# LIBSVM crashes after sucessfully running a few times

**URL:** <https://discourse.julialang.org/t/libsvm-crashes-after-sucessfully-running-a-few-times/42047>\
**Category:** Machine Learning\
**Tags:** question\
**Created:** [June 25, 2020, 4:03pm UTC](https://discourse.julialang.org/t/libsvm-crashes-after-sucessfully-running-a-few-times/42047 "2020-06-25T16:03:45Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![rio](https://avatars.discourse-cdn.com/v4/letter/r/ea666f/32.png) [@rio](https://discourse.julialang.org/u/rio)\
**Post date:** [June 25, 2020, 4:03pm UTC](https://discourse.julialang.org/t/libsvm-crashes-after-sucessfully-running-a-few-times/42047/1 "2020-06-25T16:03:45Z")

</div>

Hi,

I am using LIBSVM.jl to train a SVM classification model. Apparently the model in my code below trains successfully. However, after running it a few times it crashes (after about 10 repetitions). It shows a segmentation fault message. Please, how could I fix it?

```julia
using Random;using LIBSVM

Random.seed!(1)
nSamples = 200;nFeatures = 150

x = rand(nFeatures,nSamples)
y = ceil.(Int,10*x[end,:])

for repeat = 1:500
    C = repeat + 0.0
    model = svmtrain(x, y; kernel=LIBSVM.Kernel.Linear, cost=C);
    y_hat, decision_values = svmpredict(model, x);
    @info(" $repeat: C = $C correclty classified $(sum(y_hat.==y))")
end

```

I am using LIBSVM v0.4.0, Atom v0.12.15, and macos. Many thanks!

---

<div class="post-metadata">

**Author:** ![rio](https://avatars.discourse-cdn.com/v4/letter/r/ea666f/32.png) [@rio](https://discourse.julialang.org/u/rio)\
**Post date:** [June 29, 2020, 1:25am UTC](https://discourse.julialang.org/t/libsvm-crashes-after-sucessfully-running-a-few-times/42047/2 "2020-06-29T01:25:52Z")

</div>

the code above fails with the message:

```julia
signal (11): Segmentation fault: 11
in expression starting at untitled-272beec863a1ee69770658e2a832c62a:9
_ZN6Kernel3dotEPK8svm_nodeS2_ at /Users/rio/.julia/packages/LIBSVM/5Z99T/deps/libsvm.so.2 (unknown line)
_ZN6Kernel10k_functionEPK8svm_nodeS2_RK13svm_parameter at /Users/rio/.julia/packages/LIBSVM/5Z99T/deps/libsvm.so.2 (unknown line)
svm_predict_values at /Users/rio/.julia/packages/LIBSVM/5Z99T/deps/libsvm.so.2 (unknown line)
#svmpredict#4 at /Users/rio/.julia/packages/LIBSVM/5Z99T/src/LIBSVM.jl:435
svmpredict at /Users/rio/.julia/packages/LIBSVM/5Z99T/src/LIBSVM.jl:402
top-level scope at ./untitled-272beec863a1ee69770658e2a832c62a:12
jl_toplevel_eval_flex at /Users/julia/buildbot/worker/package_macos64/build/src/toplevel.c:808
jl_parse_eval_all at /Users/julia/buildbot/worker/package_macos64/build/src/ast.c:872
include_string at ./loading.jl:1080
#220 at /Users/rio/.julia/packages/Atom/8MnXm/src/eval.jl:174
withpath at /Users/rio/.julia/packages/CodeTools/kosGY/src/utils.jl:30
withpath at /Users/rio/.julia/packages/Atom/8MnXm/src/eval.jl:9
#219 at /Users/rio/.julia/packages/Atom/8MnXm/src/eval.jl:171 [inlined]
with_logstate at ./logging.jl:398
with_logger at ./logging.jl:505 [inlined]
#218 at /Users/rio/.julia/packages/Atom/8MnXm/src/eval.jl:170 [inlined]
hideprompt at /Users/rio/.julia/packages/Atom/8MnXm/src/repl.jl:127
macro expansion at /Users/rio/.julia/packages/Media/ItEPc/src/dynamic.jl:24 [inlined]
evalall at /Users/rio/.julia/packages/Atom/8MnXm/src/eval.jl:160
jl_apply at /Users/julia/buildbot/worker/package_macos64/build/src/./julia.h:1700 [inlined]
do_apply at /Users/julia/buildbot/worker/package_macos64/build/src/builtins.c:643
jl_f__apply at /Users/julia/buildbot/worker/package_macos64/build/src/builtins.c:657 [inlined]
jl_f__apply_latest at /Users/julia/buildbot/worker/package_macos64/build/src/builtins.c:693
#invokelatest#1 at ./essentials.jl:712
jl_apply at /Users/julia/buildbot/worker/package_macos64/build/src/./julia.h:1700 [inlined]
do_apply at /Users/julia/buildbot/worker/package_macos64/build/src/builtins.c:643
invokelatest at ./essentials.jl:711
jl_apply at /Users/julia/buildbot/worker/package_macos64/build/src/./julia.h:1700 [inlined]
do_apply at /Users/julia/buildbot/worker/package_macos64/build/src/builtins.c:643
macro expansion at /Users/rio/.julia/packages/Atom/8MnXm/src/eval.jl:41 [inlined]
#188 at ./task.jl:358
unknown function (ip: 0x11cd85dcc)
jl_apply at /Users/julia/buildbot/worker/package_macos64/build/src/./julia.h:1700 [inlined]
start_task at /Users/julia/buildbot/worker/package_macos64/build/src/task.c:687
Allocations: 39608856 (Pool: 39597378; Big: 11478); GC: 42

```

Any help would be greatly appreciated