Re: [Starpu-devel] starpu opencl app

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

HEllo,

Bogdan Manciu, le Fri 19 Oct 2012 17:11:34 +0300, a écrit :
> it segfaults on starpu_opencl_load_kernel( refocusing_starpu.c line 127 )
> and I can't figure out why/what to do about it.

Program received signal SIGSEGV, Segmentation fault.
__strcpy_ssse3 () at ../sysdeps/x86_64/multiarch/strcpy.S:94
94      ../sysdeps/x86_64/multiarch/strcpy.S: Aucun fichier ou dossier de ce 
type.
(gdb) bt
#0  __strcpy_ssse3 () at ../sysdeps/x86_64/multiarch/strcpy.S:94
#1  0x00007ffff7b69d6b in _starpu_opencl_compile_or_load_opencl_from_file 
(source_file_name=0x405fef "refocusing_opencl_kernel.cl", 
    opencl_programs=0x632c60, build_options=0x0) at 
drivers/opencl/driver_opencl_utils.c:371
#2  0x00000000004048d5 in refocusing_starpu (h_dst=0x677220, 
h_src=0x7ffff7fc4010, ld=230, width=230, height=230, depth=6, xoffset=0, 
    yoffset=0, verbose=0) at refocusing_starpu.c:247
#3  0x0000000000402bfa in main (argc=1, argv=0x7fffffffdc58) at main.c:99
(gdb) up
#1  0x00007ffff7b69d6b in _starpu_opencl_compile_or_load_opencl_from_file 
(source_file_name=0x405fef "refocusing_opencl_kernel.cl", 
    opencl_programs=0x632c60, build_options=0x0) at 
drivers/opencl/driver_opencl_utils.c:371
371                     strcpy(new_build_options, build_options);
(gdb) p build_options
$1 = 0x0

so it seems it is simply because you pass NULL for build_options.
Putting "" there makes it go further.  I guess we could handle NULL as
being "".

Now it fails further away:

oops in refocusing_opencl_codelet (refocusing_starpu.c:146) ((null)) ... 
<Invalid value> (-30) 
refocusing: /usr/local/stow/starpu/include/starpu/1.0/starpu_opencl.h:43: 
starpu_opencl_report_error: Assertion `0' failed.

This is

        err = clEnqueueWriteImage(queue, d_tex, CL_TRUE,  origin, region, 
width*sizeof(float), 0, (void *) d_src, 0, NULL, NULL);
        if (err != CL_SUCCESS) STARPU_OPENCL_REPORT_ERROR(err);

I don't see anything obviously wrong here, but I don't know
clEnqueueWriteImage very much.

Samuel