topic Hi, in Intel® oneAPI Math Kernel Library

Invalid read of size 4 in mkl_serv_malloc

erling_andersen — Fri, 25 Oct 2013 12:02:43 GMT

We have a crash in MKLon Intel 64x86 using Intel 13.1.3. It is both from valgrind and gdb. We use

mkl_disable_fast_mm();

So it seems the buffer stuff should never be allocated. Well, I am not sure but the buffer stuff seems in use.

Any suggestions, comments?

[My application which is a .so linked with a static version version of MKL into a MATLAB mex file. A MATLAB mex file is also a so it is called from MATLAB. Now MATLAB is is linked with MKL but another version and the shared lib. The crash above only pops up if called from MATLAB. Maybe this is a special situation you have not considered.]

The stacj trace should come here but your spam filer prevented me from adding it.

I cannot paste the stack

erling_andersen — Fri, 25 Oct 2013 12:05:29 GMT

I cannot paste the stack trace becuse of the spam filer but it is attached

We are using composer_xe

erling_andersen — Fri, 25 Oct 2013 13:08:54 GMT

We are using composer_xe_2013.5.192

Hi,

Dmitry_B_Intel — Mon, 28 Oct 2013 04:13:35 GMT

Hi,

Could you print and paste here the parameters you pass to cblas_dgemm in MSK_INTEL_P4_mathenv_gemm (mathenvcpu.c:2293) ? That would help us to reproduce the issue.

Thanks
Dima

I have spend more time

erling_andersen — Mon, 28 Oct 2013 08:50:09 GMT

I have spend more time rsearching the issue. It seems

The problem is independent of the matrix sizes.
The problem occurs in the first call to dgemm. I moved the call to dgemm to begning of my program. To reduce the risk I overwrote the your data. It still occurs.

So the problem seems to be related to initialization of perhaps your intial data structures. Does that help. We link static as I mentioned.

I might be able to create an example but it will require you can run MATLAB r2013a on linux64x86. Is that of interest?

I also tried linking with

erling_andersen — Mon, 28 Oct 2013 10:49:17 GMT

I also tried linking with libmkl_sequential.so and then the problem also goes away.

However, I REALLY HATE that solution because distributing more shared libraries is a major PAIN. Also I had to set LD_PRELOAD to get it working which is major PAIN too.

I have reported a test case

erling_andersen — Tue, 29 Oct 2013 09:41:37 GMT

I have reported a test case in http://software.intel.com/en-us/forums/topic/486842

Thanks. I will check in that

Chao_Y_Intel — Wed, 30 Oct 2013 02:48:10 GMT

Thanks. I will check in that one.