Hello All,
I have recently been testing my OpenCL code on an AMD HD7970 GPU, and some of my kernels are causing the compiler to crash with a segmentation fault at clBuildProgram() . I would like to mention that the kernels compile and run fine on any NVIDIA device, and on CPU with AMD SDK.
Information about my system:
Description: Debian GNU/Linux 6.0.1 (squeeze)
Arch: x86_64
CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+
GPU: AMD HD7970
AMD OpenCL SDK: 2.8
Driver: AMD Catalyst proprietary driver 12.10
Here are the back traces given by GDB for the 2 kernels that produce the segmentation fault. I would like to mention that these are ~400 lines long kernels, with many nested 'for' loops, and requiring a fairly large amount of private memory.
back trace for kernel 1:
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff49a1b88 in SCRegSpill::CreateReload(SCInst*, int, SCInst*, SCBlock*, bitset*, bitset*, int) () from /usr/lib/libamdocl64.so
(gdb) bt
#0 0x00007ffff49a1b88 in SCRegSpill::CreateReload(SCInst*, int, SCInst*, SCBlock*, bitset*, bitset*, int) () from /usr/lib/libamdocl64.so
#1 0x00007ffff49b2533 in SCRegSpill::Spill() () from /usr/lib/libamdocl64.so
#2 0x00007ffff49b5160 in SCRegAlloc::Allocate(bool) () from /usr/lib/libamdocl64.so
#3 0x00007ffff49b54af in SCRegAlloc::AllocateRegisters() () from /usr/lib/libamdocl64.so
#4 0x00007ffff45b0b5f in CompilerBase::GenerateCodeUsingNewIR(void*, bool) () from /usr/lib/libamdocl64.so
#5 0x00007ffff45b6764 in Compiler::Compile(ILProgram*) () from /usr/lib/libamdocl64.so
#6 0x00007ffff45b6ee0 in Compiler::CompileShader(unsigned char*, unsigned char*, unsigned int const*, CompilerExternal*) ()
from /usr/lib/libamdocl64.so
#7 0x00007ffff45b3227 in CompilerExternal::CompileShader(_SC_SRCSHADER const*, _SC_HWSHADER*) () from /usr/lib/libamdocl64.so
#8 0x00007ffff49cffc2 in scWrapCompileBinarySI(void*, unsigned int, void**, unsigned int*, unsigned int, unsigned int, scWrapOptionEnum*)
() from /usr/lib/libamdocl64.so
#9 0x00007ffff458df6b in amuCompCompile () from /usr/lib/libamdocl64.so
#10 0x00007ffff458ecee in ddiCompile () from /usr/lib/libamdocl64.so
#11 0x00007ffff44cb91e in gpu::NullKernel::create(stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, void const*, unsigned long) ()
from /usr/lib/libamdocl64.so
#12 0x00007ffff44d05d3 in gpu::Kernel::create(stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, void const*, unsigned long) ()
from /usr/lib/libamdocl64.so
#13 0x00007ffff44df058 in gpu::Program::createKernel(stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, gpu::Kernel::InitData const*, stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, bool*, void const*, unsigned long) ()
from /usr/lib/libamdocl64.so
#14 0x00007ffff44de2ca in gpu::NullProgram::linkImpl(amd::option::Options*) () from /usr/lib/libamdocl64.so
#15 0x00007ffff4479055 in device::Program::build(stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, char const*, amd::option::Options*) () from /usr/lib/libamdocl64.so
#16 0x00007ffff4489030 in amd::Program::build(stlp_std::vector<amd::Device*, stlp_std::allocator<amd::Device*> > const&, char const*, void (*)(_cl_program*, void*), void*, bool) () from /usr/lib/libamdocl64.so
