Matlab Crash in RegressionTree mex file - matlab

Question

I'm trying to implement a classifier on matlab that uses RegressionTrees as a part of its procedure.
Now i'm getting an exception in the mex file of the regression tree.
here is a part of the crash dump
------------------------------------------------------------------------
Segmentation violation detected at Tue Jun 4 11:49:48 2013
------------------------------------------------------------------------
Configuration:
Crash Decoding : Disabled
Current Visual : 0x21 (class 4, depth 24)
Default Encoding : UTF-8
GNU C Library : 2.13 stable
MATLAB Architecture: glnxa64
MATLAB Root : /usr/local/MATLAB/R2013a
MATLAB Version : 8.1.0.604 (R2013a)
Operating System : Linux 3.0.0-31-generic #49-Ubuntu SMP Tue Feb 19 20:02:57 UTC 2013 x86_64
Processor ID : x86 Family 6 Model 42 Stepping 7, GenuineIntel
Virtual Machine : Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) 64-Bit Server VM mixed mode
Window System : The X.Org Foundation (11004000), display :0
Fault Count: 1
Abnormal termination:
Segmentation violation
Register State (from fault):
RAX = 000000000a673ad8 RBX = 0000000008c85de8
RCX = 0000000000000000 RDX = 00000000000002a5
RSP = 00007f5fa88ba8e0 RBP = 00007f5fa88ba910
RSI = 0000000008c85de8 RDI = 0000000008c825a0
R8 = 0000000008c825a0 R9 = 0000000000003870
R10 = 0000000000003001 R11 = ffefffffffffffff
R12 = 0000000008c83ac0 R13 = 0000000008c83ac8
R14 = 00007f5fa88ba930 R15 = 0000000000000119
RIP = 00007f5f7a06e9fd EFL = 0000000000010246
CS = 0033 FS = 0000 GS = 0000
Stack Trace (from fault):
[ 0] 0x00007f5f7a06e9fd /usr/local/MATLAB/R2013a/toolbox/stats/classreg/+classreg/+learning/+treeutils/growTree.mexa64+00088573 _ZSt9__find_ifIN9__gnu_cxx17__normal_iteratorIPmSt6vectorImSaImEEEEN12classregtree12IndexedIsNaNIdEEET_SA_SA_T0_St26random_access_iterator_tag+00000077
[ 1] 0x00007f5f7a06eb29 /usr/local/MATLAB/R2013a/toolbox/stats/classreg/+classreg/+learning/+treeutils/growTree.mexa64+00088873 _ZSt9remove_ifIN9__gnu_cxx17__normal_iteratorIPmSt6vectorImSaImEEEEN12classregtree12IndexedIsNaNIdEEET_SA_SA_T0_+00000041
[ 2] 0x00007f5f7a085f20 /usr/local/MATLAB/R2013a/toolbox/stats/classreg/+classreg/+learning/+treeutils/growTree.mexa64+00184096
[ 3] 0x00007f5f7a0cf25b /usr/local/MATLAB/R2013a/toolbox/stats/classreg/+classreg/+learning/+treeutils/growTree.mexa64+00483931
[ 4] 0x00007f5f7a0d0580 /usr/local/MATLAB/R2013a/toolbox/stats/classreg/+classreg/+learning/+treeutils/growTree.mexa64+00488832
[ 5] 0x00007f5f7a0eb2c6 /usr/local/MATLAB/R2013a/toolbox/stats/classreg/+classreg/+learning/+treeutils/growTree.mexa64+00598726
[ 6] 0x00007f5f7a0698a3 /usr/local/MATLAB/R2013a/toolbox/stats/classreg/+classreg/+learning/+treeutils/growTree.mexa64+00067747 mexFunction+00001939
[ 7] 0x00007f5fb2a1bf8a /usr/local/MATLAB/R2013a/bin/glnxa64/libmex.so+00110474 mexRunMexFile+00000090
[ 8] 0x00007f5fb2a180f9 /usr/local/MATLAB/R2013a/bin/glnxa64/libmex.so+00094457
[ 9] 0x00007f5fb2a18f1c /usr/local/MATLAB/R2013a/bin/glnxa64/libmex.so+00098076
[ 10] 0x00007f5fbc2ac6b2 /usr/local/MATLAB/R2013a/bin/glnxa64/libmwm_dispatcher.so+00562866 _ZN8Mfh_file11dispatch_fhEiPP11mxArray_tagiS2_+00000594
[ 11] 0x00007f5fb2ff453a /usr/local/MATLAB/R2013a/bin/glnxa64/libmwmcos.so+01672506
[ 12] 0x00007f5fb2f9513a /usr/local/MATLAB/R2013a/bin/glnxa64/libmwmcos.so+01282362
[ 13] 0x00007f5fb2f953be /usr/local/MATLAB/R2013a/bin/glnxa64/libmwmcos.so+01283006
[ 14] 0x00007f5fb2f9712c /usr/local/MATLAB/R2013a/bin/glnxa64/libmwmcos.so+01290540
[ 15] 0x00007f5fb3002246 /usr/local/MATLAB/R2013a/bin/glnxa64/libmwmcos.so+01729094
[ 16] 0x00007f5fb3081cd8 /usr/local/MATLAB/R2013a/bin/glnxa64/libmwmcos.so+02251992
[ 17] 0x00007f5fbc25eaf8 /usr/local/MATLAB/R2013a/bin/glnxa64/libmwm_dispatcher.so+00244472 _ZN13Mfh_MATLAB_fn11dispatch_fhEiPP11mxArray_tagiS2_+00000488
[ 18] 0x00007f5fbbb4a256 /usr/local/MATLAB/R2013a/bin/glnxa64/libmwm_interpreter.so+02245206
[ 19] 0x00007f5fbbafaa86 /usr/local/MATLAB/R2013a/bin/glnxa64/libmwm_interpreter.so+01919622
...
...
The complete crash dump http://snipt.org/AlK6
Now how can i know if my whether my input to the regression Tree is causing an error or it is something related to my hardware ?
is There a way to know the reason of the error ?
UPDATE
here are the lines that cause the exception (the Regression Tree line is the main reason)
for j = 1:J
save('data');
gj = RegressionTree.fit(trainData, Y_CODE(:, j), 'Weights', wts);
g{j} = gj;
end
This code snippet is a part of a loop (actually i'm trying to implement GAMBLE algorithm, if you know an existing implementation that would be great), and matlab crashes everytime in a different iteration..
I have tried to save the workspace save('data') and re-execute the regression tree line after restarting matlab but it didn't crash .. which is very strange.
i have sent a crash report to MathWorks.
meanwhile is there a matlab implementation of Regression Trees that supports weights ? or better an implementation of the GAMBLE boosting algorithm ?
Thanks

Answer 1

As long as you're running on a system that meets the published MATLAB system requirements, no MathWorks code should really be giving you a segmentation violation like this - whatever input you are passing into it. Even if you're passing in complete nonsense, it should stop gracefully with a MATLAB error, not a hard fault like this.
If you can reproduce the behaviour (in a freshly started MATLAB, nothing else running, with the same inputs each time), contact MathWorks support to either discover whether an aspect of your system is unsupported, or to report a bug.