Segfaults with double precision tuning on Fiji

[ghost]

Calling clblast_xgemm_tuner with -platform 0 -device 0 -precision 64 (double) -m 1024 [=default] -n 1024 [=default] -k 1024 [=default] -alpha 2.000000 [=default] -beta 2.000000 [=default] -fraction 512.000000
results in a SIGSEGV. I think there was a issue that was filed earlier that indicated that the cause of such segfaults was to be found in the driver. I'm currently usingCatalyst 15.12 with a R9 Nano.

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Reading symbols from ./clblast_tuner_xgemm...(no debugging symbols found)...done.
(gdb) run -platform 0 -device 0 -precision 64 -m 1024 -n 1024 -k 1024 -alpha 2.00000 -beta 2.00000 -fraction 512.00000 
Starting program: /home/neptune/devel/clblast/build/clblast_tuner_xgemm -platform 0 -device 0 -precision 64 -m 1024 -n 1024 -k 1024 -alpha 2.00000 -beta 2.00000 -fraction 512.00000
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
* Options given/available:
    -platform 0 [=default]
    -device 0 [=default]
    -precision 64 (double) 
    -m 1024 [=default]
    -n 1024 [=default]
    -k 1024 [=default]
    -alpha 2.000000 [=default]
    -beta 2.000000 [=default]
    -fraction 512.000000 

Error: No root privilege. Please check with the system-admin.
Error: No root privilege. Please check with the system-admin.
[New Thread 0x7fffed6dc700 (LWP 8540)]

[==========] Initializing on platform 0 device 0
[==========] Device name: 'Fiji' (OpenCL 2.0 AMD-APP (1912.5))

[----------] Testing reference Xgemm
[ RUN      ] Running Xgemm
[       OK ] Completed Xgemm (10.9 ms) - 1 out of 1

[----------] Testing kernel Xgemm
[ RUN      ] Running Xgemm
[       OK ] Completed Xgemm (5.7 ms) - 1 out of 1

[----------] Printing results to stdout
[ RESULT   ] Xgemm;      5.7 ms;   MWG 32;   NWG 64;   KWG 32; MDIMC 32;  NDIMC 8; MDIMA 32;  NDIMB 8;    KWI 2;    VWM 1;    VWN 2;   STRM 0;   STRN 0;     SA 1;     SB 1;PRECISION 64;

[----------] Printing best result to stdout
[     BEST ] Xgemm;      5.7 ms;   MWG 32;   NWG 64;   KWG 32; MDIMC 32;  NDIMC 8; MDIMA 32;  NDIMB 8;    KWI 2;    VWM 1;    VWN 2;   STRM 0;   STRN 0;     SA 1;     SB 1;PRECISION 64;

[----------] Printing best result in database format to stdout
{ "Fiji", { {"MWG",32}, {"NWG",64}, {"KWG",32}, {"MDIMC",32}, {"NDIMC",8}, {"MDIMA",32}, {"NDIMB",8}, {"KWI",2}, {"VWM",1}, {"VWN",2}, {"STRM",0}, {"STRN",0}, {"SA",1}, {"SB",1}, {"PRECISION",64} } }
[ -------> ] 5.7 ms or 375.0 GFLOPS

[----------] Printing results to file in JSON format

[==========] End of the tuning process

[Thread 0x7fffed6dc700 (LWP 8540) exited]
* Options given/available:
    -platform 0 [=default]
    -device 0 [=default]
    -precision 64 (double) 
    -m 1024 [=default]
    -n 1024 [=default]
    -k 1024 [=default]
    -alpha 2.000000 [=default]
    -beta 2.000000 [=default]
    -fraction 512.000000 [=default]

[New Thread 0x7fffed6dc700 (LWP 8550)]

[==========] Initializing on platform 0 device 0
[==========] Device name: 'Fiji' (OpenCL 2.0 AMD-APP (1912.5))

[----------] Testing reference Xgemm
[ RUN      ] Running Xgemm
[       OK ] Completed Xgemm (10.9 ms) - 1 out of 1

[----------] Testing kernel Xgemm
[ RUN      ] Running Xgemm
[       OK ] Completed Xgemm (6.6 ms) - 1 out of 213
[ RUN      ] Running Xgemm
[       OK ] Completed Xgemm (7.8 ms) - 2 out of 213
[ RUN      ] Running Xgemm
[       OK ] Completed Xgemm (7.3 ms) - 3 out of 213
[ RUN      ] Running Xgemm
[       OK ] Completed Xgemm (7.9 ms) - 4 out of 213
[ RUN      ] Running Xgemm
[       OK ] Completed Xgemm (6.3 ms) - 5 out of 213
[ RUN      ] Running Xgemm
[       OK ] Completed Xgemm (10.8 ms) - 6 out of 213

