ?? () #20 0x081287ef in PyObject_Call () #21 0x08128c59 in PyEval_CallObjectWithKeywords () #22 0x0807c8ed in ?? () #23 0xb7756d4c in start_thread (arg=0xb2a23b40) at pthread_create.c:308 #24 0xb7473f4e in clone () at …/sysdeps/unix/sysv/linux/i386/clone.S:130
Thread 1 (Thread 0xb7339b00 (LWP 31987)): #0 0xb7782424 in __kernel_vsyscall () #1 0xb743cb7b in waitpid () at …/sysdeps/unix/syscall-template.S:82 #2 0xb73c4003 in do_system (line=0xb1f01500 “/home/xiaodan/root/etc/gdb-backtrace.sh 31987 1>&2”) at …/sysdeps/posix/system.c:149 #3 0xb73c44ba in __libc_system (line=0xb1f01500 “/home/xiaodan/root/etc/gdb-backtrace.sh 31987 1>&2”) at …/sysdeps/posix/system.c:190 #4 0xb775ee2b in system (line=0xb1f01500 “/home/xiaodan/root/etc/gdb-backtrace.sh 31987 1>&2”) at pt-system.c:29 #5 0xb5061c7b in TUnixSystem::Exec(char const*) () from /home/xiaodan/root/lib/libCore.so #6 0xb5066280 in TUnixSystem::StackTrace() () from /home/xiaodan/root/lib/libCore.so #7 0xb5068da7 in TUnixSystem::DispatchSignals(ESignals) () from /home/xiaodan/root/lib/libCore.so #8 0xb5068ebb in SigHandler(ESignals) () from /home/xiaodan/root/lib/libCore.so #9 0xb505feb2 in sighandler(int) () from /home/xiaodan/root/lib/libCore.so #10 #11 0xb6edd00e in ?? () from /usr/lib/python2.7/dist-packages/numpy/core/umath.so #12 0xb6ef6b0c in ?? () from /usr/lib/python2.7/dist-packages/numpy/core/umath.so #13 0xb6ef783f in ?? () from /usr/lib/python2.7/dist-packages/numpy/core/umath.so #14 0x081287ef in PyObject_Call () #15 0x080b49ce in _PyObject_CallFunction_SizeT () #16 0xb6fa6f99 in ?? () from /usr/lib/python2.7/dist-packages/numpy/core/multiarray.so #17 0xb6fb7b52 in ?? () from /usr/lib/python2.7/dist-packages/numpy/core/multiarray.so #18 0x08125147 in ?? () #19 0x08196128 in PyEval_EvalFrameEx () #20 0x08194eec in PyEval_EvalFrameEx () #21 0x08194eec in PyEval_EvalFrameEx () #22 0x08194eec in PyEval_EvalFrameEx () #23 0x0819af70 in PyEval_EvalCodeEx () #24 0x08194dfc in PyEval_EvalFrameEx () #25 0x0819af70 in PyEval_EvalCodeEx () #26 0x08194dfc in PyEval_EvalFrameEx () #27 0x0819af70 in PyEval_EvalCodeEx () #28 0x0819b8a1 in PyRun_FileExFlags () #29 0x080a8bda in PyRun_SimpleFileExFlags () #30 0x080a9949 in Py_Main () #31 0x0805ea5b in main ()
The lines below might hint at the cause of the crash.
If they do not help you then please submit a bug report at 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.
#11 0xb6edd00e in ?? () from /usr/lib/python2.7/dist-packages/numpy/core/umath.so #12 0xb6ef6b0c in ?? () from /usr/lib/python2.7/dist-packages/numpy/core/umath.so #13 0xb6ef783f in ?? () from /usr/lib/python2.7/dist-packages/numpy/core/umath.so #14 0x081287ef in PyObject_Call () #15 0x080b49ce in _PyObject_CallFunction_SizeT () #16 0xb6fa6f99 in ?? () from /usr/lib/python2.7/dist-packages/numpy/core/multiarray.so #17 0xb6fb7b52 in ?? () from /usr/lib/python2.7/dist-packages/numpy/core/multiarray.so #18 0x08125147 in ?? () #19 0x08196128 in PyEval_EvalFrameEx () #20 0x08194eec in PyEval_EvalFrameEx () #21 0x08194eec in PyEval_EvalFrameEx () #22 0x08194eec in PyEval_EvalFrameEx () #23 0x0819af70 in PyEval_EvalCodeEx () #24 0x08194dfc in PyEval_EvalFrameEx () #25 0x0819af70 in PyEval_EvalCodeEx () #26 0x08194dfc in PyEval_EvalFrameEx () #27 0x0819af70 in PyEval_EvalCodeEx () #28 0x0819b8a1 in PyRun_FileExFlags () #29 0x080a8bda in PyRun_SimpleFileExFlags () #30 0x080a9949 in Py_Main () #31 0x0805ea5b in main ()