#17 0x00007ffff4466ff3 in clBuildProgram () from /usr/lib/libamdocl64.so
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
back trace for kernel 2:
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff4936199 in SC_SCCGCM::GetEarly(SCInst*) () from /usr/lib/libamdocl64.so
(gdb) bt
#0 0x00007ffff4936199 in SC_SCCGCM::GetEarly(SCInst*) () from /usr/lib/libamdocl64.so
#1 0x00007ffff49363a4 in SC_SCCGCM::ComputeEarlyPosition(SCInst*, FuncRegion*) () from /usr/lib/libamdocl64.so
#2 0x00007ffff49c5848 in SC_SCCGVN::GVNSCCInst(SCInst*, SC_SCCVN*) () from /usr/lib/libamdocl64.so
#3 0x00007ffff49c7704 in SCCVNBase<SCInst, SC_CurrentValue>::VNSCCInst(SCInst*) () from /usr/lib/libamdocl64.so
#4 0x00007ffff49c6ff5 in SC_SCCBLK::VNSCCItem(int) () from /usr/lib/libamdocl64.so
#5 0x00007ffff49c7a97 in void SCCVNBase<SCInst, SC_CurrentValue>::ProcessSCC<SC_SCCBLK>(SC_SCCBLK*, int) () from /usr/lib/libamdocl64.so
#6 0x00007ffff4938a5f in SCC_BASE<SCBlock>::SCC(SCBlock*) () from /usr/lib/libamdocl64.so
#7 0x00007ffff49c69ad in SC_SCCBLK::Traversal() () from /usr/lib/libamdocl64.so
#8 0x00007ffff45b07d3 in CompilerBase::GenerateCodeUsingNewIR(void*, bool) () from /usr/lib/libamdocl64.so
#9 0x00007ffff45b6764 in Compiler::Compile(ILProgram*) () from /usr/lib/libamdocl64.so
#10 0x00007ffff45b6ee0 in Compiler::CompileShader(unsigned char*, unsigned char*, unsigned int const*, CompilerExternal*) ()
from /usr/lib/libamdocl64.so
#11 0x00007ffff45b3227 in CompilerExternal::CompileShader(_SC_SRCSHADER const*, _SC_HWSHADER*) () from /usr/lib/libamdocl64.so
#12 0x00007ffff49cffc2 in scWrapCompileBinarySI(void*, unsigned int, void**, unsigned int*, unsigned int, unsigned int, scWrapOptionEnum*)
() from /usr/lib/libamdocl64.so
#13 0x00007ffff458df6b in amuCompCompile () from /usr/lib/libamdocl64.so
#14 0x00007ffff458ecee in ddiCompile () from /usr/lib/libamdocl64.so
#15 0x00007ffff44cb91e in gpu::NullKernel::create(stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, void const*, unsigned long) ()
from /usr/lib/libamdocl64.so
#16 0x00007ffff44d05d3 in gpu::Kernel::create(stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, void const*, unsigned long) ()
from /usr/lib/libamdocl64.so
#17 0x00007ffff44df058 in gpu::Program::createKernel(stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, gpu::Kernel::InitData const*, stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, bool*, void const*, unsigned long) ()
from /usr/lib/libamdocl64.so
#18 0x00007ffff44de2ca in gpu::NullProgram::linkImpl(amd::option::Options*) () from /usr/lib/libamdocl64.so
#19 0x00007ffff4479055 in device::Program::build(stlp_std::basic_string<char, stlp_std::char_traits<char>, stlp_std::allocator<char> > const&, char const*, amd::option::Options*) () from /usr/lib/libamdocl64.so
#20 0x00007ffff4489030 in amd::Program::build(stlp_std::vector<amd::Device*, stlp_std::allocator<amd::Device*> > const&, char const*, void (*)(_cl_program*, void*), void*, bool) () from /usr/lib/libamdocl64.so
#21 0x00007ffff4466ff3 in clBuildProgram () from /usr/lib/libamdocl64.so
The kernel code is proprietary code so I cannot post it on this forum, but I accept sending it to the AMD compiler dev team if need be. Please get in touch if you would like me to do so.
Regards,
Simon