Thread 1 "clblast_tuner_x" received signal SIGSEGV, Segmentation fault.
0x00007ffff32509be in ?? () from /usr/lib/libamdocl64.so
(gdb) backtrace
#0  0x00007ffff32509be in ?? () from /usr/lib/libamdocl64.so
#1  0x00007ffff325e5b4 in ?? () from /usr/lib/libamdocl64.so
#2  0x00007ffff325fdfa in ?? () from /usr/lib/libamdocl64.so
#3  0x00007ffff3260b9b in ?? () from /usr/lib/libamdocl64.so
#4  0x00007ffff2e56b80 in ?? () from /usr/lib/libamdocl64.so
#5  0x00007ffff2e5a7f4 in ?? () from /usr/lib/libamdocl64.so
#6  0x00007ffff2e5afc1 in ?? () from /usr/lib/libamdocl64.so
#7  0x00007ffff320c195 in ?? () from /usr/lib/libamdocl64.so
#8  0x00007fffef3760d7 in amdcl::scCompileSIImpl::CompileOnce(amdcl::_il_binary_rec&, unsigned long&) () from /usr/lib/libamdocl12cl64.so
#9  0x00007fffef37610d in amdcl::scCompileSI::Compile(amdcl::_il_binary_rec&, unsigned long&) () from /usr/lib/libamdocl12cl64.so
#10 0x00007fffef379992 in amdcl::AMDIL::assemble(amdcl::_il_binary_rec*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, amdcl::scCompileBase*) ()
   from /usr/lib/libamdocl12cl64.so
#11 0x00007fffef37a7cd in amdcl::AMDIL::compile(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, amdcl::scCompileBase*) () from /usr/lib/libamdocl12cl64.so
#12 0x00007fffef379070 in amdcl::AMDIL::compile(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) () from /usr/lib/libamdocl12cl64.so
#13 0x00007fffeee96ab4 in AMDILFEToISA(_acl_loader_data_0_8**, char const*, unsigned long) () from /usr/lib/libamdocl12cl64.so
#14 0x00007fffeee988b5 in if_aclCompile(_acl_compiler_rec_0_8_1*, _acl_bif_rec_0_8_1*, char const*, _acl_type_enum_0_8, _acl_type_enum_0_8, void (*)(char const*, unsigned long)) ()
   from /usr/lib/libamdocl12cl64.so
#15 0x00007ffff338c5d9 in aclCompile () from /usr/lib/libamdocl64.so
#16 0x00007ffff2a5c0e8 in ?? () from /usr/lib/libamdocl64.so
#17 0x00007ffff2a5c760 in ?? () from /usr/lib/libamdocl64.so
#18 0x00007ffff2a6b112 in ?? () from /usr/lib/libamdocl64.so
#19 0x00007ffff2a6d92a in ?? () from /usr/lib/libamdocl64.so
#20 0x00007ffff2a1ab4f in ?? () from /usr/lib/libamdocl64.so
#21 0x00007ffff2a2a8ec in ?? () from /usr/lib/libamdocl64.so
#22 0x00007ffff2a0b9d0 in clBuildProgram () from /usr/lib/libamdocl64.so
#23 0x00007ffff77b83a3 in cltune::TunerImpl::RunKernel(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cltune::KernelInfo const&, unsigned long, unsigned long) () from /usr/lib/libcltune.so
#24 0x00007ffff77ba661 in cltune::TunerImpl::Tune() () from /usr/lib/libcltune.so
#25 0x000000000042cd49 in void clblast::Tuner<clblast::TuneXgemm<double, 2>, double>(int, char**) ()
#26 0x000000000040c9aa in main ()

[CNugteren]

Are you testing on the development branch? Perhaps that fixes some issues already. Furthermore, I would suggest not to give the -fraction argument, such that the first set of tuning tests will run fully (those are the most likely parameters to yield good results anyway).

[ghost]

I was testing on master, but a similar error shows up even on development. It looks like it's segfaulting inside the compiler.

[MigMuc]

I don't know if the errors I get tuning the Xgemm with double precision are related to the above mentioned problem, but I will post it here first.
`[ RUN ] Running Xgemm
[ OK ] Completed Xgemm (25.6 ms) - 167 out of 213
device compiler error/warning: Error:E012:Insufficient Local Resources!

[ FAILED ] Kernel Xgemm failed
[ FAILED ] catched exception: device compiler error/warning occurred

[ FAILED ] Xgemm; 0.0 ms; MWG 32; NWG 128; KWG 32; MDIMC 16; NDIMC 16; MDIMA 32; NDIMB 16; KWI 2; VWM 1; VWN 4; STRM 0; STRN 1; SA 1; SB 1;PRECISION 64;
[ RUN ] Running Xgemm
[ OK ] Completed Xgemm (17.0 ms) - 169 out of 213 `

Maybe it is related to the driver but compared with the version above my version is:
Device name: 'Tonga' (OpenCL 2.0 AMD-APP (1800.8))

There is one thread related to this error at the khronos forums.

[CNugteren]

Is this still an issue with the latest AMD compilers? And do you think it is related to CLBlast at all?

[ghost]

I haven't seen updates to catalyst, so this should still be true.

[MigMuc]

In this thread clMathLibraries/clBLAS#207 there is a solution to the issue you are describing. I managed to get thinks working after linking against libOpenCL provided by the driver NOT by the AMD APP.

[CNugteren]

Are you sure that issue is related? Also, you two might be discussing different issues: @akssri can you try @MigMuc's suggestion and link to a different libOpenCL and see if that works?

Still I think AMD's compiler shouldn't segfault, so it is probably a good idea to report this to AMD.

[ghost]

@MigMuc libOpenCL is currently only being provided by AMDAPP on my machine. It looks like the bug for clMathLibraries/clBLAS#207 has something to do with multiple CPU threads ?

@CNugteren Yes, this should definitely be AMDs task to fix; feel free to close this (or perhaps add some archival flag). I'll try to dump the kernel that is causing this issue and file a bug report with AMD.