Segmentation fault with cpu_selector, works with default and gpu.

Dmitry_Savin — Tue, 14 Jan 2020 19:49:44 GMT

An application https://gitlab.com/miptitep/syclbrot adapted from https://gitlab.com/VileLasagna/toyBrot compiles with the dpcpp and runs if the default selector is used (2de42a2009e3833e0631d2eb8e11266548ad7813) but fails with the cpu_selector (236bbf18ce65e9708ce1811fe25b55c2a6838b44). Reproduced in the DevCloud. Also works with the gpu_selector (now commit SHA, see the diff between the two and substitute accordingly). The error message emerges at the start of the compiled application: Running on Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz > Stack dump: > 0. Running pass 'Function Pass Manager' on module 'main'. > 1. Running pass 'VPlan Vectorization Driver' on function '' > Segmentation fault (core dumped) The stack trace obtained under Valgrind: Process terminating with default action of signal 11 (SIGSEGV) General Protection Fault at 0x2066129B: llvm::Constant::getAllOnesValue(llvm::Type*) (in /opt/intel/inteloneapi/compiler/2021.1-beta03/linux/lib/x64/libOclCpuBackEnd.so.2019.9.11.0) by 0x206612B9: llvm::Constant::getAllOnesValue(llvm::Type*) (in /opt/intel/inteloneapi/compiler/2021.1-beta03/linux/lib/x64/libOclCpuBackEnd.so.2019.9.11.0) by 0x206612B9: llvm::Constant::getAllOnesValue(llvm::Type*) (in /opt/intel/inteloneapi/compiler/2021.1-beta03/linux/lib/x64/libOclCpuBackEnd.so.2019.9.11.0) by 0x20664BCB: llvm::ConstantExpr::getNot(llvm::Constant*) (in /opt/intel/inteloneapi/compiler/2021.1-beta03/linux/lib/x64/libOclCpuBackEnd.so.2019.9.11.0) by 0x20B22E34: llvm::vpo::VPOCodeGen::vectorizeInstruction(llvm::vpo::VPInstruction*) (in /opt/intel/inteloneapi/compiler/2021.1-beta03/linux/lib/x64/libOclCpuBackEnd.so.2019.9.11.0) by 0x20B43E54: llvm::vpo::VPInstruction::execute(llvm::vpo::VPTransformState&) (in /opt/intel/inteloneapi/compiler/2021.1-beta03/linux/lib/x64/libOclCpuBackEnd.so.2019.9.11.0) by 0x20B4839D: llvm::vpo::VPBasicBlock::execute(llvm::vpo::VPTransformState*) (in /opt/intel/inteloneapi/compiler/2021.1-beta03/linux/lib/x64/libOclCpuBackEnd.so.2019.9.11.0) by 0x20B49A18: llvm::vpo::VPRegionBlock::execute(llvm::vpo::VPTransformState*) (in /opt/intel/inteloneapi/compiler/2021.1-beta03/linux/lib/x64/libOclCpuBackEnd.so.2019.9.11.0) by 0x20B49A18: llvm::vpo::VPRegionBlock::execute(llvm::vpo::VPTransformState*) (in /opt/intel/inteloneapi/compiler/2021.1-beta03/linux/lib/x64/libOclCpuBackEnd.so.2019.9.11.0) by 0x20B47AAF: llvm::vpo::VPlan::execute(llvm::vpo::VPTransformState*) (in /opt/intel/inteloneapi/compiler/2021.1-beta03/linux/lib/x64/libOclCpuBackEnd.so.2019.9.11.0) by 0x20B3A639: llvm::vpo::LoopVectorizationPlanner::executeBestPlan(llvm::vpo::VPOCodeGen&) (in /opt/intel/inteloneapi/compiler/2021.1-beta03/linux/lib/x64/libOclCpuBackEnd.so.2019.9.11.0) by 0x20A69725: bool llvm::vpo::VPlanDriver::processLoop(llvm::Loop*, llvm::Function&, llvm::vpo::WRNVecLoopNode*) (in /opt/intel/inteloneapi/compiler/2021.1-beta03/linux/lib/x64/libOclCpuBackEnd.so.2019.9.11.0) The full output is attached.

Hi Savin,

AnubhavJ_intel — Wed, 15 Jan 2020 04:34:38 GMT

Hi Savin,

Thanks for reaching out to us. We are working on this issue and we'll get back to you soon.

Anubhav

Hi Savin,

AnubhavJ_intel — Wed, 15 Jan 2020 10:21:13 GMT

Hi Savin,

We are able to reproduce this Issue with cpu_selector as you mentioned. We are working on it.

Anubhav

Hi Anubhav,

Dmitry_Savin — Tue, 11 Feb 2020 18:27:36 GMT

Hi Anubhav, The issue is fixed in the beta04, checked on a local machine. As of the time of this comment (February 11th 2020) beta03 is used in the DevCloud. Can anybody explain what the issue was or point to the commit in the GitHub repo that fixed it? Dima

Hi Savin,

AnubhavJ_intel — Wed, 12 Feb 2020 14:57:20 GMT

Hi Savin,

Issue is fixed by Engineering team. We don't have much details on it.

Anubhav

Hi Anubhav,

Subarnarek_G_Intel — Thu, 13 Feb 2020 11:39:20 GMT

Hi Anubhav,

Please go ahead and close the ticket.

Regards,

Subarna

Hi Savin,

AnubhavJ_intel — Mon, 17 Feb 2020 08:16:33 GMT

Hi Savin,

Since Issue is fixed in the beta04 version, we are closing this thread. Please raise new threads for further Issues.

Anubhav

topic Hi Savin, in Intel® oneAPI DPC++/C++ Compiler

Segmentation fault with cpu_selector, works with default and gpu.

Hi Savin,

Hi Savin,

Hi Anubhav,

Hi Savin,

Hi Anubhav,

Hi Savin,