Segfault on Linux.

[tuanpham91]

Hi if this is a duplicate, please remove.

I installed oclgrind with the command (sudo apt-get oclgrind..) and have clang-3.9. When I am trying to run my code i got this :

/usr/bin/oclgrind: line 145: 13792 Segmentation fault (core dumped) LD_LIBRARY_PATH=$LIBDIR:$LD_LIBRARY_PATH LD_PRELOAD=$LIBDIR/liboclgrind-rt.so "$@"

My opencl program runs fine in my IDE.

Thanks.

[jrprice]

Does Oclgrind work with any other simple OpenCL codes? For example, does it work with clinfo (which can be installed via apt-get)?

[tuanpham91]

I just tested with a simple OpenCL program and it worked. What do you mean by "does it work with clinfo" ? Anyway, is the problem caused by my program ?

[jrprice]

clinfo was just an example of a simple OpenCL program, but if you've tried another and it works then that is fine - I just wanted to check whether Oclgrind was completely broken or not.

Is your source code available somewhere for me to try and reproduce the crash? Failing that, are you able to provide a backtrace for the crash (from gdb for example)?

[tuanpham91]

Hi, i cant provide you the code, only the stack trace. It shows nothing :

[tuanpham91]

Hi,

The problem was an array out of bound error in my program. If you dont mind, can you explain how should i read this error produced by oclgrind ?

What does "Entity" and the next line means ?

If you have a doc about that, please let me know.

Thanks and have a good day!

[jrprice]

The entity in this case is a work-item, so Oclgrind is showing you that the work-item with global ID (0,1,0) is reading memory that it shouldn't, from one of the arrays in global memory listed on the last line.

The %168 = load ... line is the SPIR/LLVM instruction that is being executed - this is usually only useful for people working at the compiler level so you can probably just ignore.

[tuanpham91]

Thanks for your help !